Characteristics of ribulose-1,5-bisphosphate carboxylase and C4 pathway key enzymes in flag leaves of a super-high-yield hybrid rice 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.;Chen, L.;Shi, D. -W.;Chen, G. -X.;Lu, C. -G.;Wang, P.;Wang, J.;Chu, H-J;Zhou, Q. -C.;Zuo, M.;Sun, L.

作者机构：

关键词： C4 pathway enzyme;flag leaf;hybrid rice (Oryza sativa L);ribulose-1,5-bisphosphate carboxylase;senescence

期刊名称：SOUTH AFRICAN JOURNAL OF BOTANY （ 影响因子：2.315； 五年影响因子：2.71 ）

ISSN： 0254-6299

年卷期： 2007 年 73 卷 1 期

页码：

收录情况： SCI

摘要： A newly-developed super-high-yield two-line hybrid rice (Oryza sativa L.) LiangYouPeiJiu (LYPJ) together with its paternal line Wumang 9311 (WM9311) and maternal line Peiai 64S (PA64S) were used as experimental materials. The activities of C4 pathway photosynthetic enzymes, i.e. phosphoenolpyruvatecarboxylase (PEPcase), NADP-malic enzyme (NADP-ME), NADP-malate dehydrogenase (NADP-MDH), pyruvate phosphate dikinase (PPDK) and the key C3 pathway enzyine-ribulose-1,5-bisphosphate carboxylase (RuBPcase), as well as soluble protein were assayed during the days after emergence (DAE) of flag leaves. The results indicated that C4 pathway enzymes were expressed differently during the flag leaf's span of life. The activity of PEPcase, NADP-MDH, and PPDK were increased with leaf age after full expansion, reached the peak at around 32 DAE, and then fell down significantly, and the activity of NADP-ME increased before 23 DAE and decreased earlier than other C4 enzymes, at 32 DAE, indicating that NADP-ME may be more sensitive to senescence than other C4 enzymes. The activity of RuBPcase was significantly higher in LYPJ than that in its parents during the whole life span of flag leaves. The decrease in RuBPcase activity was greater than that in soluble protein content. The onset of loss of RuBPcase activity (11 DAE) occurred earlier than that of soluble protein content (23 DAE). In comparison, there was no significant difference in C4 pathway enzymes between LYPJ and its parents. (c) 2006 SAAB. Published by Elsevier B.V. All rights reserved.

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