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Genetic Diversity and Environmental Associations of Wild Barley, Hordeum spontaneum, in Israel
Eviatar Nevo, Daniel Zohary, A. H. D. Brown and Michael Haber
Vol. 33, No. 3 (Sep., 1979), pp. 815-833
Published by: Society for the Study of Evolution
Stable URL: http://www.jstor.org/stable/2407648
Page Count: 19
You can always find the topics here!Topics: Barley, Genetic loci, Population genetics, Alleles, Genetics, Spikelets, Genetic variation, Rain, Grains, Species
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Genetic structure of populations of the wild progenitor of barley was studied by electrophoretically discernible allozymic variation in proteins encoded by 28 gene loci in 1,179 individuals representing 28 populations of wild barley, Hordeum spontaneum, in Israel; for comparison the same test was conducted on 100 random seeds of Composite Cross XXI (generation 17) of cultivated barley, Hordeum vulgare. Likewise, four spikelet traits were measured in 26 of the aforementioned populations of wild barley. The results indicate that: (a) Hordeum spontaneum in Israel is extremely rich genetically but because of predominant self-pollination the variation is carried primarily by different homozygotes in the population; (b) genetic differentiation of populations includes clinal, regional and local patterns, sometimes displaying sharp geographic differentiation over short distances; (c) the patterns of genetic and spikelet variation in the wild gene pool are significantly correlated with the environment and are predictable ecologically, chiefly by combinations of temperature and humidity variables but also by soil types and vegetation; (d) natural populations are on average more variable than the tested Composite Cross generation; (e) distinct geographic variation is shown also by all four morphological traits examined (statistically significant amount of variation is present between localities within regions and between regions); and (f) allozymic variation is largely not correlated with spikelet variation. The spatial patterns and environmental correlates and predictors of genetic variation of H. spontaneum in Israel indicate that genetic variation in wild barley populations is not only common but also at least partly adaptive. Therefore a much fuller exploitation of these genetic resources by breeding is warranted.
Evolution © 1979 Society for the Study of Evolution