Genetic Structure and Aggressiveness of Rhizoctonia solani AG1-IA, the Cause of Sheath Blight of Rice in Southern China

文献类型： 外文期刊

第一作者： Wang, Ling

作者： Wang, Ling;Liu, Lian Meng;Wang, Zhi Gang;Huang, Shi Wen

作者机构：

关键词： aggressiveness;genetic structure;random amplified polymorphic DNA;Rhizoctonia solani;rice sheath blight

期刊名称：JOURNAL OF PHYTOPATHOLOGY （ 影响因子：1.789； 五年影响因子：1.574 ）

ISSN： 0931-1785

年卷期： 2013 年 161 卷 11-12 期

页码：

收录情况： SCI

摘要： One hundred and eighty isolates of Rhizoctonia solani AG1-IA, the causal agent of rice sheath blight, were obtained from six locations in southern China. The genetic structure of R.solani isolates was investigated using random amplified polymorphic DNA (RAPD) markers, and a considerable genetic variation among R.solani isolates was observed. Most of the genetic diversity was distributed within populations, rather than among them. The distribution pattern of the genetic variation of R.solani appears to be the result of high gene flow (Nm) and low-genetic differentiation among populations. The aggressiveness of R.solani was visually assessed by rice seedlings of five different cultivars in the glasshouse. All isolates tested were found to induce significantly different levels of disease severity, reflecting considerable variation in aggressiveness. The isolates were divided into highly virulent, moderately virulent and weakly virulent groups, and the moderately virulent isolates were dominant in R.solani population. No significant correlation was observed among the genetic similarity, pathogenic aggressiveness and geographical origins of the isolates. Information obtained from this study may be useful for breeding for improved resistance to sheath blight.

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