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Characterization of Alternaria species associated with watermelon leaf blight in Beijing municipality of China

Author:
Zhao, J., Bao, S. W., Ma, G. P., Wu, X. H.
Source:
Journal of plant pathology 2016 v.98 no.1 pp. 135-138
ISSN:
1125-4653
Subject:
Alternaria tenuissima, disease incidence, genes, histones, leaf blight, leaves, phylogeny, sequence analysis, watermelons, China
Abstract:
Leaf blight symptoms consisting of dark brown lesions were observed on watermelon plants in seven districts or counties in Beijing municipality of China. A total of 64 Alternaria isolates were recovered and identified based on morphological characters and sequence analyses of rDNA-ITS regions and histone 3 genes. Amongst these isolates, Alternaria tenuissima was the most prevalent species representing 76.6% of the isolates, followed by A. alternata (23.4%). All isolates were divided into individual clades representing two species, A. tenuissima and A. alternata, according to phylogenetic analysis of histone 3 gene. Representative Alternaria isolates of the two species induced dark brown lesions on detached watermelon leaves, with disease incidence ranging from 44.4-83.3%. These results allowed the identification of the presence of Alternaria populations causing watermelon leaf blight for the first time in Beijing municipality of China.
Agid:
5339361