Response to High Temperature in Flag Leaves of Super High-Yielding 
Rice Pei’ai 64S/E32 and Liangyoupeijiu

Abstract

Abstract: Two newly bred hybrid rice combinations, super high-yielding Liangyoupeijiu (Pei’ai 64S×9311) and Pei’ai 64S/E32 (Pei’ai
64S×E32) were used to investigate the photosynthetic characteristics under high temperature in comparison with hybrid rice Shangyou 63. High temperature caused a decreased photosynthetic efficiency and aggravated photoinhibition. The optimum temperature for photosynthetic electron transportation and photosynthetic CO2 fixation were about 28℃ and 35–40℃ respectively.
Linear electron transportation is more sensitive to high temperature than the photochemical process. The mechanism of high temperature adaptation was possibly as follows: super high-yielding rice has quickly increasing carotenoid, which acted as a more
favorable antioxidant system to reduce the active oxygen production and avoid damage to the photosynthesis system; super high-yielding rice has a higher efficiency of xanthophylls cycle to dissipate excess heat energy; super high-yielding rice has a more
stable photosynthetic function, higher photosynthetic efficiency and more heat stable protein content.

Key words: hybrid rice, high temperature, stress, photosynthesis

PENG Chang-lian , OU Zhi-ying , LIU Nan , LIN Gui-zhu . Response to High Temperature in Flag Leaves of Super High-Yielding
Rice Pei’ai 64S/E32 and Liangyoupeijiu[J]. RICE SCIENCE, 2005, 12(3): 179-186 .

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