Genetic dissection of heterotic loci associated with plant weight by Graded pool-seq in heading Chinese cabbage (Brassica rapa)

文献类型： 外文期刊

第一作者： Yue, Lixin

作者： Yue, Lixin;Sun, Rifei;Li, Guoliang;Cheng, Feng;Zhang, Shifan;Zhang, Hui;Zhang, Shujiang;Li, Fei;Yue, Lixin;Sun, Rifei;Gao, Limin;Wang, Qinghua

作者机构：

关键词： Formation mechanism of heterosis; Heading Chinese cabbage; Plant weight; QTL mapping

期刊名称：PLANTA （ 影响因子：4.54； 五年影响因子：4.689 ）

ISSN： 0032-0935

年卷期： 2022 年 255 卷 6 期

页码：

收录情况： SCI

摘要： Main conclusion Four heterotic QTL and a heterozygous segment for plant weight were identified by Graded Pool-Seq, QTL-seq and traditional genetic linkage analysis in heading Chinese cabbage. Heading Chinese cabbage (Brassica rapa L. spp. pekinensis) is a cross-pollinated leafy vegetable with significant heterosis. The use of heterosis is important for breeding high-yield Chinese cabbage hybrids. However, the formation and mechanism of heterosis have not been studied. We dissected the molecular mechanism of heterosis of yield-related traits in Chinese cabbage. An F-1 hybrid with high-parent heterosis of yield-related traits was selected and self-pollinated to generate segregating F-2 populations. QTL-seq, Graded Pool-seq (GPS), and traditional genetic linkage analysis were used to identify four heterotic quantitative trait loci (QTL) for plant weight: qPW1.1, qPW5.1, qPW7.1, and qPW8.1. Traditional genetic linkage analysis over two years showed that qPW8.1, located in marker A08_S45 (18,172,719) and A08_S85 (18,196,752), was mapped to a 23.5 kb genomic region. QTL qPW8.1 explained 8.6% and 23.6% of the phenotypic variation in plant weight and the total numbers of head leaves, respectively, and contained a heterozygous segment that might control the heterosis of plant weight. The qPW1.1 made an 11.7% phenotypic contribution to plant weight. The qPW7.1 was sensitive to environmental influence and explained 10.7% of the phenotypic variance. QTL qPW5.1 had a significant signal and was located in a genetic region near the centromere showing high heterozygosity. The "pseudo-overdominance" and "synergistic allelic" effects from parent line "XJD4" appear to play an important role in heterosis for plant weight in Chinese cabbage. These results provide a basis for an improved understanding of the molecular mechanism of yield-related traits and their heterosis.

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