作物学报 ›› 2024, Vol. 50 ›› Issue (6): 1373-1383.doi: 10.3724/SP.J.1006.2024.31051
张智源1**(), 周界光1**(), 刘家君1,2, 王素容1, 王同著1, 赵聪豪1, 尤佳宁1,3, 丁浦洋1,4, 唐华苹1, 刘燕林1, 江千涛1, 陈国跃1, 魏育明1, 马建1,*()
ZHANG Zhi-Yuan1**(), ZHOU Jie-Guang1**(), LIU Jia-Jun1,2, WANG Su-Rong1, WANG Tong-Zhu1, ZHAO Cong-Hao1, YOU Jia-Ning1,3, DING Pu-Yang1,4, TANG Hua-Ping1, LIU Yan-Lin1, JIANG Qian-Tao1, CHEN Guo-Yue1, WEI Yu-Ming1, MA Jian1,*()
摘要:
有效分蘖数可直接影响小麦的成穗数, 与产量关系极为密切。挖掘小麦分蘖数相关数量性状位点, 解析分蘖数与其他重要农艺性状之间的相关性, 可为分子育种提供理论依据。本研究首先提出和建立了“多个环境评价-单个性状深入-综合性状兼顾-友好标记开发-不同背景验证”的遗传解析新模式。进一步利用该模式, 以寡分蘖自然变异植株msf和川农16 (CN16)构建的F6代重组自交系群体(MC群体)为实验材料, 以多年多点的有效分蘖数作为表型数据, 借助基于16K芯片构建的遗传连锁图谱成功定位和验证了寡分蘖遗传调控位点。QTL定位结果显示, 1A、5A和6D染色体上有4个控制寡分蘖的QTL。其中Qltn.sau-MC-1A为稳定主效的寡分蘖QTL, 解释了13.39%~60.40%的表型变异, 其正效应位点来源于msf。表型分析发现, 携带Qltn.sau-MC-1A正效应位点株系的有效分蘖数显著少于携带Qltn.sau-MC-1A负效应位点株系的有效分蘖数。相关性分析表明, 有效分蘖数和株高之间存在极显著的正相关, 与千粒重、每穗粒数、每穗粒重、旗叶宽之间存在显著的负相关, 有效分蘖数与旗叶长、开花期之间无显著相关。遗传分析结果表明, Qltn.sau-MC-1A正效应位点显著增加每穗粒数、每穗粒重和千粒重, 但推迟开花期。不同遗传背景下的验证结果表明, 携带Qltn.sau-MC-1A正效应位点的株系确实能降低有效分蘖数。综上, 本研究建立了一种遗传解析新模式, 并基于此模式解析、定位和验证了一个控制寡分蘖的主效QTL Qltn.sau-MC-1A, 为进一步精细定位和了解分蘖形成机制奠定了基础。
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