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1.
J Environ Manage ; 367: 121979, 2024 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-39088904

RESUMEN

Cadmium (Cd) is readily absorbed by tobacco and accumulates in the human body through smoke inhalation, posing threat to human health. While there have been many studies on the negative impact of cadmium in tobacco on human health, the specific adaptive mechanism of tobacco roots to cadmium stress is not well understood. In order to comprehensively investigate the effects of Cd stress on the root system of tobacco, the combination of transcriptomic, biochemical, and physiological methods was utilized. In this study, tobacco growth was significantly inhibited by 50 µM of Cd, which was mainly attributed to the destruction of root cellular structure. By comparing the transcriptome between CK and Cd treatment, there were 3232 up-regulated deferentially expressed genes (DEGs) and 3278 down-regulated DEGs. The obvious differential expression of genes related to the nitrogen metabolism, metal transporters and the transcription factors families. In order to mitigate the harmful effects of Cd, the root system enhances Cd accumulation in the cell wall, thereby reducing the Cd content in the cytoplasm. This result may be mediated by plant hormones and transcription factor (TF). Correlational statistical analysis revealed significant negative correlations between IAA and GA with cadmium accumulation, indicated by correlation coefficients of -0.91 and -0.93, respectively. Conversely, ABA exhibited a positive correlation with a coefficient of 0.96. In addition, it was anticipated that 3 WRKY TFs would lead to a reduction in Cd accumulation. Our research provides a theoretical basis for the systematic study of the specific physiological processes of plant roots under Cd stress.


Asunto(s)
Cadmio , Reguladores del Crecimiento de las Plantas , Factores de Transcripción , Transcriptoma , Cadmio/toxicidad , Cadmio/metabolismo , Factores de Transcripción/metabolismo , Factores de Transcripción/genética , Transcriptoma/efectos de los fármacos , Reguladores del Crecimiento de las Plantas/metabolismo , Nicotiana/genética , Nicotiana/efectos de los fármacos , Estrés Fisiológico , Raíces de Plantas/efectos de los fármacos , Raíces de Plantas/metabolismo , Regulación de la Expresión Génica de las Plantas/efectos de los fármacos
3.
Sci Rep ; 14(1): 15047, 2024 07 01.
Artículo en Inglés | MEDLINE | ID: mdl-38951576

RESUMEN

Pink bollworm (PBW) Pectinophora gossypiella is an important pest cotton worldwide. There are multiple factors which determines the occurrence and distribution of P. gossypiella across different cotton growing regions of the world, and one such key factor is 'temperature'. The aim was to analyze the life history traits of PBW across varying temperature conditions. We systematically explored the biological and demographic parameters of P. gossypiella at five distinct temperatures; 20, 25, 30, 35 and 40 ± 1 °C maintaining a photoperiod of LD 16:8 h. The results revealed that the total developmental period of PBW shortens with rising temperatures, and the highest larval survival rates were observed between 30 °C and 35 °C, reaching 86.66% and 80.67%, respectively. Moreover, significant impacts were observed as the pupal weight, percent mating success, and fecundity exhibited higher values at 30 °C and 35 °C. Conversely, percent egg hatching, larval survival, and adult emergence were notably lower at 20 °C and 40 °C, respectively. Adult longevity decreased with rising temperatures, with females outliving males across all treatments. Notably, thermal stress had a persistent effect on the F1 generation, significantly affecting immature stages (egg and larvae), while its impact on reproductive potential was minimal. These findings offer valuable insights for predicting the population dynamics of P. gossypiella at the field level and developing climate-resilient management strategies in cotton.


Asunto(s)
Larva , Temperatura , Animales , Larva/fisiología , Femenino , Masculino , Gossypium/parasitología , Lepidópteros/fisiología , Lepidópteros/crecimiento & desarrollo , Fertilidad/fisiología , Mariposas Nocturnas/fisiología , Mariposas Nocturnas/crecimiento & desarrollo , Longevidad/fisiología , Pupa/fisiología , Pupa/crecimiento & desarrollo
4.
ACS Omega ; 9(28): 30478-30491, 2024 Jul 16.
Artículo en Inglés | MEDLINE | ID: mdl-39035905

RESUMEN

Drought is an inevitable environmental stress that drastically hampers the growth, productivity, and quality of food crops. Exogenous sodium nitroprusside and spermidine have decisive functions in the growth enhancement of plants; nevertheless, their specific role in mediating stress responses to improve drought tolerance in sunflowers at the reproductive stage (terminal drought) remains largely unknown. In the present study, we explored the positive effects of sodium nitroprusside and spermidine on physiological responses to increase in sunflower yield during periods of terminal drought. Initially, various doses (50, 100, 150, 200, 400 µM) for each sodium nitroprusside or spermidine were foliar sprayed to improve water content, chlorophylls, and biomass accumulation in sunflower seedlings under control (100% FC) and drought (60% FC) conditions. Optimized rates (100 µM for sodium nitroprusside) and (100 µM for spermidine) were further tested alone and in combination to assess drought tolerance potential and their ultimate impact on yield under drought stress. Drought exposure caused a marked reduction in relative water content (26%) and chlorophyll a (31%) and b (35%) contents; however, sodium nitroprusside and spermidine at 100 µM significantly improved the growth of sunflower (13%). Furthermore, combined use of sodium nitroprusside and spermidine at 100 + 100 µM markedly improved the achenes per head (16%), 1000-achene weight (14%), and ultimately grain (28%) and oil (21%) yields of sunflowers under drought stress. A strong association was found between the 1000-achene weight and the achene yield of sunflower. Hence, combined sodium nitroprusside and spermidine upregulate water balance and chlorophyll contents to increase sunflower yield under terminal drought.

5.
Sci Rep ; 14(1): 16481, 2024 Jul 17.
Artículo en Inglés | MEDLINE | ID: mdl-39013936

RESUMEN

Silver-zinc-nickel spinel ferrite was prepared by the co-precipitation procedure with the precise composition Ag0.1Zn0.4Ni0.5Fe2O4 for bolstering pollutant removal effectiveness while upholding magnetic properties and then coated with a mesoporous silica layer. The surface characteristics and composition of Ag0.1Zn0.4Ni0.5Fe2O4@mSiO2 were confirmed using EDX, FT-IR, VSM, XRD, TEM, SEM, and BET methods. The surface modification of Ag-Zn-Ni ferrite with a silica layer improves the texture properties, where the specific surface area and average pore size of the spinel ferrite rose to 180 m2/g and 3.15 nm, respectively. The prepared spinel ferrite@mSiO2 has been utilized as an efficient adsorbent for eliminating methyl green (MG) and indigo carmine (IC) as models of cationic and anionic dyes from wastewater, respectively. Studying pH, Pzc, adsorbent dosage, dye concentration, and temperature showed that efficient removal of MG was carried out in alkaline media (pH = 12), while the acid medium (pH = 2) was effective for IC removal. Langmuir isotherm and pseudo-second-order kinetics were found to be good fits for the adsorption data. Both dyes were adsorbed in a spontaneous, endothermic process. A possible mechanism for dye removal has been proposed. The adsorbent was effectively recovered and reused.

6.
Plant Physiol Biochem ; 215: 108977, 2024 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-39084167

RESUMEN

Silicon (Si) can significantly improve the salt tolerance of plants, but its mechanism remains unclear. In this study, role of abscisic acid (ABA) in Si derived salt resistance in tobacco seedling was investigated. Under salt stress, the photosynthetic rate, stomatal conductance, and transpiration rate of tobacco seedlings were reduced by 86.17%, 80.63%, and 67.54% respectively, resulting in a decrease in biomass. The application of Si found to mitigate these stress-induced markers. However, positive role of Si was mainly attributed to the enhanced expression of aquaporin genes, which helped in enhancing root hydraulic conductance (Lpr) and ultimately maintaining the leaf relative water content (RWC). Moreover, sodium tungstate, an ABA biosynthesis inhibitor, was used to test the role of ABA on Si-regulating Lpr. The results indicated that the improvement of Lpr by Si was diminished in the presence of ABA inhibitor. In addition, it was observed that the ABA content was increased due to the Si-upregulated of ABA biosynthesis genes, namely NtNCED1 and NtNCED5. Conversely, the expression of ABA metabolism gene NtCYP7O7A was found to be reduced by Si. Together, this study suggested that Si increased ABA content, leading to enhanced efficiency of water uptake by the roots, ultimately facilitating an adequate water supply to maintain leaf water balance. As a result, there was an improvement in salt resistance in tobacco seedling.


Asunto(s)
Ácido Abscísico , Acuaporinas , Regulación de la Expresión Génica de las Plantas , Nicotiana , Tolerancia a la Sal , Silicio , Nicotiana/metabolismo , Nicotiana/genética , Nicotiana/efectos de los fármacos , Ácido Abscísico/metabolismo , Silicio/farmacología , Silicio/metabolismo , Acuaporinas/metabolismo , Acuaporinas/genética , Tolerancia a la Sal/genética , Regulación de la Expresión Génica de las Plantas/efectos de los fármacos , Proteínas de Plantas/metabolismo , Proteínas de Plantas/genética , Plantones/metabolismo , Plantones/efectos de los fármacos , Plantones/genética , Raíces de Plantas/metabolismo , Raíces de Plantas/efectos de los fármacos , Hojas de la Planta/metabolismo , Hojas de la Planta/efectos de los fármacos
7.
J Hazard Mater ; 476: 134905, 2024 Sep 05.
Artículo en Inglés | MEDLINE | ID: mdl-38941827

RESUMEN

Numerous studies shown that silicon (Si) enhanced plants' resistance to cadmium (Cd). Most studies primarily focused on investigating the impact of Si on Cd accumulation. However, there is a lack of how Si enhanced Cd resistance through regulation of water balance. The study demonstrated that Si had a greater impact on increasing fresh weight compared to dry weight under Cd stress. This effect was mainly attributed to Si enhanced plant relative water content (RWC). Plant water content depends on the dynamic balance of water loss and water uptake. Our findings revealed that Si increased transpiration rate and stomatal conductance, leading to higher water loss. This, in turn, negatively impacted water content. The increased water content caused by Si could ascribe to improve root water uptake. The Si treatment significantly increased root hydraulic conductance (Lpr) by 131 % under Cd stress. This enhancement was attributed to Si upregulation genes expression of NtPIP1;1, NtPIP1;2, NtPIP1;3, and NtPIP2;1. Through meticulously designed scientific experiments, this study showed that Si enhanced AQP activity, leading to increased water content that diluted Cd concentration and ultimately improved plant Cd resistance. These findings offered fresh insights into the role of Si in bolstering plant resistance to Cd.


Asunto(s)
Acuaporinas , Cadmio , Nicotiana , Raíces de Plantas , Plantones , Silicio , Agua , Cadmio/toxicidad , Silicio/farmacología , Silicio/química , Raíces de Plantas/metabolismo , Raíces de Plantas/efectos de los fármacos , Plantones/efectos de los fármacos , Plantones/metabolismo , Nicotiana/efectos de los fármacos , Nicotiana/metabolismo , Acuaporinas/metabolismo , Agua/química , Proteínas de Plantas/metabolismo , Regulación de la Expresión Génica de las Plantas/efectos de los fármacos , Transpiración de Plantas/efectos de los fármacos
8.
Ecotoxicol Environ Saf ; 281: 116596, 2024 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-38896899

RESUMEN

Cadmium (Cd), which accumulates in tobacco leaves, enters the human body through inhalation of smoke, causing harmful effects on health. Therefore, identifying the pivotal factors that govern the absorption and resistance of Cd in tobacco is crucial for mitigating the harmful impact of Cd. In the present study, four different Cd-sensitive varieties, namely, ZhongChuan208 (ZC) with resistance, ZhongYan100 (ZY), K326 with moderate resistance, and YunYan87 (YY) with sensitivity, were cultivated in hydroponic with different Cd concentrations (20 µM, 40 µM, 60 µM and 80 µM). The results indicated that plant growth was significantly decreased by Cd. Irrespective of the Cd concentration, ZC exhibited the highest biomass, while YY had the lowest biomass; ZY and K326 showed intermediate levels. Enzymatic (APX, CAT, POD) and nonenzymatic antioxidant (Pro, GSH) systems showed notable variations among varieties. The multifactor analysis suggested that the ZC and ZY varieties, with higher levels of Pro and GSH content, contribute to a decrease in the levels of MDA and ROS. Among all the Cd concentrations, ZC exhibited the lowest Cd accumulation, while YY showed the highest. Additionally, there were significant differences observed in Cd distribution and translocation factors among the four different varieties. In terms of Cd distribution, cell wall Cd accounted for the highest proportion of total Cd, and organelles had the lowest proportion. Among the varieties, ZC showed lower Cd levels in the cell wall, soluble fraction, and organelles. Conversely, YY exhibited the highest Cd accumulation in all tissues; K326 and ZY had intermediate levels. Translocation factors (TF) varied among the varieties under Cd stress, with ZC and ZY showing lower TF compared to YY and K326. This phenomenon mainly attributed to regulation of the NtNramp3 and NtNramp5 genes, which are responsible for the absorption and transport of Cd. This study provides a theoretical foundation for the selection and breeding of tobacco varieties that are resistant to or accumulate less Cd.


Asunto(s)
Nicotiana , Nicotiana/química , Nicotiana/genética , Nicotiana/crecimiento & desarrollo , Nicotiana/metabolismo , Cadmio/toxicidad , Resistencia a Medicamentos , Regulación de la Expresión Génica de las Plantas/efectos de los fármacos , Estrés Fisiológico/efectos de los fármacos , Antioxidantes/metabolismo , Proteínas de Transporte de Catión/metabolismo
9.
Heliyon ; 10(10): e30929, 2024 May 30.
Artículo en Inglés | MEDLINE | ID: mdl-38765047

RESUMEN

Among the range of severe plant diseases, bacterial soft rot caused by Erwinia carotovora is a significant threat to crops. This study aimed to examine the varying response patterns of distinct potato cultivars to the influence of E. carotovora. Furthermore, it seeks to highlight the potential role of salicylic acid (SA) and methyl jasmonate (MeJA) in stimulating the antioxidant defence system. We collected eight bacterial isolates from diseased and rotted tubers which were morphologically and physiologically identified as E. carotovora subsp. carotovora. We conducted a greenhouse experiment to analyse the antioxidant responses of three different potato cultivars (Diamont, Kara, and Karros) at various time intervals (2, 4, 6, 8, 12, and 24 h) after bacterial infection (hpi). We assessed the extent of disease damage by applying a foliar spray of 0.9 mM salicylic acid (SA) and 70 µM methyl jasmonate (MeJA). Inoculating with Ecc led to an increase in total phenolic levels, as well as the activities and gene expression of phenylalanine ammonia-lyase (PAL), polyphenol oxidase (PPO) and peroxidase (POX) as time progressed. Additionally, the application of SA and MeJA resulted in a further increase relative to the diseased treatments. The Karros cultivar, unlike the Diamont and Kara cultivars, demonstrated the highest expression levels of PAL, PPO and POX through inoculation, reflecting its higher levels of activity and resistance. Furthermore, the genetic response of potato cultivars to infection at 0 hpi varied depending on their susceptibility. The examination of the rate of PAL activity upregulation following SA or MeJA stimulation clarifies the cultivars' susceptibility over time. In conclusion, the study identified E. carotovora subsp. carotovora as the most virulent isolate causing soft rot disease in potato tubers. It further revealed that the Karros cultivar displayed superior resistance with high activities and gene expression of PAL, PPO and POX, while the cv. Diamont exhibited sensitivity. Additionally, foliar exposure to SA and MeJA induced antioxidant responses, enhancing the potato plants' resistance against Ecc pathogenesis and overall plant defence.

10.
BMC Genom Data ; 25(1): 40, 2024 May 09.
Artículo en Inglés | MEDLINE | ID: mdl-38724915

RESUMEN

Bulb rot, a highly damaging disease of tulip plants, has hindered their profitable cultivation worldwide. This rot occurs in both field and storage conditions posing significant challenges. While this disease has been attributed to a range of pathogens, previous investigations have solely examined it within the framework of a single-pathogen disease model. Our study took a different approach and identified four pathogens associated with the disease: Fusarium solani, Penicillium chrysogenum, Botrytis tulipae, and Aspergillus niger. The primary objective of our research was to examine the impact of co-infections on the overall virulence dynamics of these pathogens. Through co-inoculation experiments on potato dextrose agar, we delineated three primary interaction patterns: antibiosis, deadlock, and merging. In vitro trials involving individual pathogen inoculations on tulip bulbs revealed that B. tulipae,was the most virulent and induced complete bulb decay. Nonetheless, when these pathogens were simultaneously introduced in various combinations, outcomes ranged from partial bulb decay to elongated rotting periods. This indicated a notable degree of antagonistic behaviour among the pathogens. While synergistic interactions were evident in a few combinations, antagonism overwhelmingly prevailed. The complex interplay of these pathogens during co-infection led to a noticeable change in the overall severity of the disease. This underscores the significance of pathogen-pathogen interactions in the realm of plant pathology, opening new insights for understanding and managing tulip bulb rot.


Asunto(s)
Fusarium , Enfermedades de las Plantas , Tulipa , Enfermedades de las Plantas/microbiología , Fusarium/patogenicidad , Tulipa/microbiología , Botrytis/patogenicidad , Penicillium chrysogenum/patogenicidad , Aspergillus niger/patogenicidad , Virulencia , Raíces de Plantas/microbiología
11.
Heliyon ; 10(9): e30473, 2024 May 15.
Artículo en Inglés | MEDLINE | ID: mdl-38711638

RESUMEN

The designing of acceptors materials for the organic solar cells is a hot topic. The normal experimental methods are tedious and expensive for large screening. Machine learning guided exploration is more suitable solution. Bagging regression, random forest regression, gradient boosting regression, and linear regression are trained to predict exciton binding energy. Breaking Retrosynthetically Interesting Chemical Substructures (BRICS) methodology has utilized for designing of new non-fullerene acceptors (NFAs). The predicted values were used to select the designed NFAs. On the selected NFAs, clustering and chemical similarity analyses are also performed. Chemical fingerprints are used for this purpose, and the synthetic accessibility score of the new NFAs is also investigated.30 NFAs have selected with low exciton binding energy values. This approach will allow for the rapid screening of NFAs for organic solar cells. Our proposed framework stands out as a valuable tool for strategically selecting the most effective NFAs for organic solar cells and offers a streamlined approach for material discovery.

12.
Environ Pollut ; 350: 123952, 2024 Jun 01.
Artículo en Inglés | MEDLINE | ID: mdl-38641035

RESUMEN

The adversities of cadmium (Cd) contamination are quite distinguished among other heavy metals (HMs), and so is the efficacy of zinc (Zn) nutrition in mitigating Cd toxicity. Rice (Oryza sativa) crop, known for its ability to absorb HMs, inadvertently facilitates the bioaccumulation of Cd, posing a significant risk to both the plant itself and to humans consuming its edible parts, and damaging the environment as well. The use of nanoparticles, such as nano-zinc oxide (nZnO), to improve the nutritional quality of crops and combat the harmful effects of HMs, have gained substantial attention among scientists and farmers. While previous studies have explored the individual effects of nZnO or Serendipita indica (referred to as S.i) on Cd toxicity, the synergistic action of these two agents has not been thoroughly investigated. Therefore, the gift of nature, i.e., S. indica, was incorporated alongside nZnO (50 mg L-1) against Cd stress (15 µM L-1) and their alliance manifested as phenotypic level modifications in two rice genotypes (Heizhan43; Hz43 and Yinni801; Yi801). Antioxidant activities were enhanced, specifically peroxidase (61.5 and 122.5% in Yi801 and Hz43 roots, respectively), leading to a significant decrease in oxidative burst; moreover, Cd translocation was reduced (85% for Yi801 and 65.5% for Hz43 compared to Cd alone treatment). Microstructural study showed a decrease in number of vacuoles and starch granules with ameliorative treatments. Overall, plants treated with nZnO displayed gene expression pattern (particularly of ZIP genes), different from the ones with alone or combined S.i and Cd. Inferentially, the integration of nZnO and S.i holds great promise as an effective strategy for alleviating Cd toxicity in rice plants. By immobilizing Cd ions in the soil and promoting their detoxification, this novel approach contributes to environmental restoration and ensures food safety worldwide.


Asunto(s)
Antioxidantes , Cadmio , Oryza , Contaminantes del Suelo , Oryza/genética , Oryza/metabolismo , Cadmio/toxicidad , Antioxidantes/metabolismo , Contaminantes del Suelo/toxicidad , Zinc/toxicidad , Óxido de Zinc/toxicidad , Óxido de Zinc/farmacología , Nanopartículas del Metal/toxicidad
13.
J Immunol ; 212(12): 1922-1931, 2024 Jun 15.
Artículo en Inglés | MEDLINE | ID: mdl-38683124

RESUMEN

Although high titers of neutralizing Abs in human serum are associated with protection from reinfection by SARS-CoV-2, there is considerable heterogeneity in human serum-neutralizing Abs against SARS-CoV-2 during convalescence between individuals. Standard human serum live virus neutralization assays require inactivation of serum/plasma prior to testing. In this study, we report that the SARS-CoV-2 neutralization titers of human convalescent sera were relatively consistent across all disease states except for severe COVID-19, which yielded significantly higher neutralization titers. Furthermore, we show that heat inactivation of human serum significantly lowered neutralization activity in a live virus SARS-CoV-2 neutralization assay. Heat inactivation of human convalescent serum was shown to inactivate complement proteins, and the contribution of complement in SARS-CoV-2 neutralization was often >50% of the neutralizing activity of human sera without heat inactivation and could account for neutralizing activity when standard titers were zero after heat inactivation. This effect was also observed in COVID-19 vaccinees and could be abolished in individuals who were undergoing treatment with therapeutic anti-complement Abs. Complement activity was mainly dependent on the classical pathway with little contributions from mannose-binding lectin and alternative pathways. Our study demonstrates the importance of the complement pathway in significantly increasing viral neutralization activity against SARS-CoV-2 in spike seropositive individuals.


Asunto(s)
Anticuerpos Neutralizantes , Anticuerpos Antivirales , Vacunas contra la COVID-19 , COVID-19 , Vía Clásica del Complemento , Pruebas de Neutralización , SARS-CoV-2 , Humanos , SARS-CoV-2/inmunología , Anticuerpos Neutralizantes/inmunología , Anticuerpos Neutralizantes/sangre , COVID-19/inmunología , Anticuerpos Antivirales/inmunología , Anticuerpos Antivirales/sangre , Vía Clásica del Complemento/inmunología , Vacunas contra la COVID-19/inmunología , Masculino , Femenino , Persona de Mediana Edad , Adulto , Convalecencia , Anciano , Proteínas del Sistema Complemento/inmunología
14.
Plant Physiol Biochem ; 211: 108639, 2024 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-38688113

RESUMEN

Melatonin (MT) is an extensively studied biomolecule with dual functions, serving as an antioxidant and a signaling molecule. Trichoderma Harzianum (TH) is widely recognized for its effectiveness as a biocontrol agent against many plant pathogens. However, the interplay between seed priming and MT (150 µm) in response to NaCl (100 mM) and its interaction with TH have rarely been investigated. This study aimed to evaluate the potential of MT and TH, alone and in combination, to mitigate salt stress (SS) in watermelon plants. The findings of this study revealed a significant decline in the morphological, physiological, and biochemical indices of watermelon seedlings exposed to SS. However, MT and TH treatments reduced the negative impact of salt stress. The combined application of MT and TH exerted a remarkable positive effect by increasing the growth, photosynthetic and gas exchange parameters, chlorophyll fluorescence indices, and ion balance (decreasing Na+ and enhancing K+). MT and TH effectively alleviated oxidative injury by inhibiting hydrogen peroxide formation in saline and non-saline environments, as established by reduced lipid peroxidation and electrolyte leakage. Moreover, oxidative injury induced by SS on the cells was significantly mitigated by regulation of the antioxidant system, AsA-GSH-related enzymes, the glyoxalase system, augmentation of osmolytes, and activation of several genes involved in the defense system. Additionally, the reduction in oxidative damage was examined by chloroplast integrity via transmission electron microscopy (TEM). Overall, the results of this study provide a promising contribution of MT and TH in safeguarding the watermelon crop from oxidative damage induced by salt stress.


Asunto(s)
Antioxidantes , Citrullus , Regulación de la Expresión Génica de las Plantas , Melatonina , Hojas de la Planta , Citrullus/microbiología , Citrullus/efectos de los fármacos , Citrullus/metabolismo , Melatonina/farmacología , Antioxidantes/metabolismo , Hojas de la Planta/efectos de los fármacos , Hojas de la Planta/metabolismo , Regulación de la Expresión Génica de las Plantas/efectos de los fármacos , Estrés Salino , Hypocreales , Fotosíntesis/efectos de los fármacos , Estrés Oxidativo/efectos de los fármacos
15.
Ecotoxicol Environ Saf ; 274: 116181, 2024 Apr 01.
Artículo en Inglés | MEDLINE | ID: mdl-38460406

RESUMEN

The emergence of polyvinyl chloride (PVC) microplastics (MPs) as pollutants in agricultural soils is increasingly alarming, presenting significant toxic threats to soil ecosystems. Ajwain (Trachyspermum ammi L.), a plant of significant medicinal and culinary value, is increasingly subjected to environmental stressors that threaten its growth and productivity. This situation is particularly acute given the well-documented toxicity of chromium (Cr), which has been shown to adversely affect plant biomass and escalate risks to the productivity of such economically and therapeutically important species. The present study was conducted to investigate the individual effects of different levels of PVC-MPs (0, 2, and 4 mg L-1) and Cr (0, 150, and 300 mg kg-1) on various aspects of plant growth. Specifically, we examined growth and biomass, photosynthetic pigments, gas exchange attributes, oxidative stress responses, antioxidant compound activity (both enzymatic and nonenzymatic), gene expression, sugar content, nutritional status, organic acid exudation, and Cr accumulation in different parts of Ajwain (Trachyspermum ammi L.) seedlings, which were also exposed to varying levels of titanium dioxide (TiO2) nanoparticles (NPs) (0, 25, and 50 µg mL-1). Results from the present study showed that the increasing levels of Cr and PVC-MPs in soils significantly decreased plant growth and biomass, photosynthetic pigments, gas exchange attributes, sugars, and nutritional contents from the roots and shoots of the plants. Conversely, increasing levels of Cr and PVC-MPs in the soil increased oxidative stress indicators in term of malondialdehyde, hydrogen peroxide, and electrolyte leakage, and also increased organic acid exudation pattern in the roots of T. ammi seedlings. Interestingly, the application of TiO2-NPs counteracted the toxicity of Cr and PVC-MPs in T. ammi seedlings, leading to greater growth and biomass. This protective effect is facilitated by the NPs' ability to sequester reactive oxygen species, thereby reducing oxidative stress and lowering Cr concentrations in both the roots and shoots of the plants. Our research findings indicated that the application of TiO2-NPs has been shown to enhance the resilience of T. ammi seedlings to Cr and PVC-MPs toxicity, leading to not only improved biomass but also a healthier physiological state of the plants. This was demonstrated by a more balanced exudation of organic acids, which is a critical response mechanism to metal stress.


Asunto(s)
Ammi , Contaminantes del Suelo , Titanio , Antioxidantes/metabolismo , Ammi/metabolismo , Microplásticos/metabolismo , Plásticos/metabolismo , Cromo/análisis , Ecosistema , Estrés Oxidativo , Suelo , Expresión Génica , Contaminantes del Suelo/análisis
16.
J Environ Manage ; 356: 120673, 2024 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-38508003

RESUMEN

Microplastics (MPs) accumulation in terrestrial ecosystems can affect greenhouse gases (GHGs) production by altering microbial and soil structure. Presently, research on the MPs effect on plants is not consistent, and underlying molecular mechanisms associated with GHGs are yet unknown. For the first time, we conducted a microcosm study to explore the impact of MPs addition (Raw vs. aged) and Trichoderma longibrachiatum and Bacillus subtilis inoculation (Sole vs. combination) on GHGs emission, soil community structure, physiochemical properties, and enzyme activities. Our results indicated that the addition of aged MPs considerably enhanced the GHGs emissions (N2O (+16%) and CO2 (+21%), respectively), C and N cycling gene expression, microbial biomass carbon, and soil physiochemical properties than raw MPs. However, the soil microbial community structure and enzyme activities were enhanced in raw MPs added treatments, irrespective of the MPs type added to soil. However, microbial inoculation significantly reduced GHGs emission by altering the expression of C and N cycling genes in both types of MPs added treatments. The soil microbial community structure, enzymes activities, physiochemical properties and microbial biomass carbon were enhanced in the presence of microbial inoculation in both type of MPs. Among sole and combined inoculation of Trichoderma and Bacillus subtilis, the co-applied Trichoderma and Bacillus subtilis considerably reduced the GHGs emission (N2O (-64%) and CO2 (-61%), respectively) by altering the expression of C and N cycling genes regardless of MPs type used. The combined inoculation also enhanced soil enzyme activities, microbial community structure, physiochemical properties and microbial biomass carbon in both types of MPs treatment. Our findings provide evidence that polyethylene MPs likely pose a high risk of GHGs emission while combined application of Trichoderma and Bacillus subtilis significantly reduced GHGs emission by altering C and N cycling gene expression, soil microbial community structure, and enzyme activities under MPs pollution in a terrestrial ecosystem.


Asunto(s)
Gases de Efecto Invernadero , Microbiota , Gases de Efecto Invernadero/análisis , Suelo/química , Microplásticos , Plásticos , Dióxido de Carbono/análisis , Carbono , Bacterias , Óxido Nitroso/análisis
17.
Mucosal Immunol ; 17(2): 201-210, 2024 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-38278415

RESUMEN

Our understanding of the quality of cellular and humoral immunity conferred by COVID-19 vaccination alone versus vaccination plus SARS-CoV-2 breakthrough (BT) infection remains incomplete. While the current (2023) SARS-CoV-2 immune landscape of Canadians is complex, in late 2021 most Canadians had either just received a third dose of COVID-19 vaccine, or had received their two-dose primary series and then experienced an Omicron BT. Herein we took advantage of this coincident timing to contrast cellular and humoral immunity conferred by three doses of vaccine versus two doses plus BT. Our results show thatBT infection induces cell-mediated immune responses to variants comparable to an intramuscular vaccine booster dose. In contrast, BT subjects had higher salivary immunoglobulin (Ig)G and IgA levels against the Omicron spike and enhanced reactivity to the ancestral spike for the IgA isotype, which also reacted with SARS-CoV-1. Serumneutralizing antibody levels against the ancestral strain and the variants were also higher after BT infection. Our results support the need for the development of intranasal vaccines that could emulate the enhanced mucosal and humoral immunity induced by Omicron BT without exposing individuals to the risks associated with SARS-CoV-2 infection.


Asunto(s)
COVID-19 , Pueblos de América del Norte , SARS-CoV-2 , Humanos , Anticuerpos Neutralizantes , Anticuerpos Antivirales , Infección Irruptiva , Canadá , Vacunas contra la COVID-19 , Inmunidad Humoral , Inmunoglobulina A Secretora , Inmunoglobulina G
18.
Phys Occup Ther Pediatr ; 44(3): 295-315, 2024.
Artículo en Inglés | MEDLINE | ID: mdl-37867325

RESUMEN

AIM: To assess the effectiveness of interventions aimed at facilitating the transition from full tube to independent oral feeds in premature infants. METHODS: Scoping review methodology using the Preferred Reporting items for Systematic Reviews and Meta-Analyses Extension for Scoping Reviews (PRISMA_ScR). A search of six databases (EMBASE, MEDLINE, CINAHL, Web of Science, COCHRANE, and OT Seeker), using keywords related to oral feeding and premature infants retrieved 11,870 articles. Full-text screening was completed for 36 articles, and 21 articles were included in this review. RESULTS: Review of the 21 articles revealed five intervention types: oral stimulation (n = 14), swallow/gustatory stimulation (n = 3), olfactory stimulation (n = 2), tactile/kinesthetic stimulation (n = 1), and auditory stimulation (n = 1). Oral stimulation had the most studies with consistent evidence supporting its beneficial effect to facilitate achievement to independent oral feeds, swallow/gustatory stimulation appeared to have some benefit, but evidence for olfactory, tactile/kinesthetic, and auditory stimulation was sparse. CONCLUSION: Oral stimulation has the most studies with consistent evidence, and thus is suggested as a suitable early intervention strategy that can be used by health providers to facilitate the achievement to independent oral feeds in premature infants. The alternate forms of stimulation have limited evidence and necessitate further studies to confirm their benefits.


Asunto(s)
Recien Nacido Prematuro , Conducta en la Lactancia , Recién Nacido , Humanos , Recien Nacido Prematuro/fisiología , Intervención Educativa Precoz
19.
J Plast Reconstr Aesthet Surg ; 88: 47-50, 2024 01.
Artículo en Inglés | MEDLINE | ID: mdl-37952435

RESUMEN

BACKGROUND: The study was an analysis of patients managed by plastic surgery services at Heatherwood and Wexham Park hospitals during the calendar year 2022 for complications following cosmetic surgeries performed both internationally and within the United Kingdom. METHODS: Patients were identified via local databases and encounters and management confirmed with retrospective studies of patient electronic medical records. RESULTS: 23 patients were managed during the year 2022 for complications post cosmetic surgery. 91% (n = 21) of complications were related to breast cosmetic surgery and/or abdominoplasties. 78% (n = 18) of patients presented within the first two months following their procedure. The most common complications identified were wound dehiscence 43% (n = 10), post-operative infection 39% (n = 9) and seromas 30% (n = 7). The most common country selected for surgery by patients was Turkey with 48% (n = 11) of managed patients. 52% (n = 12) of cases were managed conservatively and 48% (n = 11) of cases required invasive procedures including surgery. 87% (n = 20) of patients were discharged with completed treatment. CONCLUSION: Cosmetic surgery and tourism are an in-demand phenomenon and appear here to stay. The stringent regulatory and legal processes in place in the UK may not be applicable abroad to the detriment of patient care. Greater effort is needed to increase public awareness to the risks involved in seeking international options and how to self-screen suitable clinics. Ongoing current national auditing may need to be expanded to understand the true impact on NHS units in dealing with the aftermath of these surgical expeditions.


Asunto(s)
COVID-19 , Turismo Médico , Cirugía Plástica , Humanos , Cirugía Plástica/efectos adversos , Estudios Retrospectivos , Pandemias , Medicina Estatal , COVID-19/epidemiología , COVID-19/complicaciones , Complicaciones Posoperatorias/epidemiología , Complicaciones Posoperatorias/etiología , Complicaciones Posoperatorias/terapia
20.
Plants (Basel) ; 12(23)2023 Nov 28.
Artículo en Inglés | MEDLINE | ID: mdl-38068633

RESUMEN

Bottle gourd (Lagenaria siceraria) is a well-known cucurbit with an active functional ingredient. A two-year field experiment was carried out at the Research Farm of Seed Science and Technology, CCS HAU, Hisar, in a randomized block design during the Kharif season (Kharif is one of the two major cropping seasons in India and other South Asian countries, heavily reliant on monsoon rains with the other being Rabi) and the summer season. Five different crossing periods (CP), viz. CP1, CP2, CP3, CP4, and CP5, were considered to illustrate the effects of agro-climatic conditions on the quality and biochemical components of two bottle gourd parental lines and one hybrid, HBGH-35. The average mean temperature for the Kharif season in 2017 was 31.7 °C, and for the summer season, it was 40.1 °C. Flowers were tagged weekly from the start of the crossing period until the end and harvested separately at different times. The fruits harvested from different crossing periods under different environmental conditions influenced the bottle gourd's qualitative and biochemical traits and showed significant variations among the five crossing period environments. A positive significance and correlation were observed between weather variables and different biochemical characteristics. Henceforth, the CP4 crossing period at a temperature of 31.7 °C retained high-quality seed development, which may be essential in enhancing agricultural productivity and the national economy.

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