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春小麦抗旱耐热性QTL的遗传重叠
Genetic overlap of QTL for drought and heat resistance of spring wheat
投稿时间:2019-07-31  修订日期:2019-09-27
DOI:
中文关键词:  春小麦  抗旱  耐热  QTL定位  遗传重叠
英文关键词:Wheat  Drought resistance  Heat resistant  QTL mapping  Genetic overlap
基金项目:
作者单位E-mail
白海波 宁夏农林科学院农业生物技术研究中心 bai-haibo@163.com 
吕学莲   
   
   
马斯霜   
李树华   
董建力 宁夏农林科学院农业生物技术研究中心 jianli56@163.com 
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中文摘要:
      为了发掘控制小麦抗旱耐热基因位点,以小麦重组自交系(RILs)群体为材料,2015~2017年进行小麦灌浆期旱胁迫、热胁迫、旱+热胁迫处理,对抗旱耐热相关性状进行测定和QTL定位。结果表明,检测到灌浆期控制叶绿素含量、叶含水量、穗粒重、千粒重的QTL分别为27个、21个、26个和17个。灌浆期抗旱相关性状QTL位于2A、2B、3B、7B、3D、4D和7D染色体上,表型贡献率为9.38%~30.54%。灌浆期耐热相关性状QTL位于2A、3A、7A、3B、4B、7B 、4D、5D和6D染色体上,表型贡献率为9.03%~34.97%。发现抗旱性重叠位点2个,位于4B (wmc808-wmc78)、3D(wmc720-wmc331)染色体上,耐热性重叠位点2个,位于5D(cfd67-cfd40)、6D(barc196-barc54)染色体上,抗旱耐热性重叠位点4个,位于2A(gwm294-wmc644、382-gwm526)、2B(wmc441-wmc317)、7B(wmc83-wmc276)染色体上,重叠位点涉及“一因多效”或紧密连锁,有较高的表型贡献率和环境稳定性。小麦抗旱耐热性重叠位点gwm294-wmc644(Qcc-2A.2、Qrwc-2A.1)的贡献率大、遗传距离较小(6.49cM),可用于MAS和基因聚合育种,实现同时提高小麦的多抗性。
英文摘要:
      In order to find out the gene loci controlling drought resistance and heat resistance in wheat, recombinant inbred lines (RILs) of wheat were constructed by hybridization of water-land heat-resistant. From 2015 to 2017, drought stress, heat stress and drought + heat stress were treated during wheat grain-filling period, the traits related to drought and heat resistance were determined and QTL was located. Results show that ,there were 27, 21, 26 and 17 QTLS controlling chlorophyll content, leaf moisture content, panicle grain weight and 1000-grain weight during grouting. QTLS for drought-related traits at grout stage were located on chromosomes 2A, 2B, 3B, 7B, 3D, 4D and 7D,with the phenotypic contribution rate of 9.38%~30.54%. QTLS for heat-resistant traits at grout stage were located on chromosomes 2A, 3A, 7A, 3B, 4B, 7B, 4D, 5D and 6D, with the phenotypic contribution rate of 9.03%~34.97%%. Tgwo overlapping drought-resistant loci were found, located on chromosomes 4B (wmc808-wmc78) and 3D (wmc720-wmc331),tgwo heat-resistant overlap sites were located on chromosomes 5D (cfd67-cfd40) and 6D (barc196-barc54).,there were 4 overlapping sites of drought-resistance and heat-resistance, located on chromosome 2A (gwm294-wmc644, 382-gwm526), 2B (wmc441-wmc317) and 7B (wmc83-wmc276). The overlapping sites involved in "one - cause multiple effect" or tight linkage had high phenotypic contribution rate and environmental stability. The overlapping sites involved in "one - cause multiple effect" or tight linkage had high phenotypic contribution rate and environmental stability. It can be used in MAS and gene polymerization breeding to increase multiresistance of wheat at the same time.
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