Interação entre os aumentos da [CO2] e da temperatura sobre o metabolismo fotossintético em Coffea arabica L.

摘要: The predicted enhancement of air [CO2] and global climate changes in this century, linked, e.g., to increased temperatures, appear as a risk factor for coffee crop according it agroclimatic zoning. However, after exposure long-term adverse conditions, plants may trigger acclimation/tolerance mechanisms. Furthermore, the positive impact enhanced on photosynthetic metabolism (and absence down regulation) might help mitigate effects high temperature plant, which was never characterized Coffea sp.. Therefore, study aims at linking physiological biochemical responses IX Simposio de Pesquisa dos Cafes do Brasil 24 26 junho 2015, Curitiba PR using probe evaluate acclimation tolerance plant. For that, arabica L. cv. IPR 108 were grown one year 25/20 oC (day/night) under controlled conditions (temperature, relative humidity, irradiance, photoperiod), 380 or 700 μL CO2 L, without nutrient, water root space limitations. then gradually (0.5 oC/day) from up 42/34 oC. functioning assessed temperatures oC, 31/25 37/30 e through gas exchange (photosynthetic capacity O2 evolution) some parameters chlorophyll fluorescence [initial (Fo), photochemical efficiency maximum PSII (Fv/Fm), linear electron transport rate (ETR) actual (Fv'/Fm')]. results showed higher metabolic performance [CO2]. From 37 normal strong impacts capacity, but affected only by 42 L maintained that rising enabled maintain functional machinery is very relevant considering future climatic changes.