Photosynthesis of the flag leaf blade and its sheath in high-yielding hybrid rice 'Liangyoupeijiu'.

植物生理与分子生物学学报 Pub Date : 2007-12-01
Zhao-Wu Guo, He-Song Li, Ruo-Zhong Wang, Lang-Tao Xiao
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引用次数: 0

Abstract

Using high-yielding hybrid rice 'Liangyoupeijiu' (LYP9) and hybrid rice 'Shanyou 63' (SY63) as the experimental materials and using (14)C radio-autography, the photosynthetic capacities and distribution of photosynthates in flag leaf blades and sheaths of LYP9 were studied. The results showed that net photosynthetic rates (Pn) of the flag leaf blades and sheaths of LYP9 were much higher than those of SY63; the light transmissivity rates (LT) measured at the medium height of the flag leaf sheaths and the penultimate leaf sheaths were also significantly higher than those of SY63. The incipient activities, total activities and activation percentages of Rubisco in the flag leaf blade and sheath of LYP9 were all higher than those of SY63. The photosynthate transport rate in the sheaths of LYP9, and the quantity of photosynthate transported to the spikes and transformed to economic yield of LYP9 were all higher than those of SY63. The photosynthates produced by the sheaths were mainly transported to spike to make a certain contribution (about 15%) to yield.

高产杂交稻‘两优培九’旗叶及其叶鞘的光合作用
以高产杂交稻‘两优培九’(LYP9)和杂交水稻‘汕优63’(SY63)为材料,利用(14)C射线自显影技术,研究了LYP9的旗叶和鞘内光合能力及光合产物的分布。结果表明:LYP9的旗叶和鞘的净光合速率(Pn)显著高于SY63;旗叶鞘和倒数叶鞘中高处的透光率(LT)也显著高于SY63。LYP9的旗叶和鞘Rubisco的初始活性、总活性和活化百分比均高于SY63。叶鞘内光合物质运输速率、输送到穗部转化为经济产量的光合物质数量均高于SY63。鞘部产生的光合产物主要转运到穗部,对产量有一定贡献(约15%)。
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