Journal
FUNGAL BIOLOGY
Volume 116, Issue 3, Pages 343-353Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.funbio.2011.12.001
Keywords
Lasiodiplodia; Microsattelites; Population diversity; Taxonomy; Taungya; Terminalia; Cacao
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Funding
- DST/NRF Centre of Excellence in Tree Health Biotechnology (CTHB)
- University of Pretoria, South Africa
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In this study, we determined the genetic diversity of 126 isolates representing both Lasiodiplodia theobromae and Lasiodiplodia pseudotheobromae, collected from Theobroma cacao and Terminalia spp. in Cameroon, using simple sequence repeat (SSR) markers. SSR alleles showed clear genetic distinction between L. theobromae and L. pseudotheobromae, supporting their earlier separation as sister species. Both L. theobromae and L. pseudotheobromae populations from Cameroon had high levels of gene diversity, moderate degrees of genotypic diversity, and high levels of gene flow between isolates from T. cacao and Terminalia spp. There was no evidence for geographic substructure in these populations across the region studied, and the SSR alleles were randomly associated in both species, suggesting outcrossing. The significant levels of aggressiveness, evolutionary potential represented by high levels of diversity, outcrossing and gene flow between geographically and host defined populations, identify these fungi as high-risk pathogens for their native and non-native hosts in Cameroon. (C) 2011 The British Mycological Society. Published by Elsevier Ltd. All rights reserved.
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