穗颈维管性状与产量相关性状的遗传分析

穗颈维管性状是实现"源"合成的同化物输送至籽粒中的唯一通道。本研究利用来源于籼稻93-11(受体)和粳稻日本晴(供体)构建的染色体片段代换系群体,调查穗颈维管性状与穗部产量性状。结果表明,大部分穗颈维管性状与穗部产量性状呈显著相关;7个穗颈维管性状共检测到42个QTL,其中16个位点日本晴等位基因起增效作用;6个穗部产量性状共检测到45个QTL,其中14个位点日本晴等位基因起增效作用。综合分析穗颈维管性状与产量性状的QTL定位区间,发现有6个同时调控穗颈维管性状和穗部产量性状的QTL簇,结合已有报道与候选基因序列分析,推测一因多效基因Ghd7和IPA1可能分别调控第7染色体9 Mb和第8染色体25 Mb的QTL簇。这些结果表明了水稻穗颈维管性状和产量性状既存在不同的遗传基础,也存在共同的遗传机制。挖掘更多控制"流"的QTL与同时调控"流"和"库"的一因多效基因可为水稻聚合育种、品种改良提供十分重要的理论与实践意义。

Genetic Analysis of Vascular Bundle-Related Traits of Neck-panicle and Yield Traits

Neck-panicle is the only channel for assimilation substance that transports to the panicle.In this study,122 chromosome segment substitution lines(CSSL)derived from the cross between indica rice variety 93-11 and japonica rice variety Nipponbare were used to investigate vascular bundle-related traits of neck-panicle and yield traits.The results showed significant correlation between vascular bundle-related traits of neck-panicle and yield traits.A total of 42 quantitative trait loci(QTL)of vascular bundle-related traits and 45 QTL of yield traits were detected.Among them,16 and 14 chromosomal regions with positive allelic effects were from Nippnbare and 93-11,respectively.Gained from the QTL mapping results of these two types of traits,six QTL clusters that regulate both vascular bundle-related and yield traits have been identified.Based on previous studies and the candidate gene analysis,two pleiotropic genes Ghd7 at the 9 Mb site of chromosome 7 and IPA1 at the 25 Mb site of chromosome 8 might be candidate,respectively.These results suggested a diversified genetic basis with partial common genetic mechanism for both rice vascular bundle-related traits and yield traits.Exploration of additional QTLs controlling"flow"and multiple genes regulating the interaction between"flow"and"sink"might provide theoretical and practical significance in rice breeding.