<FONT face="Verdana">Pathogenicity Differentiation of   Rice Sheath Blight Pathogen Rhizoctonia solani  AG-1 ⅠA Isolates from Anhui and Hubei Provinces, China</FONT>

WANG   Ling,HUANG   Wen-wen,HUANG   Shi-wen,LIU   Lian-meng,LIU   En-yong,

doi:10.3969/j.issn.1001-7216.2010.06.010

2010 , Vol. 24 >Issue 6: 623 - 629

DOI: https://doi.org/10.3969/j.issn.1001-7216.2010.06.010

研究报告

Pathogenicity Differentiation of Rice Sheath Blight Pathogen Rhizoctonia solani AG-1 ⅠA Isolates from Anhui and Hubei Provinces, China

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¹China National Rice Research Institute, Hangzhou 310006, China； ²Agricultural College, Guangxi University, Nanning 530003, China； *Corresponding author, E-mail: swhuang666@sohu.com

Received date: 1900-01-01

Revised date: 1900-01-01

Online published: 2010-11-10

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Abstract

Pathogenicity variation of 200 isolates of rice sheath blight (SB) pathogen Rhizoctonia solani AG1 ⅠA from the infected samples from provinces of Anhui and Hubei, China were analyzed by using five cultivars with different resistance to SB at the seedling stage in greenhouse. There were significant differences in pathogenicity among these tested isolates of R. solani AG1 ⅠA. The frequency of average disease index followed a normal school distribution. Based on their disease indices to the five cultivars, the isolates were classified into three distinct pathotype groups by dynamic cluster analysis, i.e. weak, moderate and strong pathotypes, accounting for 29.5%, 60.5% and 10.0%, respectively. The moderate pathotypes were dominant. Random distribution of pathotypes in different areas implied that R. solani AG1 ⅠA population was a mixture of pathotypes naturally. The Mantel testing revealed that the pathogenicity variation was not obviously correlated with the collective location. The discriminant functions of the three pathotypes were constructed based on the Bayes method. The accurate rate for discrimination was up to 95.00%. The results indicate that dynamic cluster and discriminant analysis can be used to evaluate the pathogenicity differentiation of R. solani AG1 ⅠA.

Key words： Rhizoctonia solani; pathogenicity differentiation; cluster analysis; Bayes discrimination

Cite this article

WANG Ling,HUANG Wen-wen,HUANG Shi-wen,LIU Lian-meng,LIU En-yong, . Pathogenicity Differentiation of Rice Sheath Blight Pathogen Rhizoctonia solani AG-1 ⅠA Isolates from Anhui and Hubei Provinces, China[J]. Chinese Journal OF Rice Science, 2010 , 24(6) : 623 -629 . DOI: 10.3969/j.issn.1001-7216.2010.06.010

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