茶陵野生稻种子休眠性QTL定位
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湖南亚华种业科学研究院

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国家重点研发计划(2018YFD0100900);杂交水稻国家重点实验室(湖南杂交水稻研究中心)开放课题基金(2018KF03);国家自主创新示范区专项(2018XK2005);湖南省科技创新计划(2018NK1020)


QTL Mapping for Seed Dormancy in Chaling Comm on Wild Rice
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Yahua Seeds Science Academy of Hunan

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    摘要:

    我国南方地区水稻(OryzasativaL.)在成熟收获季节常遇连续高温多雨天气,易出现穗发芽现象,严重影响稻米 产量、品质、稻谷贮藏和稻种质量。种子适度的休眠性可避开不良环境对种子萌发的影响,避免或减轻穗发芽危害。因此, 开展水稻种子休眠性遗传机制研究,对培育抗穗发芽水稻品种,保障我国水稻生产与种子产业的发展具有重要意义。本研究 以籼稻品种‘93-11’为受体和轮回亲本,茶陵野生稻(O.rufipogonGriff.)为供体亲本构建的高代回交渗入系群体为材料, 进行种子休眠性鉴定,获得 5 个表现较强休眠性的单株,发芽率为 10.0%-36.5%,而对照及轮回亲本‘93-11’发芽率为 89.5%。 5 个强休眠单株自交后的株系平均发芽率为 3.1%-17.4%,进一步利用其中 3 个株系的强休眠后代单株,分别与‘93-11’杂交 构建 F2群体,通过 BSA(bulkedsegregantanalysis)方法,结合 56K 全基因组 SNP 芯片数据,共检测到 8 个 QTL,分别位于 水稻第 3、5、6、10 号染色体上。本研究为进一步精细定位和克隆种子休眠性 QTL 以及培育抗穗发芽水稻新品种奠定了理论 和材料基础。

    Abstract:

    In southern China, rice (Oryza sativa L.) grains are prone to field pre-harvest sprouting (PHS) due to high temperature and humid weather conditions, which seriously affects the yield, quality and storage of rice. Moderate seed dormancy prevents the adverse effects of the unfavorable environment and helps reduce or avoid PHS. Therefore, genetic studies of seed dormancy and breeding PHS-resistant varieties, are extremely important for rice production and development of seed industry. In this study, we used the indica cultivar ‘93-11’ as the recipient and recurrent parent, and Chaling common wild rice (CLCW) of O. rufipogon Griff. as the donor parent to develop an advanced backcross introgression population consisting of 812 lines. We assessed the seed dormancy of the population, and found five individual plants displaying strong dormancy with the germination rate ranging from 10.0% to 36.5%, while the control and recurrent parent ‘93-11’ had the germination rate of 89.5%. The germination rate of the selfed lines derived from the five strong-dormancy plants ranged from 3.1% to 17.4%. The plants with extremely strong seed dormancy selected from each of 3 selfed lines were crossed with ‘93-11’ to develop the F2 population. By combining the bulked segregant analysis (BSA) and 56K SNP chip data, 8 QTLs were detected, distributed on chromosomes 3, 5, 6, and10. This study will facilitate further map-based cloning of these QTLs and breeding PHS-resistant rice varieties.

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郑传琴,江南,曾苗春,等.茶陵野生稻种子休眠性QTL定位[J].植物遗传资源学报,2020,21(6):1521-1526.

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  • 收稿日期:2020-06-17
  • 最后修改日期:2020-08-10
  • 录用日期:2020-08-14
  • 在线发布日期: 2020-11-05
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