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Abstract Detail

Genetics Section

Levsen, Nicholas [1], Smith, Matthew S. [1], Olson, Matthew S. [1].

Linkage Disequilibrium Decay in Populus balsamifera (Salicaceae): a comparison between autosomes and sex chromosomes.

Linkage disequilibrium (LD) is the “nonrandom association of alleles at different loci” and LD levels can be influenced by population history, selection, breeding system, admixture, and linkage. In obligate outcrossers, such as the dioecious species Populus balsamifera, recombination rates are typically high and thus, LD is expected to decay quickly (< 500 bp). However, a preliminary investigation of LD in P. balsamifera, utilizing 590 loci (~ 600 bp), found no appreciable LD decay within the length of the sequenced loci. We resequenced loci at distances of 1-10 kb from 20 of the 590 previously described loci in order to more accurately assess levels of LD in P. balsamifera. In addition, we compare the estimates of LD from these autosomal regions to those found on the sex chromosome (chromosome 19), which has been shown to exhibit low levels of recombination.

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1 - University of Alaska Fairbanks, Institute of Arctic Biology, 902 Koyukuk Drive, Fairbanks, AK, 99775, USA

Linkage disequilibrium
Populus balsamifera
sex chromosome

Presentation Type: Oral Paper:Papers for Sections
Session: 22
Location: 553B/Convention Center
Date: Monday, August 2nd, 2010
Time: 4:00 PM
Number: 22002
Abstract ID:405

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