Population biology of Avena XI. Variation in peripheral isolates of A. barbata |
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| Authors: | S K Jain K N Rai R S Singh |
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| Institution: | (1) Department of Agronomy and Range Science, University of California, 95616 Davis, CA, USA;(2) Present address: Millet Breeding, ICRISAT, Hyderabad, A.P., India;(3) Present address: Department of Biology, McMaster University, Hamilton, Ontario, Canada |
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| Abstract: | Data on genetic polymorphism, scored at two morphological loci, showed peripheral, isolated roadside colonies of slender oat (Avena barbata) to be significantly less polymorphic than the large central populations in continuous stands. The role of random drift (founder effect) was evident in the genetic structure of such roadside colonies which were, however, not monomorphic. Multilocus associations also suggested large Hill-Robertson effect in generating gametic disequilibria. Such isolates with varying amounts of elapsed time since the founder events could offer useful material for a study of evolutionary processes including the selection-drift balance. |
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