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Diurnal variation in photosynthetic efficiency of leaves in satsuma mandarin

Chen Zhihui, Zhang Liangcheng

Zhejiang Agricultural University. Hangzhou,Zhejiang

Abstract

Daily variation in quantum efficiency was dependent on leaf temperature at which the CO_(2)uptake was measured. #PHI#_(i)decreased with increase in leaf temperature and remained unchanged throughout the day if measured at similar leaf temperature. The negative effect of temperature increase on photosynthetic efficiency was attenuated or even eliminated by lowering the O_(2)concentration in the air. Quantitative measurements of the enhancement of photosynthesis by 2% O_(2) at different temperatures of different times of the day seem to indicate that it is the increase in rate of photorespiration relative to rate of photosynthesis rather than a light-induced damage to and inhibition of reactions in photosynthetic apparatus that leads to the decrease in efficiency in midday.

Key words: Phytosynthetic effidency;Apparent quantum yield;Phototespiration;Diurnal variation;Citrus unshin Mare

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Citing This Article：

Chen Zhihui, Zhang Liangcheng. Diurnal variation in photosynthetic efficiency of leaves in satsuma mandarin. Acta Physiol Sin 1994; 46 (3): (in Chinese with English abstract).