Molecular Genetic Mapping of QTLs for Tiller Angle in Rice (Oryza sativa L.)
Molecular Genetic Mapping of QTLs for Tiller Angle in Rice (Oryza sativa L.)
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DOI：
10.11248/jsta1957.48.228
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发表时间：
2004-12
期刊：
影响因子：
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通讯作者：
Yanjun Dong;D. Lin;H. Kamiunten;T. Ogawa;Q. Cai;E. Tsuzuki;H. Terao;H. Matsuo
中科院分区：
文献类型：
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作者：
Yanjun Dong;D. Lin;H. Kamiunten;T. Ogawa;Q. Cai;E. Tsuzuki;H. Terao;H. Matsuo
水稻分蘖角度的研究是一种重要的形态性状，它不仅决定植物的类型，而且通过影响空气和光的穿透来影响与光合作用有关的一些因素和疾病。本研究的目的是利用来自水稻品种Asominori和水稻品种IR24的重组自交系，定位水稻分蘖角度的数量性状基因座(QTL)。在RI群体中观察到双亲方向的超亲分离和分蘖角度的连续变异，表明分蘖角度是数量遗传性状。共检测到7个QTL(QTA-2、QTA-4、QTA-7、QTA-8、QTA-9、QTA-11和QTA-12)，分别定位在第2、4、7、8、9、11和12染色体上。其中，遗传效应最大的QTA-9位于9号染色体上XNpb108和C570标记之间，占总表型变异的27.7%~48.5%。其余6个QTL占表型变异的4.9%·13.4%。此外，来自Asominori的QTA-2、QTA-7和QTA-12等位基因增加了水稻的分蘖角度，而来自Asominori的其余4个QTL降低了水稻的分蘖角度。控制分蘖角度的QTL的定位有助于利用分子标记辅助选择改良水稻株型。
Tiller angle in rice (Oryza sativa L.) is an important morphological trait, which not only determines the plant type but also influences some factors related to photosynthesis and diseases by affecting air and light penetration. The objective of the present study was to identify quantitative trait loci (QTLs) for the tiller angle in rice using recombinant inbred (RI) lines derived from a cross between a japonica cultivar Asominori and an indica cultivar IR24. Transgressive segregations in both directions of parents and continuous variation of the tiller angle in the RI population were observed, indicating that the tiller angle was a quantitatively inherited trait. A total of seven QTLs (qTA-2, qTA-4, qTA-7, qTA-8, qTA-9, qTA-11, and qTA-12) affecting the tiller angle were identified and mapped on chromosomes 2, 4, 7, 8, 9, 11, and 12, respectively. Among them, qTA-9 with the largest genetic effect was detected in the interval between the XNpb108 and C570 markers on chromosome9 where more than 27.7%-48.5% of the total phenotypic variation was attributed. The other six QTLs accounted for 4.9%•13.4% of the total phenotypic variation. In addition, the qTA-2, qTA-7, and qTA-12 alleles from Asominori increased the tiller angle, whereas the remaining four QTLs from Asominori reduced the tiller angle in rice. The identification of QTLs controlling the tiller angle may contribute to the improvement of the rice-plant type using marker-assisted selection.