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GrainGenes Reference Report: GCE-47-323

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Reference	GCE-47-323
Title	Genetic diversity in populations of wild diploid wheat Triticum urartu Tum. ex. Gandil. revealed by isozyme markers
Journal	Genetic Resources and Crop Evolution
Year	2000
Volume	47
Pages	323-334
Author	Moghaddam M Ehdaie B Waines JG
Abstract	Summary: Genetic variation and its distribution within and among 23 populations of Triticum urartu collected from Syria, Lebanon, Turkey, Armenia, and Iran was estimated using isozyme markers at eight polymorphic loci. The number of alleles per locus (A = 1.21), percentage polymorphic loci (P = 20.1%), and mean gene diversity (H(e) = 0.024) were relatively low. In a population from Lebanon, a high number of alleles per locus (A = 2.13) and percentage polymorphic loci (P = 87.5%) was found. On average, genetic variation among populations (G(ST) = 0.407) was smaller than within-population variation (0.593). However, different patterns of genetic structure were found among various geographic regions. Interpopulation variation was highest for the Iranian populations (0.89) followed by the Turkish populations (0.66). A reverse pattern was observed for the Syrian (0.11) and for the Lebanese (0.13) populations. The Armenian populations exhibited similar interpopulation and within-population variation. Principal component and cluster analyses resulted in distinct grouping of the geographically proximal populations, with the exception of the two Iranian populations. The Turkish populations were different from the neighboring Armenian populations compared to other countries. The populations from southern Syria and those form Lebanon also exhibited a high degree of genetic diversity. The two most heterozygous loci, Mdh-2 and Pgi-2, separated the populations along the first and second principal components, respectively. Most of the rare alleles were scattered sporadically throughout the geographic regions. Rare alleles with high frequencies were found in the Turkish and Armenian populations. These indicated that different geographic regions require specific sampling procedures in order to capture the range of genetic variation observed in T. urartu populations
Keyword	[ Hide all but 1 of 30 ] a genome alleles biodiversity bread wheat diversity gene genetic diversity genetic structure genetic variation genome donor germplasm collection iran isozyme isozyme markers its loci locus marker patterns polymorphism population rapd markers rare rflp tetraploid wheats triticum triticum urartu tum.ex.gandil. turkey variability wild

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