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Position: Home > Articles > Response to High Temperature in Flag Leaves of Super High-Yielding Rice Pei'ai 64S/E32 and Liangyoupeijiu Rice Science 2005,12 (3) 179-186

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

作  者:
PENG Chang-lian;Ou Zhi-ying;LIU Nan;LIN Gui-zhu
单  位:
College of Life Science; Guangzhou 510631; China; South China Normal University
关键词:
hybrid rice;high temperature;stress;photosynthesis
摘  要:
Two newly bred hybrid rice combinations, super high-yielding Liangyoupeijiu (Pei'ai 64SX9311) and Pei'ai 64S/E32 (Pei'ai 64SXE32) 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 CO_2 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.

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