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Photoinhibition in indica and japonica subspecies of rice (Oryza sativa) and their reciprocal F-1 hybrids

文献类型： 外文期刊

作者： Jiao, DM 1 ; Ji, BH 1 ;

作者机构： 1.Jiangsu Acad Agr Sci, Inst Agrobiol Genet & Physiol, Nanjing 210014, Peoples R China

期刊名称：AUSTRALIAN JOURNAL OF PLANT PHYSIOLOGY （ 影响因子：2.398； ）

ISSN： 0310-7841

年卷期： 2001 年 28 卷 4 期

页码：

收录情况： SCI

摘要： Photoinhibitory performance and its physiological basis have been studied in Oryza sativa L. subspecies indica and japonica, and their reciprocal F-1 hybrids. The results demonstrate that the japonica ssp. was usually more tolerant to photoinhibition, indicated by higher maintaining capacity of D1 protein (less degradation), higher induced superoxide dismutase (SOD) activity and longer duration of the activity. Compared with japonica, the indica ssp. was more sensitive to photoinhibition, and exhibited more degradation of D1 protein and a much larger xanthophyll pool. A statistically significant positive correlation exists between D1 protein content and F-v/F-m, PSII activity and P-n during photoinhibition (r(2) = 0.98, 0.93, 0.95, respectively, P < 0.01). This result further supported the hypothesis that D1 protein encoded by plastid genes might play an important physiological role in the mechanism of photoinhibition. This hypothesis is also enhanced by the fact that the capacity of D1 protein synthesis mediated the components and cycle of xanthophyll and non-photochemical quenching in treatment with streptomycin, a D1 protein synthesis inhibitor, while the xanthophyll cycle had a photoprotective role for D1 protein and F-v/F-m in treatment with DDT, a xanthophyll cycle inhibitor. The photoinhibition of reciprocal F-1 hybrids between japonica and indica is mainly intermediate, but somewhat inclined to the maternal line. This demonstrates that the basic feature of photoinhibition was controlled by the interaction of an intrinsic factor, D1 protein encoded by plastid genes, with the xanthophyll cycle, as well as SOD, controlled by nuclear genes. Since the response to photoinhibitory treatment of indica-japonica F-1 hybrids seems to depend on female parents, we propose to select and use photoinhibition-tolerant varieties as female parents for generation of photoinhibition-tolerant hybrids.

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