Variation of cassiicolin genes among Chinese isolates of Corynespora cassiicola

Jun Wu; Xuewen Xie; Yanxia Shi; Ali Chai; Qi Wang; Baoju Li

doi:10.1007/s12275-018-7497-5

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Variation of cassiicolin genes among Chinese isolates of Corynespora cassiicola: Jun Wu ^1,2, Xuewen Xie ¹, Yanxia Shi ¹, Ali Chai ¹, Qi Wang ², Baoju Li ¹; Journal of Microbiology 2018;56(9):634-647.
DOI: https://doi.org/10.1007/s12275-018-7497-5
Published online: July 27, 2018

¹Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing 10081, P. R. China, ²Department of Plant Pathology, China Agricultural University, Beijing 100094, P. R. China¹Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing 10081, P. R. China, ²Department of Plant Pathology, China Agricultural University, Beijing 100094, P. R. China

Corresponding author: Baoju Li , Tel: +86-10-62197975;,

Received: 15 November 2017 • Revised: 30 April 2018 • Accepted: 1 May 2018

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Abstract

Corynespora cassiicola is a species of fungus that is a plant pathogen of many agricultural crop plants, including severe target spot disease on cucumber. Cassiicolin is an important effector of pathogenicity of this fungus. In this study, we collected 141 Corynespora isolates from eighteen hosts, and the casscolin gene was detected in 82 C. cassiicola strains. The deduced protein sequences revealed that 72 isolates contained the Cas2 gene, two strains from Gynura bicolor harboured the Cas2.2 gene, and 59 isolates without a cassiicolin gene were classified as Cas0. Phylogenetic analyses was performed for the 141 isolates using four loci (ITS, ga4, caa5, and act1) and revealed two genetic clusters. Cluster A is composed of four subclades: subcluster A1 includes all Cas2 isolates plus 18 Cas0 strains, subcluster A2 includes the eight Cas5 isolates and one Cas0 isolate, and subclusters A3 and A4 contain Cas0 strains. Cluster B consists of 21 Cas0 isolates. Twenty-two C. cassiicola strains from different toxin classes showed varying degrees of virulence against cucumber. Cas0 or Cas2 strains induced diverse responses on cucumber, from no symptoms to symptoms of moderate or severe infection, but all Cas5 isolates exhibited avirulence on cucumber.

Keywords: Corynespora cassiicola;toxin class;phylogeny;nucleotide and protein sequence characterisations

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Variation of cassiicolin genes among Chinese isolates of Corynespora cassiicola

J. Microbiol. 2018;56(9):634-647. Published online July 27, 2018

DOI: https://doi.org/10.1007/s12275-018-7497-5

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