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Traits related to photoinhibition of photosynthesis in indica and japonica subspecies of rice and their reciprocal cross F_(1)hybrids

Ji Benhua, Li Zhuanguo, Ge Mingzhi, Tong Hongyu, Jiao Demao

Jiangsu Academy of Agricultural Sciences. Nanjing,Jiangsu

Abstract

To elucidate genetic background of photoinhibition of photosynthesis, triats related to photoinhibition of photosynthesis in indica and japonica subspecies of rice and their reciprocal F_(1) hybrides were explored by isotope tracing and other techniques. Photosynthetic rate and PS Ⅱ activity in all rice genotypes were decreased by photoinhibition. Judging from the relative photosynthetic rate and PS Ⅱ activities after photoinhibition. it can be seen that the percentage of photoinhibition in Japonica rice 02428 and 029 was lower than that in indica rice 3037 and Palghar. However, the percentage of photoinhibition in reciprocal F_(1) hybrids. though lying between values of their parents. was closer to that in their maternal lines than to paternal lines(Table 1). Two factors contributed to the facts mentioned above: (1) Q_(B)-protein was degraded rapidly in all rice genotypes in strong light (Fig.1), and relative contents of Q_(B)-protein(%) after photoinhibition in F_(1) hybrids, lying between values of their parents, were closer to those in their maternal lines than to paternal lines (Table 2): (2) SOD played some role in reducing photoxidative damage to Q_(B)-protein.

Key words: Photoinhibition;Photosystem Ⅱ;Q_(B)-protein;Superoxide dismutase;Hybrid rice

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Citing This Article：

Ji Benhua, Li Zhuanguo, Ge Mingzhi, Tong Hongyu, Jiao Demao. Traits related to photoinhibition of photosynthesis in indica and japonica subspecies of rice and their reciprocal cross F_(1)hybrids. Acta Physiol Sin 1994; 46 (1): (in Chinese with English abstract).