PREDOMINANCE OF A SINGLE MAJOR GENE FOR RESISTANCE TO PHAKOPSORA-PACHYRHIZI IN A POPULATION OF GLYCINE-ARGYREA
PREDOMINANCE OF A SINGLE MAJOR GENE FOR RESISTANCE TO PHAKOPSORA-PACHYRHIZI IN A POPULATION OF GLYCINE-ARGYREA
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DOI：
10.1038/hdy.1990.43
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发表时间：
1990-06-01
期刊：
影响因子：
3.8
通讯作者：
BURDON, JJ
中科院分区：
文献类型：
--
作者：
JAROSZ, AM;BURDON, JJ
在从银棉种群的 49 株植物收集的种子衍生的 104 个品系中，发现了对 9 个豆薯小种的四种抗性和易感性表型模式。遗传分析表明，三种最常见的表型模式是由单个基因座的两个等位基因决定的。四种表型模式仅由一个未进行遗传分析的品系代表。这些结果与相关物种 G. canescens 的结果形成鲜明对比，G. canescens 在两个种群中的每一个中检测到十个或更多抗性基因，并且个体通常拥有两个或更多抗性基因。据推测，G. argyrea 相对较高的异交率和明显流行的抗性形式延迟了病原体的发展，可能导致该群体中主要抗性基因的数量较少。
Four phenotypic patterns of resistance and susceptibility to nine races of P. pachyrhizi were found among 104 lines derived from seeds collected from 49 plants of a G. argyrea population. Genetic analyses suggested that the three most common phenotypic patterns were determined by two alleles at a single locus. The four phenotypic pattern was represented by only a single line which was not analyzed genetically. These results contrast with those of a related species, G. canescens, where ten or more resistance genes were detected within each of two populations, and individuals often possessed two or more resistance genes. It is postulated that G. argyrea''s relatively high rate of outcrossing and the apparent prevalence of forms of resistance which delay the development of the pathogen may have contributed to the small number of major resistance genes in this population.