Edaphic microsatellite DNA divergence in wild emmer wheat, Triticum dicoccoides, at a microsite: Tabigha, Israel |
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Authors: | Y C Li T Fahima J H Peng MS Röder V M Kirzhner A Beiles A B Korol E Nevo |
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Institution: | (1) Institute of Evolution, University of Haifa, Haifa 31905 e-mail: nevo@research.haifa.ac.il, Fax: +972-48246554, XX;(2) Institute for Plant Genetics and Crop Plant Research, Corrensstrasse 3, 06466 Gatersleben, Germany, DE |
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Abstract: | Twenty eight microsatellite markers were used to analyze genetic divergence in tandem dinucleotide repeated DNA regions between
two edaphic subpopulations of Triticum dicoccoides growing on the contrasting terra rossa and basalt soilsfrom a microsite at Tabigha, north of the Sea of Galilee, Israel. The
terra rossa soil niche was drier and more stressful than the basalt throughout the growing season (November to May). Significant
microsatellite divergence in allele distribution, repeat length, genetic diversity, and linkage disequilibria were found between
emmer wheat from the two soil types over two short transects of 100 m each. Soil-specific and -unique alleles and linkage disequilibria were observed in the terra rossa and basalt subpopulations. A permutation test showed that
the effects of random genetic drift were very low for the significant genetic diversity at microsatellite loci between the
two subpopulations, suggesting that an adaptive molecular pattern derived by edaphic selection may act upon variation of the
microsatellites.
Received: 4 February 2000 / Accepted: 31 March 2000<@head-com-p1a.lf>Communicated by H.F. Linskens |
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Keywords: | Genetic diversity Edaphic selection Microsatellite Microsite divergence Wild emmer wheat Triticum dicoccoides |
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