花生籽仁大小相关性状QTL定位

花生籽仁大小相关性状是决定花生产量的直接因素。为发掘与花生籽仁大小相关的QTL,本研究以中花16×J11构建的RIL群体为材料,得到了一张包含289个SSR标记、21个连锁群、覆盖长度为947.3cM的遗传连锁图谱。连续2年对籽仁大小相关性状鉴定表明,各性状在群体中变异广泛,呈典型正态分布,且大部分性状间显著相关。结合本研究构建的遗传图谱,利用WinCart2.5进行QTL定位分析,2年共检测到66个QTL,贡献率为3.23%~33.01%。与籽仁长(SL)、籽仁宽(SW)、籽仁长宽比(LWR)和百仁重(HSW)相关的QTL分别有18、16、18和14个。在这些QTL中,A05染色体上的区间A05A1500?A05A1530同时存在控制籽仁长(qSLA05.1和qSLA05.2)和百仁重的相关的QTL(qHSWA05.1);B06染色体上的区间A06B135?A06B113同时存在控制籽仁宽(qSWB06.2和qSWB06.4)和百仁重相关的QTL(qHSWB06.4),这些稳定存在的主效QTL将为花生产量相关性状的精细定位和分子育种奠定基础。

Identification of QTL related to seed size in peanut (Arachis hypogaea L.)

Seed size-related traits are the direct factors determining the yield of peanut. To identify the QTL related to seed size-related traits, a recombinant inbred lines (RIL) population (188 progenies) derived from Zhonghua 16 × J11 was used in this study. A genetic linkage map of 947.3 cM in length was constructed, containing 21 linkage groups and 289 SSR markers. Seed size-related traits showed extensive variations in two years’ phenotyping. Between most of the traits with significant correlation. Based on the genetic map, we detected 66 QTL with the explained phenotypic variance (PVE) of 3.23%-33.01% were detected using the WinCart 2.5 software. The number of QTL for seed length (SL), seed width (SW), ratio of seed length to width (LWR) and hundred seed weight (HSW) were 18, 16, 18, and 14, respectively. Notably, the A05A1500-A05A1530 interval on Chromosome A05 harbored three QTL, i.e. qSLA05.1 and qSLA05.2 for SL and qHSWA05.1 for HSW, and the A06B135-A06B113 interval on B06 harbored three QTL as well, i.e. qSWB06.2 and qSWB06.4 for SW and qHSWB06.4 for HSW. These stable and major QTL pave a way for fine mapping of peanut yield-related traits and molecular breeding.