Genetic dissection of the source-sink relationship affecting fecundity and yield in rice (Oryza sativa L.)
Genetic dissection of the source-sink relationship affecting fecundity and yield in rice (Oryza sativa L.)
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DOI：
10.1023/a:1009608128785
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发表时间：
1998-01-01
影响因子：
3.1
通讯作者：
Paterson, AH
中科院分区：
文献类型：
--
作者：
Li, ZK;Pinson, SRM;Paterson, AH
以2418个水稻亚种间杂交F_4代F_2为材料，研究了水稻源叶与库容量关系的遗传基础。Lemont（japonica）和cv.并利用115个分布较好的RFLP标记构建了一张完整的连锁图谱。通径分析表明，剑叶面积的变异对一级库容量-穗粒重表型变异的贡献率为50%。共检测到13个QTL和30对上位性位点，分别影响源叶长、源叶宽、源叶面积、主库（穗）大小、穗长、小花密度和每穗小花数。2个QTL（QL 13 b和QLw 4）和7对上位性位点主要负责源叶和库容量之间的关系。其他因素主要影响源叶的形状或穗长/分枝，对观察到的源库关系贡献不大，并部分解释了产量构成因素的补偿。这些结果表明，可以通过分子标记辅助选择来操纵影响源叶的重要QTL，以增加库容量，从而提高水稻的产量潜力。
The genetic basis underlying the relationship between the source leaves (the top two leaves) and the sink capacity in rice was investigated in a replicated trial of 2418 F-2 derived F-4 progeny from an inter-subspecific cross between cv. Lemont (japonica) and cv. Teqing (indica) and a complete linkage map with 115 well distributed RFLP markers. Path analysis indicated that 50% of the phenotypic variation in the primary sink capacity-grain weight per panicle was attributable to variation of the flag leaf area. Thirteen QTL and 30 pairs of epistatic loci were identified, which influence the length, width and area of the source leaves and the size of the primary sink (panicles) panicle length, floret density and floret number per panicle. Two QTL (QLl3b and QLw4) and 7 pairs of epistatic loci are largely responsible for the observed relationship between the source leaves and the sink capacity. The others appear to primarily influence the shape of the source leaves or panicle length/branching, and contribute little to the observed source-sink relationship and partially explain the yield component compensation. Our results suggest that important QTL affecting the source leaves can be manipulated through marker-assisted selection to increase sink capacity, which might result in improved yield potential in rice.