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Evidence of Chloroplast Capture and Pollen-Mediated Gene Flow in Penstemon sect. Peltanthera (Scrophulariaceae)

Authors :
Wayne J. Elisens
Andrea D. Wolfe
Source :
Systematic Botany. 20:395
Publication Year :
1995
Publisher :
JSTOR, 1995.

Abstract

Restriction-site variation of chloroplast DNA was used to assess hypotheses of diploid hybrid speciation in Penstemon sect. Peltanthera where P. spectabilis is a putative stabilized hybrid of P. centranthifolius and P. grinnellii, and P. clevelandii is a purported hybrid derivative of P. centranthifolius and P. spectabilis. Based on restriction-site mapping, cpDNA haplotypes were determined for hy- pothesized parental species and P. spectabilis and P. clevelandii. The distribution of nuclear and organellar DNA markers among populations of P. spectabilis and P. clevelandii were evaluated to determine whether the observed patterns result from diploid hybrid speciation, or from introgres- sion. Nuclear markers of P. centranthifolius were found in several populations of P. grinnellii, P. spectabilis, and P. clevelandii; whereas chloroplast haplotypes of P. centranthifolius were found in only two populations of P. grinnellii. We suggest that the patterns of introgression observed for sect. Peltanthera result predominantly from pollen-mediated gene flow, with hummingbirds the most likely vector. A comparison of the phylogenetic trees based on cpDNA vs. nuclear restriction data reveals that at least one chloroplast-capture event has occurred in Penstemon sect. Peltanthera.

Details

ISSN :
03636445
Volume :
20
Database :
OpenAIRE
Journal :
Systematic Botany
Accession number :
edsair.doi...........3904b457ea3dc15659e1b8d94ecc03e4
Full Text :
https://doi.org/10.2307/2419800