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...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.展开更多
基金the National NaturalSciencc Foundation of China(90208022,30471067) IBM Shared University Research(LifeScience).
文摘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.
