Existence of two genetically distinct populations of Colletotrichum gloeosporioides Penz in mango from India
Seventy nine isolates of Colletotrichum gloeosporioides representing all mango growing areas in India were collected and characterized based on morphological, species- specific PCR and sequence analysis of the internal transcribed spacer (ITS) region of r DNA. Based on cultural and morphological criteria of Colletotrichum gloeosporioides, 79 isolates were categorized into two groups designated respectively as slow growing grey (SGG) and fast growing grey type (FGG). Genetic variation, revealed by sequence analysis of ITS region and ITS RFLP patterns, were found between two morphological groups. Phylogenetic analysis based on the sequences of ITS region clearly separated into two distinct clusters. Pathogenicity assays on detached fruits of five varieties of mango confirmed the apparent difference between the groups of isolates. It is therefore concluded that the pathogen responsible for mango fruit rot anthracnose in India, belongs to two sub populations of C. gloeosporioides. The implications of these findings for C. gloeosporioides induced anthracnose control strategies and resistance breeding are discussed.
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