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  2011, Vol. 25 Issue (2): 206-202     DOI: 10.3969/j.issn.1001-7216.2011.02.014
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Studies on Biological Characteristics and Pathogenicity Differentiation of Rice Sheath Blight Pathogen from Three Provinces in South China
ZOU Cheng-jia#, TANG Fang# , YANG Mei, HE Xiao-xia, LI Xian-jun, ZHOU Er-xun*
(College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China; #These authors contributed equally to this paper; *Corresponding author, E-mail:
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Abstract In order to elucidate the relationship among the biological characteristics, pathogenicity and geographic origin of isolates of Rhizoctonia solani, the causal agent of rice sheath blight, so as to provide evidences for controlling the disease in South China, with a total of 335 isolates of R. solani collected from 33 counties of 3 provinces (Guangdong, Guangxi and Hainan) in South China, cultural characteristics (hyphal growth rate, colony colour and sclerotium number), hyphal anastomosis groups, number of hyphal cell nuclei and pathogenicity differentiation were investigated. The hyphal growth rates could be divided into three types, i.e. slow, moderate and fast, with isolate numbers of 3, 136 and 196, which accounted for 0.90%, 40.60% and 58.50% of the total isolates, respectively. The number of sclerotia produced on PDA medium in all the isolates could be divided into four different types, i.e. absence or rare, less, moderate and abundant sclerotia, which accounted for 1.19%, 17.61%, 71.04% and 10.15% of the total isolates, respectively. The anastomosis grouping confirmed that all the tested isolates belonged to AG-1ⅠA of R. solani. The hyphal cell nuclear numbers of the 50 randomly selected isolates were between 7 and 13. The 270 tested isolates could be divided into only two pathotypes, i.e. moderate and high virulence with isolate numbers of 208 and 62, which accounted for 77.04% and 22.96%, respectively, no isolate with weak virulence was found. Taken together, the results revealed that there existed differences in pathotype and hyphal growth rate as well as the number of sclerotia among the tested isolates, showing more diversity.
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ZOU Cheng-jia#
TANG Fang#
HE Xiao-xia
LI Xian-jun
ZHOU Er-xun*
Key wordsRhizoctonia solani   cultural characteristics   hyphal anastomosis group   pathogenicity differentiation     
Received: 2010-04-01;
Cite this article:   
ZOU Cheng-jia#,TANG Fang# ,YANG Mei et al. Studies on Biological Characteristics and Pathogenicity Differentiation of Rice Sheath Blight Pathogen from Three Provinces in South China[J]. , 2011, 25(2): 206-202 .
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