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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Impacts of warming and water deficit on antioxidant responses in Panicum maximum Jacq

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Autor(es):
Borjas-Ventura, Ricardo [1, 2] ; Alves, Leticia R. [1] ; de Oliveira, Reginaldo [1] ; Martinez, Carlos A. [3] ; Gratao, Priscila L. [1]
Número total de Autores: 5
Afiliação do(s) autor(es):
[1] Univ Estadual Paulista UNESP, Fac Ciencias Agr & Vet FCAV, Dept Biol Aplicada & Agr, Jaboticabal, SP - Brazil
[2] UNALM, Fac Agron, Dept Fitotecnia, Lima - Peru
[3] Univ Sao Paulo, FFCLRP, Dept Biol, Ribeirao Preto, SP - Brazil
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: PHYSIOLOGIA PLANTARUM; v. 165, n. 2, SI, p. 413-426, FEB 2019.
Citações Web of Science: 1
Resumo

Agricultural activities are affected by many biotic and abiotic stresses associated with global climate change. Predicting the response of plants to abiotic stress under future climate scenarios requires an understanding of plant biochemical performance in simulated stress conditions. In this study, the antioxidant response of Panicum maximum Jacq. cv. Mombaca exposed to warming (+2 degrees C above ambient temperature) (eT), water deficit (wS) and the combination eT + wS was analysed under field conditions using a temperature free-air-controlled enhancement facility. Warming was applied during the entire growth period. Data were collected at 13, 19 and 37 days after the start of the water deficit treatment (DAT) and at two sampling times (6:00 and 12:00 h). A significant decrease in chlorophyll was observed under the wS treatment, but an increment in total chlorophyll was observed in eT + wS, particularly at 19 DAT. Significant increase in H2O2 content, malondialdehyde and protein oxidation was observed in the wS treatment at noon of the third sampling. In the combined wS + eT stress treatment, the activity of the enzymatic antioxidant system increased, particularly of superoxide dismutase (SOD; EC 1.15.1.1) and ascorbate peroxidase (APX; EC 1.11.1.11). The chlorophyll fluorescence images showed that the photochemical performance was not significantly affected by the treatments. In conclusion, under simulated future warming and water stress conditions, the photosystem II (PSII) activity of P. maximum acclimated to moderate warming and a water-stressed environment associated with a relatively favourable antioxidant response, particularly in the activity of APX and SOD. (AU)

Processo FAPESP: 08/58075-8 - Miniface climate-change impact experiment to analyze the effects of elevated CO2 and warming on photosynthesis, gene expression, biochemistry, growth, nutrient dynamics and yield of two contrasting tropical forage species
Beneficiário:Carlos Alberto Martinez y Huaman
Linha de fomento: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Temático