Enhancement of salt tolerance in corn using Azospirillum brasilense: an approach on antioxidant systems.

Checchio, Mirela Vantini; de Cássia Alves, Rita; de Oliveira, Kevein Ruas; Moro, Gustavo Vitti; Santos, Durvalina Maria Mathias Dos; Gratão, Priscila Lupino

Checchio, Mirela Vantini; de Cássia Alves, Rita; de Oliveira, Kevein Ruas; Moro, Gustavo Vitti; Santos, Durvalina Maria Mathias Dos; Gratão, Priscila Lupino.

Afiliação

Checchio MV; Universidade Estadual Paulista (UNESP), Faculdade de Ciências Agrárias e Veterinárias, Depto. de Biologia Aplicada à Agropecuária, Jaboticabal, SP, 14884-900, Brazil.
de Cássia Alves R; Núcleo de Produção Vegetal, Instituto Nacional do Semiárido (INSA), Campina Grande, PB, 58434-700, Brazil.
de Oliveira KR; Universidade Estadual Paulista (UNESP), Faculdade de Ciências Agrárias e Veterinárias, Depto. de Biologia Aplicada à Agropecuária, Jaboticabal, SP, 14884-900, Brazil.
Moro GV; Universidade Estadual Paulista (UNESP), Faculdade de Ciências Agrárias e Veterinárias, Depto. de Produção Vegetal, Jaboticabal, SP, 14884-900, Brazil.
Santos DMMD; Universidade Estadual Paulista (UNESP), Faculdade de Ciências Agrárias e Veterinárias, Depto. de Biologia Aplicada à Agropecuária, Jaboticabal, SP, 14884-900, Brazil.
Gratão PL; Universidade Estadual Paulista (UNESP), Faculdade de Ciências Agrárias e Veterinárias, Depto. de Biologia Aplicada à Agropecuária, Jaboticabal, SP, 14884-900, Brazil. pl.gratao@unesp.br.

J Plant Res ; 134(6): 1279-1289, 2021 Nov.

Article em En | MEDLINE | ID: mdl-34302571

RESUMO

Salinity has become one of the major factors limiting agricultural production. In this regard, different cost-effective management strategies such as the use of plant growth-promoting bacteria (PGPB) as inoculants to alleviate salt-stress conditions and minimize plant productivity losses have been used in agricultural systems. The aim of this study was to characterize induced antioxidant responses in corn through inoculation with Azospirillum brasilense and examine the relationship between these responses and the acquired salt-stress tolerance. Treatments were performed by combining sodium chloride (0 and 100 mM NaCl) through irrigation water with absence and presence of A. brasilense inoculation. The experiment was performed in a completely randomized design with four replications. Lipid peroxidation (malondialdehyde [MDA]), and nitrogen (N), sodium (Na+) and potassium (K+) contents, as well as dry biomass, glycine betaine, and antioxidant enzymes activities such as of superoxide dismutase (SOD, EC 1. 15. 1. 1), glutathione reductase (GR, EC 1. 6. 4. 2), guaiacol peroxidase (GPOX, EC 1. 11. 1. 7), and glutathione peroxidase (GSH-PX, EC 1. 11. 1. 9) were determined. Overall results indicated that plants treated with 100 mM NaCl showed the most pronounced salt-stress damages with consequent increase in MDA content. However, inoculated plants showed an enhanced capacity to withstand or avoid salt-stress damages. These results could be attributed, at least in part, to the increased activity of antioxidant enzymes. Our results suggest that A. brasilense may confer tolerance to salt stress in corn plants enhancing antioxidant responses, primarily by the enzymes GSH-PX and GPOX, and the osmolyte glycine betaine.

Assuntos

Antioxidantes; Azospirillum brasilense; Malondialdeído; Estresse Oxidativo; Salinidade; Tolerância ao Sal; Zea mays

Palavras-chave

Alleviate; Antioxidant enzymes; Growth-promoting bacteria; Oxidative stress; Salinity

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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Azospirillum brasilense / Antioxidantes Tipo de estudo: Clinical_trials País/Região como assunto: America do sul / Brasil Idioma: En Revista: J Plant Res Assunto da revista: BOTANICA Ano de publicação: 2021 Tipo de documento: Article País de afiliação: Brasil País de publicação: Japão

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