Genetic connection between cell-wall composition and grain yield via parallel QTL analysis in indica and japonica subspecies.
Genetic connection between cell-wall composition and grain yield via parallel QTL analysis in indica and japonica subspecies.
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通过籼稻和粳稻亚种平行QTL分析细胞壁组成与谷物产量之间的遗传联系
DOI：
10.1038/s41598-017-12903-5
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发表时间：
2017-10-02
影响因子：
4.6
通讯作者：
Liu Q
中科院分区：
文献类型：
--
作者：
Xu Z;Li S;Zhang C;Zhang B;Zhu K;Zhou Y;Liu Q
籽粒产量是一个复杂的性状，与生物生产力密切相关。细胞壁是生物量的核心元素，其生物发生有助于植物的结构和发育。然而，细胞壁特性和谷物产量之间的遗传联系在很大程度上还不清楚。在这里，我们报告的数量性状基因座（QTL）的确定与产量相关的性状和细胞壁组成的一组染色体片段置换系（CSSLs），是由9311，一个籼稻品种作为供体，日本晴，一个粳稻品种作为受体。日本晴和9311在籽粒产量相关性状和细胞壁组成上存在显著差异。利用分子标记对9311的125个株系进行了基因分型，占9311全基因组的95.6%。共检测到37个与产量相关的QTL和19个与细胞壁组成相关的QTL。除相关分析外，还发现了两组性状的重叠和紧密连锁的QTL。精细定位进一步缩小了纤维素含量的QTL，以及已知的抽穗期和籽粒产量的QTL HD17，表明植物可能通过相关手段调节细胞壁生物合成和籽粒产量。本研究为这两个复杂性状的QTL定位提供了遗传线索。
Grain yield is a complicated trait, which is highly associated with biomass productivity. The cell wall is a central element of biomass, and its biogenesis contributes to plant architecture and development. However, the genetic link between cell-wall property and grain yield is largely unclear. Here, we report on identification of quantitative trait loci (QTLs) for grain yield-related traits and cell-wall composition with a set of chromosomal segment substitution lines (CSSLs) that were generated by using 9311, an indica cultivar as donor, and Nipponbare, a japonica cultivar as recipient. Nipponbare and 9311 showed significant differences in grain yield-related traits and cell-wall composition. Genotyping with molecular markers, 125 lines covering 95.6% of the whole genome of 9311 were employed for phenotypic and chemical examinations. Thirty-seven QTLs for grain yield-related traits and nineteen QTLs for cell-wall composition have been identified. In addition to correlation analysis, we found overlapped and closely linked QTLs for two sets of traits. Fine-mapping further narrowed a QTL for cellulose content together with HD17, a known QTL for heading date and grain yield, suggesting that plants may regulate cell wall biogenesis and grain yield via related means. Our study provided genetic clues for cloning QTLs for both complicated traits.
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