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核农学报  2015 

盐胁迫下水稻苗高和分蘖数的发育动态QTL分析

DOI: 10.11869/j.issn.100-8551.2015.02.0235, PP. 235-243

Keywords: 水稻,盐胁迫,苗高,分蘖数,不同发育时期,QTL与环境互作

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Abstract:

为了检测盐胁迫下水稻苗高和分蘖数的发育动态QTL,以粳稻品种东农425和长白10为亲本衍生的F2:3群体为试验材料,构建了包含123个SSR标记,全长为1616.53cM,平均图距为13.14cM的遗传连锁图谱。以浓度为6ds·m-1的NaCl水溶液进行大田生育期灌溉,正常水灌溉为对照,对盐胁迫下水稻的苗高和分蘖数进行发育动态QTL分析。分别利用完备区间作图法和混合线性模型的QTL定位方法,联合盐胁迫与正常条件下6个发育时期苗高和分蘖数的表型数据,共检测到6个控制盐胁迫下水稻苗高和3个控制分蘖数的加性QTL、4个控制正常条件下苗高和5个控制分蘖数的加性QTL、盐胁迫和正常条件联合下的6个控制苗高和4个控制分蘖数的加性QTL,以及3对控制苗高和1对控制分蘖数的上位性QTL。加性QTLqSH1在t3、t4和t2/t1时期分别用非条件和条件方法检测到,加性QTLqTN8-2在t2、t3、t4和t5时期被连续用非条件方法检测到,在t3/t2时期用条件方法被检测到。分别检测到4个控制苗高和2个控制分蘖数的加性QTL与盐胁迫环境存在互作效应,控制苗高的3对上位性QTL和控制分蘖数的1对上位性QTL均与盐胁迫环境发生互作。本研究旨在检测不同发育时期控制盐胁迫下水稻苗高和分蘖数的QTL,并分析与盐环境的互作效应,为解析苗高和分蘖数在盐胁迫下的发育遗传特点和水稻耐盐QTL分子标记辅助育种提供理论依据。

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