Abstract
The causal agents of mango malformation disease in Brazil are a new Fusarium lineage in the Gibberella fujikuroi species complex and Fusarium sterilihyphosum; however information on the genetic and geographical diversity of these pathogens in Brazil is missing. Vegetative compatibility group (VCG) and amplified fragment length polymorphism (AFLP) analyses were used to measure the genetic diversity within these populations. Both techniques identified the same genetic groups. Six VCG and AFLP groups were identified amongst isolates of the new lineage from Brazil. FB-VCG 1/AFLP I was the most widespread group, found in seven of the 13 sites sampled. The second most frequent group was recovered from three sites. The remaining four groups were recovered from single-sites. We think that this lineage represents a genetically and geographically diverse indigenous population that reproduces clonally. In F. sterilihyphosum, group FS-VCG 1/AFLP VII was found at three sites in the southeast region of Brazil. FS-VCG 2/AFLP VIII contained isolates from South Africa but not from Brazil. Fusarium mangiferae isolates from India and South Africa formed one group, while isolates from Egypt and the USA formed a second group. F. sterilihyphosum at present is represented by a small population that might have been introduced only once into a restricted area. The clonal nature of the observed populations suggests that these fungi either occur naturally on indigenous hosts and have jumped to the introduced mango host (introduced in Brazil) or that they originated with mango and went through a severe population bottleneck when they were introduced to Brazil from India or Southeast Asia.
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Acknowledgements
We thank Amgad Saleh, Amy Beyer, Brook van Scoyoc and Edson Luis Resende for technical assistance and Walter F. O. Marasas, Helgard Nirenberg, Gustavo Mora-Aguilera and Daniela Lopes for providing isolates and/or plant material with mango malformation. This research was supported by Fundação de Amparo a Pesquisa de Minas Gerais (FAPEMIG-Brazil CAG 1096-03), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES-Brazil) and Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq-Brazil), and the Kansas Agricultural Experiment Station. Manuscript no. 08-51-J from the Kansas Agricultural Experiment Station, Manhattan.
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Lima, C.S., Monteiro, J.H.A., Crespo, N.C. et al. VCG and AFLP analyses identify the same groups in the causal agents of mango malformation in Brazil. Eur J Plant Pathol 123, 17–26 (2009). https://doi.org/10.1007/s10658-008-9333-y
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DOI: https://doi.org/10.1007/s10658-008-9333-y