As a result of hybridization, the Florida population does not exhibit low genetic variation compared to populations in the native range, possibly increasing its ability to adapt to novel environments. The west coast genotype likely came from coastal Brazil at about 27 south, whereas the east coast genotype probably originated from another, as yet unidentified site. We conclude that the genetic evidence supports two introductions of Brazilian peppertree into Florida and extensive hybridization between them. Analysis of samples collected in South America shows that haplotypes as distinct as the two in Florida are unlikely to have come from a single source population. The two chloroplast haplotypes found in Florida are also concordant with this separation: one predominates on the east coast, the other on the west coast. Bayesian clustering of microsatellite data separates the east and west coast plants in Florida into distinct populations. Nuclear microsatellite and cpDNA loci reveal strong genetic population structure consistent with limited dispersal in the introduced and native ranges. We sampled plants from the native and exotic ranges, particularly Florida, and genotyped these individuals at nuclear and chloroplast loci. Our goals were to understand the history of this invasion, as one step toward understanding why this exotic was so successful, and ultimately to improve development of biological control agents. It was recorded as an invader of natural areas in the 1950s, and has since extended its range to cover over 280 000 ha. This native of northeastern Argentina, Paraguay, and Brazil was brought as an ornamental to both the west and east coasts of Florida at the end of the 19th century. procumbens in Thailand may have been facilitated by the genotype with strong competitive ability.īrazilian peppertree (Schinus terebinthifolius) is a woody perennial that has invaded much of Florida. procumbens across Thailand indicating all accessions likely consist of the same genotype.
The genetic uniformity was detected in T. The detection of genetic variation from all 77 provinces across Thailand by using 20 ISSR (Inter simple sequence repeats) primer produced a total of 125 fragments with an average of 6.25 per primer and using 25 SRAP (Sequence related amplified polymorphism) primer combinations produced a total of 259 fragments with an average of 10.36 per primer combination. The present study aims to elucidate the invasion mechanisms of Tridax procumbens, a native of America while a weed in many parts of tropical and subtropical regions in the world,īy utilizing molecular marker to detect genetic characteristics in order to help understand its distribution and to develop effective management strategies. Management proceedings that prevent the spread and impacts of such a species require information of their ecological and genetic studies. Invasive alien species is considered as a major threat to ecosystem integrity and global biodiversity.
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