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野生大豆×栽培大豆RIL群体高密度遗传图谱构建及SNP偏分离分析

High Density Genetic Map Construction and SNP Segregation Distortion Analysis in RIL Population of Wild Soybean × Cultivated Soybean

  • 摘要: 通过研究野生大豆与栽培种大豆群体构建过程中产生的偏分离现象,发掘偏分离区间(Segregation Distortion Region, SDR)和候选基因,有助于探究偏分离在大豆中的产生机制。应用地方品种“一千粒”和野生品种“长岭野生豆”配置杂交组合,获得F6代重组自交系(Recombinant Inbred Lines, RIL)株系200株,利用SLAF-seq进行测序分析,构建高密度遗传图谱,获得该群体可靠的4 564个SNP标记。偏分离分析发现,648个标记发生偏分离(P<0.05),占总标记的14.20%。获得22个SDR,分布在9个不同的染色体上。在SDR区间内共发现8个重度偏分离热点区域(Extreme Segregation Distortion, ESDR),分布在5个不同的染色体上,其中3个ESDR偏向父本野生型,5个ESDR偏向母本栽培型。利用基因功能注释及全基因组重测序数据,结合ESDR区域,影响胚胎发育(Glyma.01G051400)及雌配子体发育(Glyma.16G072700)的基因分别被认为是ESDR1-1和ESDR16-1的候选基因。本研究结果为今后偏分离基因定位提供可靠依据,并为阐明偏分离现象奠定基础。

     

    Abstract: This study examined the segregation distortion during the process of constructing wild soybean and cultivated soybean population, to explore the segregation distortion regions(SDRs) and candidate genes, and to shed some light on understanding the mechanism of segregation distortion in soybean. The wild variety ‘Changling wild soybean’ was used as the male parent and the landrace variety ‘Yiqianli’ was used as the female parent to develop a hybrid group, resulting in 200 recombinant inbred lines(RIL). SLAF-seq was used for sequencing analysis and constructing a high-density genetic map. 4 564 SNP markers were obtained and reliably identified for this population. Through segregation distortion analysis, 648 markers were found to have genetic distortion(P<0.05), accounting for 14.20% of the total markers. 22 SDRs were found, which were distributed across 9 different chromosomes. In SDRs, 8 extreme SDRs regions(ESDRs) were found, distributed on 5 different chromosomes, of which 3 ESDRs were biased towards the wild type of the male parent, and 5 ESDRs were biased towards the cultured type of the female parent. Using gene function annotation and genome-wide resequencing data, combined with the ESDR region, the affecting embryonic development(Glyma.01G051400) and female gametophyte development(Glyma.16G072700) genes were identified as candidate genes in ESDR1-1 and ESDR16-1, respectively. This study provides a reliable basis for locating the segregation distortion genes in the future, and lays the foundation for elucidating the segregation distortion.

     

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