Genetics of drought adaptation in Arabidopsis thaliana: I. Pleiotropy contributes to genetic correlations among ecological traits

Mckay, J.K. and Richards, J.H. and Mitchell-Olds, T. (2003) Genetics of drought adaptation in Arabidopsis thaliana: I. Pleiotropy contributes to genetic correlations among ecological traits. Molecular Ecology, 12 (5). pp. 1137-1151.

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Abstract

We examined patterns of genetic variance and covariance in two traits (i) carbon stable isotope ratio δ13 C (dehydration avoidance) and (ii) time to flowering (drought escape), both of which are putative adaptations to local water availability. Greenhouse screening of 39 genotypes of Arabidopsis thaliana native to habitats spanning a wide range of climatic conditions, revealed a highly significant positive genetic correlation between δ13 C and flowering time. Studies in a range of C3 annuals have also reported large positive correlations, suggesting the presence of a genetically based trade-off between mechanisms of dehydration avoidance (δ13 C) and drought escape (early flowering). We examined the contribution of pleiotropy by using a combination of mutant and near-isogenic lines to test for positive mutational covariance between δ13 C and flowering time. Ecophysiological mutants generally showed variation in δ13 C but not flowering time. However, flowering time mutants generally demonstrated pleiotropic effects consistent with natural variation. Mutations that caused later flowering also typically resulted in less negative δ13 C and thus probably higher water use efficiency. We found strong evidence for pleiotropy using near-isogenic lines of FRIGIDA and FLOWERING LOCUS C , cloned loci known to be responsible for natural variation in flowering time. These data suggest the correlated evolution of δ13 C and flowering time is explained in part by the fixation of pleiotropic alleles that alter both δ13 C and time to flowering

Item Type: Article
Author Affiliation: Biological Sciences, University of Montana, Missoula, USA
Subjects: Crop Improvement > Genetics/Genomics
Divisions: Other Crops
Depositing User: Ms K Syamalamba
Date Deposited: 17 Jul 2012 05:37
Last Modified: 17 Jul 2012 05:37
Official URL: http://dx.doi.org/10.1046/j.1365-294X.2003.01833.x
URI: http://eprints.icrisat.ac.in/id/eprint/6810

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