Resumo

MOSQUERA SANCHEZ, Lyda Patricia; RIANO HERRERA, Néstor Miguel; LOPEZ FORERO, Yamel  e  ARCILA PULGARIN, Jaime. NET PHOTOSYNTHESIS AND CO₂ COMPENSATION CONCENTRATION IN THREE COFFEE (Coffea sp.) GENOTYPES, BEAN AND MAIZE UNDER THREE TEMPERATURES. Rev. Fac. Nac. Agron. Medellín [online]. 2005, vol.58, n.2, pp.2827-2838. ISSN 0304-2847.

The coffee (Coffea arabica L.) genotypes Colombia, Caturra, and Híbrido de Timor, and bean (Phaseolus vulgaris L.) and maize (Zea mays L.) plants were exposed to three temperatures ( 15°C, 25°C and 35°C), and net photosynthetic rates (P_N) and CO₂ compensation concentrations (GCO₂) were measured. P_N in coffee leaves was similar for the three genotypes at 15 °C [5,0 - 5,3 µmol(CO₂) m^-2s^-1] and 35 °C [4,9 - 5,5 µmol(CO₂) m^-2s^-1], but lower at 25 °C [5,4 - 11,7 µmol(CO₂) m^-2s^-1]. GCO₂ increased with temperature in coffee and bean, while in maize no effect was observed. P_N  and GCO₂ values documented in coffee genotypes were typical for C₃ plants.

Palavras-chave : Coffee; Coffea arabica L.; CO₂ compensation concentration; leaf temperature; net photosynthesis; bean; maize.

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