协青早B//协青早B/东乡野生稻BC1F5群体产量性状QTL分析

两年同地种植协青早B//协青早B/东乡野生稻BC1F5群体的202个株系，利用含149个DNA标记的连锁图谱，检测到23个产量性状QTLs，包括每株穗数2个、每穗实粒数4个、每穗总粒数6个、结实率5个、千粒重4个和单株产量2个；有9个QTLs的增效等位基因来自东乡野生稻，包括每株穗数2个、每穗实粒数1个、每穗总粒数5个和千粒重1个，其中6个与前人应用野栽群体检测到的产量性状QTLs位于相似区间。这23个QTLs分布于除第11染色体外的所有水稻染色体中，其中18个形成8个QTL簇，含增效等位基因来自野生稻的2个、来自协青早B的4个，以及效应方向发生变化的2个。这些结果为东乡野生稻增产等位基因的发掘提供了基础。

Identification of QTLs for Yield Traits in the BC1F5 Population of Xieqingzao B//Xieqingzao B/Dongxiang Wild Rice

A rice population consisting of 202 BC1F5 lines of the interspecies cross Xieqingzao B (Oryza sativa) //Xieqingzao B/Dongxiang wild rice (O. rufipogon) was tested in 2 years at the same trial site. A total of 23 QTLs for yield traits were detected using a linkage map consisting of 149 markers. The numbers of QTLs detected for individual traits were 2 for the number of panicle per plant (NP), 4 for the number of filled grains per panicle (NFGP), 6 for the total number of spikelets per panicle (TNSP), 5 for spikelet fertility (SF), 4 for 1000-grain weight (TGWT) and 2 for grain yield per plant (GYD). Nine of the QTLs had the enhancing alleles from the Dongxiang wild rice, including 2 for NP, 1 for NFGP, 5 for TNSP and 1 for TGWT. Six of them were located in intervals where QTLs for yield traits have been reported in other studies using 9 interspecies populations. The 23 QTLs were distributed in all the 12 rice chromosomes except chromosome 11. Eighteen of the QTLs were located in 8 clusters. The enhancing alleles were from Xieqingzao B in 4 clusters and from the Dongxiang wild rice in 2 clusters, while the allelic direction in the remaining clusters varied for different traits.