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Abstract Detail

Systematics Section/ASPT

Neubig, Kurt [1], Blanchard, Orland [1], Mcdaniel, Stuart [2].

Congruence of chromosome pairing in experimental hybrids with DNA-based phylogenetic distance in Kosteletzkya (Malvaceae).

Historically, relationships among organisms were inferred using morphology and interfertility, however it is unclear how these data relate to our modern understanding of phylogenetics. Here we test that supposition in Kosteletzkya C. Presl (Malvaceae, Hibisceae), which includes 17 species, 5 of which are polyploids. The species are about evenly distributed between Africa and the New World. Chromosome pairing (x=19) at meiosis has been studied in 51 interspecific experimental hybrids. The seven New World species—all diploids—were found to exhibit nearly complete pairing among themselves, indicating that they share a genome, designated B. One African diploid (K. buettneri) pairs well with the New World species. The remaining two African diploids (K. adoensis--genome A and K. grantii--genome G) have poor chromosome pairing affinities with all B-genome species and with each other. Here, both nuclear and plastid data were sequenced for all of the same species in order to create a DNA-based phylogenetic framework with which to compare to the relationships inferred from chromosome pairing in experimental hybrids. DNA-based phylogenetic distance and chromosome-pairing data are largely congruent and show that pairing affinities are a good measure of phylogenetic proximity, at least within Kosteletzkya. That is, degree of chromosome pairing at meiosis among interspecific hybrids is negatively correlated with phylogenetic distance.

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1 - University of Florida, Florida Museum of Natural History, Gainesville, FL, 32611, USA
2 - University of Florida, Biology Department, Gainesville, FL, 32611, USA

chromosome pairing

Presentation Type: Oral Paper:Papers for Sections
Session: 19
Location: Napoleon Ballroom/Riverside Hilton
Date: Tuesday, July 30th, 2013
Time: 9:30 AM
Number: 19005
Abstract ID:320
Candidate for Awards:None

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