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GrainGenes Reference Report: TAG-102-853

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Reference	TAG-102-853
Title	Spatiotemporal allozyme divergence caused by aridity stress in a natural population of wild wheat, Triticum dicoccoides, at the Ammiad microsite, Israel
Journal	Theoretical and Applied Genetics
Year	2001
Volume	102
Pages	853-864
Author	Li YC [ Show all 6 ]
Abstract	Summary: Spatiotemporal diversity at 35 allozyme loci was assayed over 6 years in 1,207 individuals of wild emmer wheat (Triticum dicoccoides) from a microgeographic microsite, Ammiad, north Israel. This analysis used new methods and two additional sample sets (1988 and 1993) and previous allozymic data (1984-1987). This microsite includes four major habitats (North-facing slope, Valley, Ridge, and Karst) that show topographic and ecological heterogeneity. Significant temporal and spatial variations in allele frequencies and levels of genetic diversity were detected in the four subpopulations. Significant associations were observed among allele frequencies and gene diversities at different loci, indicating that many allele frequencies change over time in the same or opposite directions. Multiple regression analysis showed that variation in soil-water content and rainfall distribution in the growing season significantly affected 10 allele frequencies, numbers of alleles at 8 loci, and gene diversity at 4 loci. Random genetic drift and hitch-hiking models may not explain such locus-specific spatiotemporal divergence and strong allelic correlation or locus correlation as well as the functional importance of allozymes. Natural ecological selection, presumably through water stress, might be an important force adaptively directing spatiotemporal allozyme diversity and divergence in wild emmer wheat at the Ammiad microsite
External Databases	http://link.springer-ny.com/link/service/journals/00122/bibs/1102006/11020853.htm
Keyword	[ Hide all but 1 of 55 ] allele frequencies alleles allozyme allozyme diversity associations correlation cyclical selection dicoccoides differentiation divergence diversity drift emmer emmer wheat environmental associations force frequencies gene genetic genetic diversity genetic drift habitats heterogeneity israel loci locus method microgeographic genetic diversity microsite model molecular evolution multiple natural population neutral theory plant science polymorphism population rainfall regression regression analysis selection soil water soil water content spatial variation stress temporal diversity temporal variation triticum triticum dicoccoides water water stress wild wild emmer wild emmer wheat wild wheat

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