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Understanding desiccation tolerance and sex-specific responses in Bryum argenteum: insights from phenological phases and physiological analyses.
Dos Santos, Wagner Luiz; Medina-Ramos, Andrea; Greenwood, Joshua; Pôrto, Kátia Cavalcanti; Pinheiro, Fábio; Stark, Lloyd R.
Afiliación
  • Dos Santos WL; Graduate Program in Ecology, Biology Institute, Department of Plant Biology, Universidade Estadual de Campinas, Monteiro Lobato 255, Campinas, SP 13083-862, Brazil.
  • Medina-Ramos A; School of Life Sciences, University of Nevada, 4505 Maryland Parkway, Las Vegas, NV 89154-4004, USA.
  • Greenwood J; School of Life Sciences, University of Nevada, 4505 Maryland Parkway, Las Vegas, NV 89154-4004, USA.
  • Pôrto KC; Biosciences Center, Department of Botany, Universidade Federal de Pernambuco, Moraes Rego Av., s/n, Recife, PE 50670-901, Brazil.
  • Pinheiro F; Graduate Program in Ecology, Biology Institute, Department of Plant Biology, Universidade Estadual de Campinas, Monteiro Lobato 255, Campinas, SP 13083-862, Brazil.
  • Stark LR; School of Life Sciences, University of Nevada, 4505 Maryland Parkway, Las Vegas, NV 89154-4004, USA.
Ann Bot ; 134(2): 351-364, 2024 Jul 09.
Article en En | MEDLINE | ID: mdl-38702965
ABSTRACT
BACKGROUND AND

AIMS:

Desiccation tolerance (DT) is crucial for survival in arid environments, where organisms develop strategies in reproduction, maintenance and defence to cope with water scarcity. Therefore, investigating the relationship between reproduction and DT is essential to understand the ecology and adaptive strategies of species. This study explores the connection between the development of male and female gametangia in the moss Bryum argenteum and the decrease in DT during the progression of phenological phases in gametangia and protonema.

METHODS:

Samples collected from a dry tropical forest in Brazil were cultivated, cloned and subjected to desiccation. Subsequently, the physiological parameters of shoots and protonemata were analysed. Shoot and protonema regeneration were monitored for 28 d after the physiological analyses. Both phases were subjected to control and desiccation treatments. KEY

RESULTS:

Significant effects of desiccation and sex on the physiological parameters and regeneration capacity of shoots and protonemata were found. Male shoots generally exhibited lower values of Fv/Fm (quantum efficiency of photosystem II) and ϕPSII (effective quantum yield of photosystem II), while females demonstrated higher values and better recovery after desiccation. Protonemata also showed variation in Fv/Fm over time and with sex, with no significant differences in ϕPSII between them. Desiccated male shoots had higher mortality rates and produced fewer new shoots. For females, the regeneration patterns varied between the desiccation-exposed groups and the control, with decreased shoot production, and some protonemata growing into filaments without forming shoots.

CONCLUSION:

These findings improve our understanding of the ecological responses of bryophytes to desiccation stress and provide insights into their adaptive strategies in challenging environments, such as the possible rarity of males in dioicous moss populations.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Desecación País/Región como asunto: America do sul / Brasil Idioma: En Revista: Ann Bot Año: 2024 Tipo del documento: Article País de afiliación: Brasil Pais de publicación: Reino Unido
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Desecación País/Región como asunto: America do sul / Brasil Idioma: En Revista: Ann Bot Año: 2024 Tipo del documento: Article País de afiliación: Brasil Pais de publicación: Reino Unido