PYRACLOSTROBIN PRESERVES PHOTOSYNTHESIS IN ARABICA COFFEE PLANTS SUBJECTED TO WATER DEFICIT

Palavras-chave: Coffea arabica L., water stress, strobilurin, fluorescence of chlorophyll a, gas exchange

Resumo

The objective of this study was to investigate the effect of pyraclostrobin on the photosynthetic performance of rabica coffee plants subjected or not to a water deficit, using the parameter of gas exchange (net CO2 assimilation, stomatal conductance, transpiration rate, and internal CO2 concentration and nocturnal respiration), chlorophyll fluorescence a parameters (minimum fluorescence, maximum fluorescence, maximum quantum yield of photosystem II, effective quantum yield of PSII, quantum yield of regulated energy dissipation and quantum yield dissipation non-regulated) as well as the concentrations of chloroplast pigments. In the plants maintained without water deficit, pyraclostrobin did not cause any alteration on the parameters of chlorophyll a fluorescence; however, it contributed to an increase in the level of chlorophyll a + b, CO2 assimilation and CO2 influx for the carboxylation sites of the stroma. Decreases in nocturnal respiration in plants treated with pyraclostrobin, submitted or not to water deficit seems to be a common strategy in reducing energy waste in the maintenance metabolism. Under water deficit, pyraclostrobin contributed to increase the photochemical yield, enabling plants to effectively prevent the capture, use and dissipation of light energy.

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Biografia do Autor

Anelisa Figueiredo Peloso, Universidade Federal do Espírito SantoMestre em Produção Vegetal

Área: Fitotecnia

Sandro Dan Tatagiba, Instituto Federal de Educaçao, Ciência e Tecnologia do Pará.Professor Adjunto

Área: Fisiologia Vegetal

Francisco José Teixeira Amaral, Universidade Federal do Espírito SantoProfessor Adjunto

Área: Fitotecnia

Paulo César Cavatte, Universidade Federal do Espírito SantoProfessor Adjunto

Área: Fisiologia Vegetal

José Eduardo Macedo Pezzopane, Universidade Federal do Espírito SantoProfessor Adjunto

Área: Meteorologia Agrícola

Publicado
2020-02-07
Como Citar
Peloso, A. F., Tatagiba, S. D., Amaral, F. J. T., Cavatte, P. C., & Pezzopane, J. E. M. (2020). PYRACLOSTROBIN PRESERVES PHOTOSYNTHESIS IN ARABICA COFFEE PLANTS SUBJECTED TO WATER DEFICIT. REVISTA ENGENHARIA NA AGRICULTURA - REVENG, 28, 109-119. https://doi.org/10.13083/reveng.v28i.939
Seção
Recursos Hídricos e Ambientais