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首页> 外文期刊>Journal of Experimental Botany >Introgression of two chromosome regions for leaf photosynthesis from an indica rice into the genetic background of a japonica rice.
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Introgression of two chromosome regions for leaf photosynthesis from an indica rice into the genetic background of a japonica rice.

机译：chromosome稻叶片光合作用的两个染色体区域渗入了粳稻的遗传背景。

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摘要

Increases in rates of individual leaf photosynthesis (Pn) are critical for future increases of rice yields. A previous study, using introgression lines derived from a cross between indica cultivar Habataki, with one of the highest recorded values of Pn, and the Japanese elite cultivar Koshihikari, identified four QTLs (qCAR4, qCAR5, qCAR8, and qCAR11) that affect Pn. The present study examined the combined effect of qCAR4 and qCAR8 on Pn in the genetic background of Koshihikari. The pyramided near-isogenic line NIL(qCAR4+qCAR8) showed higher Pn than both NIL(qCAR4) and NIL(qCAR8), equivalent to that of Habataki despite being due to only two out of the four QTLs. The high Pn of NIL(qCAR4+qCAR8) may be attributable to the high leaf nitrogen content, which may have been inherited from NIL(qCAR4), to the large hydraulic conductance due to the large root surface area from NIL(qCAR4), and to the high hydraulic conductivity from NIL(qCAR8). It might be also attributable to high mesophyll conductance, which may have been inherited from NIL(qCAR4). The induction of mesophyll conductance and the high leaf nitrogen content and high hydraulic conductivity could not be explained in isolation from the Koshihikari background. These results suggest that QTL pyramiding is a useful approach in rice breeding aimed at increasing Pn.
机译：单个叶片光合作用速率（P n ）的增加对于未来水稻产量的提高至关重要。先前的一项研究使用源自记录最高P n 之一的in种Habataki与日本优良品种Koshihikari之间的杂交衍生的渗入系，鉴定了四个QTL（qCAR4，qCAR5，qCAR8和qCAR11）会影响P n 。本研究在越光遗传背景下研究了qCAR4和qCAR8对P n 的联合作用。金字塔状的近等基因线NIL（qCAR4 + qCAR8）的P n 均高于NIL（qCAR4）和NIL（qCAR8），与Habataki相当，尽管这是由于四个中只有两个QTL。 NIL（qCAR4 + qCAR8）的高P n 可能归因于较高的叶片氮含量，这可能是从NIL（qCAR4）继承而来的，这归因于根系表面较大而产生的大水力传导率面积从NIL（qCAR4）开始，到高水力传导率从NIL（qCAR8）开始。它也可能归因于较高的叶肉电导，这可能是从NIL（qCAR4）继承而来的。不能仅从越光背景中解释叶肉电导率的诱导，高叶氮含量和高水导率。这些结果表明，QTL金字塔是水稻育种中提高P n 的一种有用方法。

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