Population structure, pathogenicity, and fungicide sensitivity of Colletotrichum siamense from different hosts in Hainan, China. (11th March 2021)

• Record Type: Journal Article
• Authors: Cao, Xueren; Zhu, Zijiao; Che, Haiyan; West, Jonathan S.; Lin, Yating; Luo, Daquan; Xu, Xiangming
• Is Part Of: Plant pathology. Volume 70:Number 5(2021)
• Page Start: 1158
• Page End: 1167
• Publication Date: 2021-03-11
• Subjects: Colletotrichum siamense -- fungicide sensitivity -- pathogenicity -- population structure; Agricultural pests -- Periodicals; Plant diseases -- Periodicals; 632
• DOI: 10.1111/ppa.13361
• Languages: English
• ISSNs: 0032-0862

Abstract

Abstract: Areca palm, rubber tree, and coffee are always planted adjacent to each other or intercropped with each other, and Colletotrichum siamense was found to be the dominant species of Colletotrichum from these crops in Hainan, China. To study the population structure, pathogenicity, and fungicide sensitivity of C. siamense from these three crops in Hainan, isolates were first identified by their morphological characteristics and multilocus phylogeny. Then both permutational multivariate analysis of variance (PERMANOVA) and pairwise F ST analysis showed that the original host and geographical origin (counties) had significant effects on genetic variation in the C. siamense population, explaining 5.6% and 16.3% of genetic variation, respectively. There were significant genetic differentiations between coffee and rubber tree populations but the genetic differentiation was small ( F ST = 0.04), while significant differentiations were observed among all populations from different counties except those between Haikou and Chengmai. Pathogenicity analysis using artificial inoculation showed that isolates had significantly higher disease incidence and diseased lesion diameter on wounded leaves than on nonwounded leaves. However, the original host of an isolate and geographical origin did not significantly affect the pathogenicity of the C. siamense populations from these three hosts. In vitro tests showed that there were no significant differences in the sensitivity of C. siamense populations to carbendazim, prochloraz, difenoconazole, and propiconazole from different original hosts and geographical origins. The present study suggests that host specialization of C. siamense has not occurred yet in coffee, rubber tree, and areca palm. Abstract : Host specialization of Colletotrichum siamense has not occurred yet in coffee, rubber tree, and areca palm; disease management in these three crops can be made simultaneously in areas where they are grown close to each other.