Authors: LJ Ou WJ Li LF Tian Z Chen XJ Dai LX Deng YL Qiu H Li P Liu MZ Liang S Luan LB Chen
Publish Date: 2008/12/10
Volume: 46, Issue: 4, Pages: 589-
Abstract
Biao 810S is a chlorina mutant of the thermosensitive genic male sterile TGMS rice We compared photosynthetic characteristics of these two lines The contents of chlorophylls and carotenoids in Biao 810S were approximately half of those in 810S However the net photosynthetic rate P N of Biao 810S was higher than that of 810S under high irradiance or low concentration of carbon dioxide and the photon quantum efficiency was higher than that of 810S The activity of ribulose15bisphosphate carboxylase/oxygenase in Biao 810S was only 6980 of that in 810S but the activities of phosphoenolpyruvate carboxylase and NADPmalic enzyme were 7950 and 6906 higher than those of 810S respectively suggesting that the efficiency of photon energy utilization in Biao 810S was enhanced by reduction of thermal dissipation and increase of electron transfer rate to generate sufficient assimilation power for the dark reactions Consequently the increased activities of C4 photosynthetic enzymes lead to more effective fixation of CO2 and the synergistic effect of light and dark reactions contributed to the higher P N of Biao 810S
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