Relationships and dispersal of the Caribbean species of Harrisia (sect. Harrisia; Cactaceae) using AFLPs and seven DNA regions

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Abstract:

The cactus genus Harrisia contains 18 species, of which 11 are native to the Caribbean region. To evaluate species relationships, specimens of Harrisia were examined morphologically, sequenced for seven DNA regions (four nuclear, three plastid), and surveyed for additional polymorphisms using ten sets of AFLP primers. The analyses show that H. earlei is an isolated lineage, sister to the remaining ten species. The remaining ten species comprised three groups in the molecular analyses—a Cuba group, Florida group, and a southern/eastern Greater Antilles-Bahamas (SEGAB) group. Morphology suggests the Florida group is related to species of west Cuba and the SEGAB group is related to species of east Cuba. Harrisia likely first colonized west Cuba and then dispersed northeastward and southeastward.

Keywords: AFLP; BIOGEOGRAPHY; CARIBBEAN; HARRISIA; PHYLOGENY; YCF1

Document Type: Research Article

DOI: http://dx.doi.org/10.12705/623.5

Affiliations: 1: Department of Cell Biology, Microbiology, and Molecular Biology, University of South Florida, 4202 E. Fowler Avenue, Tampa, Florida 33620, U.S.A. 2: Department of Zoology, Miami University, 212 Pearson Hall, 501 E. High Street, Oxford, Ohio 45056, U.S.A. 3: Department of Cell Biology, Microbiology, and Molecular Biology, University of South Florida, 4202 E. Fowler Avenue, Tampa, Florida 33620, U.S.A.;, Email: garey@usf.edu

Publication date: June 17, 2013

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