Abstract
Colletotrichum gloeosporioides sensu lato is one of the most common and widely distributed plant pathogens in the world. Understanding fungal biodiversity is hinged on accurate identification and delimitation at the inter- and intraspecific levels. Sequences of the ITS1-5.8S-ITS2 region (ITS), β-tubulin (TUB), actin (ACT), and glyceraldehyde-3-phosphate dehydrogenase (GPDH) genes of 30 C. gloeosporioides sensu lato isolates, collected from anthracnose infected papaya fruits grown in the main production areas in Trinidad, were analyzed by in silico PCR-RFLP analysis with the aim of identifying which gene region(s) had the highest level of intraspecific polymorphism. Restriction site polymorphisms generated from 13 restriction enzymes enabled the identification of specific enzymes that were successful at intraspecific discrimination of the C. gloeosporioides isolates. Genetic distance values were reflective of the level of polymorphisms obtained for the four different gene regions. In both cases (calculated genetic distance and percentage of polymorphic loci from RFLP profiles), ACT and ITS gene regions had the highest level of restriction site polymorphisms and genetic diversity, GPDH and TUB had the lowest. Cluster analysis based on PCR-RFLP genetic distance data revealed sub-specific placement of the isolates which appeared to be gene-dependent. The implications of these findings are discussed relative to biodiversity monitoring and the need for multilocus, polyphasic investigations which must take into account the possibility of exaggerated estimates of genetic diversity.
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This study was funded by the University of the West Indies, St. Augustine Campus Research and Publications Grant (Grant No. CRP.3.NOV11.8).
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Ramdeen, S., Rampersad, S.N. Intraspecific Differentiation of Colletotrichum gloeosporioides sensu lato Based on In Silico Multilocus PCR-RFLP Fingerprinting. Mol Biotechnol 53, 170–181 (2013). https://doi.org/10.1007/s12033-012-9509-8
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DOI: https://doi.org/10.1007/s12033-012-9509-8