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Abstract Detail


Genetics Section

Small, Randall [1], Lickey, Edgar [1], Baxter, Holly [1], Osborne, Katie [1].

Patterns of nucleotide diversity in five thigmomorphogenetic-responsive loci in Arabidopsis thaliana.

PLANT responses to their environment are mediated through numerous pathways. One of these, the thigmomorphogenetic ("touch-response") pathway includes the upregulation of transcription of several tch genes, many of which encode calmodulin or calmodulin-like proteins. As part of an overall program to characterize the thigmomorphogenetic response in Arabidopsis we have sequenced two chromosomal regions that contain a total of five tch genes (CaBP22, TCH1, TCH3 on chromosome 2; CaM, TCH2 on chromosome 5). Sequences were obtained from individuals representing 30 wild-collected Arabidopsis populations from Europe. Levels of nucleotide diversity vary considerably among genes, as do patterns of synonymous and non-synonymous variation. Little phylogeographic signal is detected among the sequences, although intrapopulational variation is generally absent. Patterns of nucleotide variation are being used to detect conserved promoter regions, and to search for the genetic basis of variation in gene expression and phenotype.


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1 - University of Tennessee, Department of Ecology and Evolutionary Biology, 442 Hesler Biology, Knoxville, Tennesee, 37996, USA

Keywords:
Arabidopsis thaliana
nucleotide diversity
tch gene
calmodulin.

Presentation Type: Oral Paper:Papers for Sections
Session: 55-5
Location: 268/Holt
Date: Tuesday, August 1st, 2006
Time: 3:00 PM
Abstract ID:729


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