数字农科院2.0

水稻苗期耐热种质资源筛选及QTL定位

文献类型: 中文期刊

作者: 刘进;崔迪;余丽琴;张立娜;周慧颖;马小定;胡佳晓;韩冰;韩龙植;黎毛毛

作者机构:

关键词: 水稻; 苗期; 耐热性; 资源筛选; QTL; qHTS8

期刊名称:中国水稻科学

ISSN: 1001-7216

年卷期: 2022 年

页码:

收录情况: 北大核心(2020版) ; CSCD(2021-2022年度) ; 科技核心(2021版) ; 农林核心(2020版)

摘要: 【目的】鉴定和筛选水稻极端耐热种质或基因,为培育耐高温水稻新品种提供技术支撑和物质基础。【方法】本研究以耐热等级和幼苗存活率为指标对不同类型水稻苗期耐热性进行鉴定评价,以期筛选和鉴定耐热种质资源及主效QTL。【结果】不同类型水稻品种苗期耐热性存在明显差异,籼稻品种耐热性明显强于粳稻品种,籼稻和粳稻品种均存在极端耐热和极端敏感种质资源;共筛选出嘉育253、中优早8、秀水09等20份耐热种质资源,高温处理后幼苗存活率和生长发育基本不受影响。RIL群体双亲耐热等级和幼苗存活率存在极显著差异,中优早8耐热性较强,植株基本无枯死,龙稻5对高温胁迫较敏感,不同株系间苗期耐热性存在较大幅度变异;共检测到12个苗期耐热相关QTL,分布于1、3、4、5和8号染色体上,耐热等级和存活率QTL存在明显的遗传重叠,主效QTL簇qHTS4b和qHTS8表型贡献率较大。基于QTL初步定位结果,利用相对剩余杂合体RHL-F2群体,在第8号染色体RM5808-RM556标记区域鉴定了一个苗期耐热性主效QTL qHTS8,该区域对苗期耐热性具有较强调控效应。【结论】筛选出20份苗期耐热性较强的水稻种质资源,鉴定了12个苗期耐热相关的QTL,定位和验证了一个调控水稻苗期耐热性的主效QTLqHTS8,研究结果将为水稻苗期耐热性生理生化机理与分子遗传机制的研究及育种利用工作奠定基础。

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