A novel and major quantitative trait locus for fusarium crown rot resistance in a genotype of Wild Barley (Hordeum spontaneum L.).
A novel and major quantitative trait locus for fusarium crown rot resistance in a genotype of Wild Barley (Hordeum spontaneum L.).
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DOI：
10.1371/journal.pone.0058040
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发表时间：
2013
期刊：
影响因子：
3.7
通讯作者：
Liu C
中科院分区：
文献类型：
--
作者：
Chen G;Liu Y;Ma J;Zheng Z;Wei Y;McIntyre CL;Zheng YL;Liu C
镰刀菌冠腐病（Fusarium crown rot，FCR）是由镰刀菌属（Fusarium）引起的一种严重危害世界半干旱地区粮食作物的病害。作为我们对镰刀菌抗性品种开发贡献的一部分，我们通过系统评估代表不同地理起源和植物类型的大麦基因型，确定了几种新的抗性来源。在这项研究中，通过产生和分析两个群体的重组自交系的抗性来源之一进行了研究。在其中一个群体（作图群体）中检测到一个赋予FCR抗性的主效位点，命名为Qcrs.cpi-4 H，并且在另一个群体中证实了QTL的效应。该QTL定位于染色体臂4 HL的远端，对两个供试镰刀菌分离物均有效，其中一个为F. pseudograminearum和F.禾谷早熟禾QTL解释了高达45.3%的表型变异。与先前的报道不同，该报道证明了大麦中赋予FCR抗性和株高的基因座的共位，在作图群体中未检测到这两个性状之间的相关性。然而，在随机基因型筛选中观察到，FCR抗性与植物生长速率之间的关联被检测到，并且在作图群体中的Qcrs.cpi-4 H位点附近检测到控制后者的QTL。现有的数据表明，虽然生长速率可能会影响FCR抗性，但该位点的不同基因可能参与控制这两个性状。
Fusarium crown rot (FCR), caused by various Fusarium species, is a destructive disease of cereal crops in semiarid regions worldwide. As part of our contribution to the development of Fusarium resistant cultivars, we identified several novel sources of resistance by systematically assessing barley genotypes representing different geographical origins and plant types. One of these sources of resistance was investigated in this study by generating and analysing two populations of recombinant inbred lines. A major locus conferring FCR resistance, designated as Qcrs.cpi-4H, was detected in one of the populations (mapping population) and the effects of the QTL was confirmed in the other population. The QTL was mapped to the distal end of chromosome arm 4HL and it is effective against both of the Fusarium isolates tested, one F. pseudograminearum and the other F. graminearum. The QTL explains up to 45.3% of the phenotypic variance. As distinct from an earlier report which demonstrated co-locations of loci conferring FCR resistance and plant height in barley, a correlation between these two traits was not detected in the mapping population. However, as observed in a screen of random genotypes, an association between FCR resistance and plant growth rate was detected and a QTL controlling the latter was detected near the Qcrs.cpi-4H locus in the mapping population. Existing data indicate that, although growth rate may affect FCR resistance, different genes at this locus are likely involved in controlling these two traits.
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影响因子：
5.4
作者：
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