Genetic, Phenotypic, and Pathogenic Variation Among Athelia rolfsii, the Causal Agent of Peanut Stem Rot in China

Yan, L and Song, W and Yu, D and Sudini, H K and Kang, Y and Lei, Y and Huai, D and Wang, Z and Chen, Y and Wang, X and Liao, B (2022) Genetic, Phenotypic, and Pathogenic Variation Among Athelia rolfsii, the Causal Agent of Peanut Stem Rot in China. Plant Disease, 106 (10). ISSN 1943-7692

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Peanut stem rot caused by Athelia rolfsii is a serious soilborne disease worldwide and is becoming increasingly important in China. A total of 293 A. rolfsii isolates were collected from four representative peanut producing provinces in northern, central, and southern China. These isolates were assigned to 45 mycelial compatibility groups (MCGs) through pairing testing. The MCG diversity among isolates was greater in the southern sampled provinces compared with the northern provinces. A high level of genetic variability was found among the isolates from Guangdong Province in southern China. Variations were found in mycelial growth rate and sclerotial number, size, and dry weight of isolates sampled from places in different latitudes. Size and dry weight of sclerotia were positively correlated with latitude (P < 0.01), but the number of sclerotia was negatively correlated with latitude (P < 0.01). All tester isolates were pathogenic on peanut but varied in disease index. Inter-simple sequence repeat analysis and unweighted pair-group method with arithmetic average clustering resulted in three distinct clusters that were associated with the geographical location of the collection sites and sclerotial traits but were not associated with virulence of these isolates. These findings imply that genetic diversity, morphological traits, and virulence among A. rolfsii isolates varied in diverse geographical regions in China, and genetic diversity and sclerotial traits might be affected by latitude.

Item Type: Article
Divisions: Research Program : Asia
Uncontrolled Keywords: Athelia rolfsii, ISSR, MCG, morphological characteristics, pathogenicity, peanut
Subjects: Others > Plant Protection
Mandate crops > Groundnut
Others > Plant Pathology
Depositing User: Mr Nagaraju T
Date Deposited: 26 Oct 2023 10:30
Last Modified: 26 Oct 2023 10:40
Official URL:
Projects: Grant/Award Number: 31971820
Funders: National Natural Science Foundation of China, China Agriculture Research System of MOF and MARA
Acknowledgement: UNSPECIFIED
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