水稻产量库相关穗部性状的遗传分析

收人李源于珍汕97/明恢63的重组系群体中与产量库容有关的10个穗部性状的表现型数据。总体上，每穗颖花数与每穗二次枝梗数、每个二次枝梗上的颖花数、颖花密度有更大的相关性。对所研究的10个性状，两年间共检测到53个QTLs。约43.4%的QTLs能在两年同时检测到。5个染色体区域（第1染色体上G359-RG532和C567-C86-RG236,第2染色体上R712-RM29，第6染色体上P-RG424，第10染色体上C148-RM258）分别对多个穗部性状表现出效应。结果显示相关性状的QTLs大致定位在相似的染色体区域，这表明基因的多效性或紧密连锁是穗部性状间相关的遗传基因。在检测到的大量2位点互作对中，约18.2%在两年都能被检测到。不同性状的共同互作对的比例为8.7%～32.6%。在两年都能检测到2位点组合中，约26.7%的组合同时影响着多个性状，表现出多效效应。结果表明每个性状都由数个QTL、基因型与环境互作、大量的上位性互作所控制。

Genetic Analysis of the Panicle Traits Related to Yield Sink Size of Rice

In the study,ten panicle traits associated with yield sink size were measured in a recombinant inbred population derived from Zhenshan 97×Minghui 63. Generally,spikelets per panicle were more closely correlated with number of secondary branch per panicle,spikelets on secondary branch per secondary branch,and spikelet density. A total of 53 QTL were detected for ten traits in two years. Approximately 43.4% QTLs were detected in both two years,suggesting environmental effects on traits. Five chromosomal regions (G359-RG532 and C567-C86-RG236 on chromosome 1,R712-RM29 on chromosome 2,P-RG424 on chromosome 6,C148-RM258 on chromosome 10)were detected to have effects on multiple panicle traits. QTLs for traits,which were correlated,were generally localized in similar chromosomal regions,suggesting that pleiotropy and (or) linkage are the molecular basis of relationship between them. A large number of digenic interactions were detected,18.2% of which were detected simultaneously in both two years. The proportion of common interactions was trait-depended,ranging 8.7% for spikelets on secondary branch per secondary branch to 32.6% for panicle length. Approximately 26.7% of common two-locus combinations had pleiotropic effects by simultaneously influencing two or more traits. Overall,the results indicate that each panicle trait is controlled by several QTLs,genotype×environment interaction,and a large number of epistatic interactions.