Photosynthetic and biochemical activities in flag leaves of a newly developed superhigh-yield hybrid rice (Oryza sativa) and its parents during the reproductive stage

文献类型： 外文期刊

第一作者： Zhang, C. -J.

作者： Zhang, C. -J.;Chu, H. -J.;Chen, G. -X.;Shi, D. -W.;Zuo, M.;Wang, J.;Lu, C. -G.;Wang, P.;Chen, L.

作者机构：

关键词： carboxylation efficiency;electron transport;flag leaf;Hybrid rice (Oryza sativa L.);polypeptide;senescence;RIBULOSE-1;5-BISPHOSPHATE CARBOXYLASE-OXYGENASE;SENESCENCE;LEAF;PLANTS;WHEAT;PHOTOPHOSPHORYLATION;ACTIVATION;L.

期刊名称：JOURNAL OF PLANT RESEARCH （ 影响因子：2.629； 五年影响因子：2.926 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： Responses of net photosynthetic rates to intercellular CO2 concentration (P-n/C-i curves) and photochemical characteristics were investigated in flag leaves of newly developed superhigh-yield hybrid rice (Oryza sativa L.) LiangYouPeiJiu (LYPJ) and its maternal PeiAi64S (PA64S) and paternal Wu-Mang9311 (WM9311) lines grown in the field during the reproductive stage. The results showed that photosynthetic functions, such as the electron transport activities of photosystems and photophosphorylation, assessed in vivo from P-n/C-i curves under field conditions declined more or earlier than those obtained in vitro. The degradation of polypeptides of thylakoid membranes was slower than those for P-Ca=360 (light-saturated net photosynthetic rate measured at 360 mu mol mol(-1)) and CE (carboxylation efficiency, obtained from the initial slope of the P-n/C-i curve). The initial inhibition of the PSII electron transport and oxygen-evolving activity induced by senescence occurred before the degradation of the oxygen-evolving complex. In comparison, LYPJ had intermediate photosynthetic functions in the early stage of leaf development, but greater photochemical activities in the mid and late stages. WM9311 showed a similar pattern of changes but lower values, and PA64S had higher values in the early stage but showed a faster rate of senescence than LYPJ. These findings implied that the hybrid LYPJ demonstrated intermediate photosynthetic activities between its parents in the early stage of leaf development, whereas it had higher photosynthetic activities than its parents in the mid and late stages, which may be responsible for its high yield.

分类号： Q94

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