水稻穗颈维管束及产量相关性状的QTL分析

采用2个偏粳品种“光三”／C418的重组自交系群体，构建SSR标记的连锁图谱，并以此对水稻穗颈维管束数和产量相关性状进行了QTL(Quantitative Trait Loci)分析。在第1，5，8和11染色体上检测到4个控制穗颈大维管束数的QTL。在第5，9和10染色体上检测到3个控制穗颈小维管束数的QTL；共检测到产量及8个与产量相关性状的30个QTL。通过分析穗颈维管束数与穗一、二次枝梗数，穗一、二次枝梗粒数，穗粒数，结实率，单株产量QTL在染色体上的分布及连锁关系，表明穗颈维管束是影响产量的重要解剖结构；通过增加穗颈大、小维管束数可望增加水稻“库”的容量。保证“流”的畅通。

Mapping QTLs for vascular bundle in peduncle and yield components of rice ( Oryza sativa L.)

The vascular bundle in peduncle of rice is the important channel of the transportation of photosynthetic products for panicle. In this study, a recombination inbred lines population, derived from the cross between the two Japonica-like cultivars: Guangsan and C418, was used to construct SSR marker linkage map and to map the quantitative trait loci(QTL) controlling number of vascular bundles in peduncle, yield and yield components. Four QTLs for the number of large vascular bundles in peduncle were detected on chromosomes 1, 5, 8 and 11,respectively. Three QTLs for the number of small vascular bundles in peduncle were mapped on chromosomes 5, 9 and 10,respectively. A total of thirty QTLs belong to eight traits of yield components were detected. Through the analysis of linkage relationship among QTLs controlling vascular bundles in peduncle, primary and secondary rachis branches and grains per panicle, it was suggested that the increase of number of large and small vascular bundles in peduncle might keep the affluent flow as well as enhance the capacity of yield sink of rice.