Photoinhibition and recovery of photosynthesis in Coffea arabica and C. canephora
1997
Matta, F.M. da | Maestri, M. (Universidade Federal de Vicosa (Brazil). Dept. de Biologia Vegetal)
Photosynthetic parameters were determined in disks from leaves of C. arabica cv. Red Catuai and C. canephora cv. Kouillou. Kouillou showed a relatively higher irradiance requirement for saturating photosynthesis, lower chlorophyll (Chl) content, and higher Chl a/b ratio than Catuai. Photoinhibition of photosynthesis under bright irradiance was manifested by decreases in maximum photochemical efficiency. Chloramphenicol both accelerated photoinhibition (mainly in Kouillou) and blocked its recovery for at least 190 min in either cultivar. Photosynthetic oxygen evolution under photoinhibitory conditions was decreased by chloramphenicol. In both coffee cultivars, the depressed photochemical efficiency of photosystem 2 was not accompanied by a concomitant lowering in oxygen evolution during reversal from photoinhibition.
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