Journal
PLANT GENETIC RESOURCES-CHARACTERIZATION AND UTILIZATION
Volume 8, Issue 1, Pages 16-25Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S1479262109990098
Keywords
AFLP; Citrullus species; microsatellites; molecular phylogeny; watermelon
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Funding
- USDA-CSREES [2007-38814-18472, 2004-38814-15118]
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Thirty-one accessions of Citrullus spp belonging to Citrullus lanatus var lanatus, C lanatus var citroides and Citrullus colocynthis were subjected to phylogenetic analysis using combined datasets of amplified fragment length polymorphisms (AFLPs) and simple sequence repeats (SSRs) Tree topologies inferred by neighbour-Joining analysis have resolved the phylogenic relationships among the species with special reference to established taxonomic classification In this study, we have clearly resolved species boundaries of various taxa of citroides, lanatus and colocynthis into three well-supported clusters Clustering pattern of principal component analysis with the shared polymorphisms using the subsets of data between any two taxon combinations helped to elucidate the introgression and interrelationships among the species We report two major groups of C lanatus taxa, one of which has undergone wide introgressions with the taxa of C lanatus var citroides and C colocynthis In this paper, we identified 583 AFLP bands that are polymorphic within the var lanatus of C lanatus, which is the largest set ever reported The species-specific diagnostic SSRs and polymorphic AFLPs that are informative within and between the taxa reported in this paper would be immensely useful for future studies of these economically important genera
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