Abstract
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.
Highlights
The production of coffee has been affected by climatic conditions, due to the occurrence of increasingly prolonged periods of drought as a consequence of the global warming phenomenon (DAMATTA et al, 2010)
The experiment was conducted in a climatecontrolled greenhouse in the experimental area of the Center for Studies and Diffusion of Technology in Forests, Water Resources, and Sustainable Agriculture (Núcleo de Estudos e Difusão de Tecnologia em Florestas, Recursos Hídricos e Agricultura Sustentável - NEDTEC) of the Agricultural Sciences Centre at the Federal University of Espírito Santo (Centro de Ciências Agrárias da Universidade Federal do Espírito Santo - CCA-UFES), located in the municipality of Jerônimo Monteiro, situated at latitude 20°47’25′′S, longitude 41°23’48′′W and an altitude of 120 m
After the bedding was prepared, two seeds were sown per plastic bag
Summary
Froehner) is a crop of recognized economic and social importance due to its production volume, domestic consumption, share in export tariffs, and capacity for generating employment and income. It is the second most traded commodity in the world, falling a little short behind oil products (SAKIYAMA et al, 2015). The production of coffee has been affected by climatic conditions, due to the occurrence of increasingly prolonged periods of drought as a consequence of the global warming phenomenon (DAMATTA et al, 2010). In the cultivation of coffee, very dry periods can reduce productivity by up to 80% (DAMATTA et al, 2010)
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