| Title | Genetic variation of Colletotrichum magnum isolated from Carica papaya as revealed by DNA fingerprinting |
|---|---|
| Author | Daisy Pérez-Brito1, Alberto Cortes-Velázquez1, Teresita Valencia-Yah1, Anuar Magaña-Álvarez1, Cuauhtémoc Navarro2, Blanca Moreno2, Steven Quiroga2, and Raúl Tapia-Tussell3* |
| Address | 1Laboratorio GeMBio, Centro de Investigación Científica de Yucatán A.C., Yucatán 97200, México, 2Nature Source Improved Plants de México SA de CV. Rancho El Rocío S/N, Chiapas 38850, México, 3Unidad de Energía Renovable, Centro de Investigación Científica de Yucatán A.C., Yucatán 97200, México |
| Bibliography | Journal of Microbiology, 56(11),813–821, 2018, |
| DOI | 10.1007/s12275-018-8215-z |
| Key Words | Colletotrichum magnum, Carica papaya, DNA fingerprinting, genetic variation |
| Abstract | Mexico is one of the five largest producers of papaya worldwide, but losses caused by pathogens, mainly fungus, at the pre- and post-harvest stages are often more than 50% of the crop. Papaya anthracnose, caused by three different species of the Colletotrichum genus in Mexico, occupies a preponderant place in this problem. Although two of these species, C. gloeosporiodes and C. truncatum, have been characterized morphologically and genotypically, this has not occurred with C. magnum, the third species involved, about which there is very little information. Because of this, it is vital to know its genetic characterization, much more so considering that the studies carried out on the other two species reveal a wide genetic diversity, differences in pathogenicity and in the response to fungicides of the different strains characterized. In this work, Colletotrichum spp. isolates were collected at different papaya orchards in the south-southeast of Mexico. C. magnum isolates identified by species-specific primers were characterized by morphological and molecular approaches. Differences in colony characteristics resulted in five morphological groups. AP-PCR, DAMD and ISSR markers were found to be very efficient for revealing the interspecific variability of this species. The high genetic variability found in the accessions of C. magnum was linked to the geographical area where they were collected. Isolates from Chiapas State were the most variable, showing point mutations in the ITS1- ITS2 region. These results will enable a better phytosanitary management of anthracnose in papaya in this region of Mexico. |