A study on the susceptibility of rice cultivars to Striga hermonthica and mapping of Striga tolerance quantitative trait loci in rice
A study on the susceptibility of rice cultivars to Striga hermonthica and mapping of Striga tolerance quantitative trait loci in rice
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DOI：
10.1111/j.1469-8137.2008.02568.x
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发表时间：
2008-10-01
期刊：
影响因子：
9.4
通讯作者：
Price, Adam H.
中科院分区：
文献类型：
--
作者：
Kaewchumnong, Krittika;Price, Adam H.
独脚金是一种寄生杂草，主要危害玉米、高粱、小米和豇豆。研究水稻和独脚金之间的相互作用很有价值，因为水稻是一种模式单子叶植物。本文测试了不同水稻品种对 Hermonthica 的敏感性，并在 Bala x Azucena F-6 群体上绘制了独脚金耐受性数量性状位点 (QTL)。 7 个水稻品种在有和没有 Hermonthica 的情况下生长 14 周。对于绘图实验，115 个重组自交系 (RIL) 以及 Azucena 和 Bala 在有或没有独脚金的情况下生长 11 周。测试的水稻品种对独脚金具有不同的敏感性，从高度敏感到完全抗性。 Azucena 和 Bala 的不同之处在于独脚金的出现速度和对寄主生长的影响。 1号染色体139和166 cM位置之间的基因组区域被鉴定为所有测量性状均含有强QTL（LOD = 4.9-15.7）。这表明水稻种质中存在独脚金耐受基因，可以进一步研究定位的QTL，以促进对独脚金抗性作物植物的抗性/耐受性和育种的理解。
Striga is a parasitic weed attacking mainly maize, sorghum, millet and cowpea. Studying the interaction between rice and Striga is valuable since rice is a model monocot. In this paper, the susceptibility of different rice cultivars to S. hermonthica was tested and quantitative trait loci (QTL) for Striga tolerance mapped on the Bala x Azucena F-6 population.Seven rice cultivars were grown with and without S. hermonthica for 14 wk. For the mapping experiment, 115 recombinant inbred lines (RILs), along with Azucena and Bala, were grown with and without Striga for 11 wk.Rice cultivars tested had different susceptibilities to Striga, ranging from highly susceptible to completely resistant. Azucena and Bala differed in the speed of Striga emergence and the impact on host growth. A genomic region between positions 139 and 166 cM on chromosome 1 was identified containing strong QTL (LOD = 4.9-15.7) for all traits measured.This indicates that genes for Striga tolerance exist in rice germplasm and the mapped QTL can be further studied to promote understanding of the nature of resistance/tolerance and breeding for Striga-resistant crop plants.