Genetic Dissection of Grain Weight and Its Related Traits in Rice (Oryza sativa L.)
Genetic Dissection of Grain Weight and Its Related Traits in Rice (Oryza sativa L.)
复制标题
DOI：
--
复制
发表时间：
2002
影响因子：
--
通讯作者：
Xu Jian-long
中科院分区：
文献类型：
--
作者：
Xu Jian-long
利用292f13个ril和272个标记的完整连锁图谱，分析了水稻粒重与其6个组成性状（粒长、粒宽、粒厚、长宽、粒体积和粒密度）之间关系的遗传机制。所有性状的rls均表现出明显的海侵分离。籽粒重与其他籽粒性状均呈正相关。籽粒宽度、籽粒厚度和籽粒密度呈显著负相关，可能与籽粒品质有关。共鉴定出48个主效QTL和38个上位QTL对，解释了超过55%的个体性状总变异。超过80%的qtl具有多效性或生理关联。QGl3和QGl2通过粒体积间接影响粒重，其中Lemont等位基因有利于提高籽粒品质。QGw5的Teqing等位基因？QGt1和QGv7增加了籽粒重，但对籽粒品质和籽粒密度有相反的影响。利用标记辅助选择对不同的qtl进行重组，可以提高籽粒重和品质。
The genetic mechanism underlying the relationship between grain weight and its six component traits (grain length, grain width, grain thickness, length/width, grain volume and grain density) in rice was dissected using 292 F 13 RILs and a complete linkage map with 272 markers. The RILs showed tremendous transgressive segregation for all traits studied. Grain weight was positively correlated with all other grain traits. Significant negative associations existed between grain width, thickness and grain density, which could be associated with grain quality. Forty-eight main-effect QTLs and 38 epistatic QTL pairs affecting these traits were identified, collectively explaining over 55% of the total variation of individual traits. More than 80% QTLs tended to have pleiotropism or physiological associations. QGl3 and QGl2 had indirect impacts on grain weight via grain volume, at which the Lemont alleles were beneficial for the improvement of grain quality. The Teqing alleles at QGw5?QGt1 and QGv7 increased grain weight but had inverse impacts on grain quality and grain density. Improvement for grain weight as well as grain quality would be practical by recombination of different QTLs using marker-assisted selection.