Enzyme Polymorphism in Plant Populations
| dc.contributor.author | Brown, A.H.D. | |
| dc.date.accessioned | 2014-06-20T07:01:54Z | |
| dc.date.available | 2014-06-20T07:01:54Z | |
| dc.date.issued | 1979 | |
| dc.description.abstract | This review encompasses a decade of studies of euzyme polymorphism in plant populations, in the light of both general theory and specific, simplified models. T'he patterns of the observed frequency of heterozygotes, compared withi panmictic expectations adjusted only for inbreeding, are summarised tor 23 outbreeding and 7 inbreeding plant species. There is a trend for outbreeders to show less heterozygosity than expected, mid inbreeders to show more, despite tlie contrary evolutionary pressures on the rnatmg system (the so-called hetero-zygosity paradox). An annual life cycle and pollination by animal vectors seem to increase the discrepancy in outbreeders. Of the several forces which might account for this paradox, the effects of intense microgeogrnphic differentiation, of low gene flow, of self compatibility and of overdominance of linked segments are predominant. The evidence indicates that inbreeding plant species show more intense geographic and microgeographic differentiation, and more intense multilocus associations than outbreetlers. Recent attempts to describe selection operating on variants by the analysis of life cycle components, of physiological processes, and of genetic demography are discussed. The fundamental importance of mating systems and their variation, as a distinctive feature of plant populations is already clear from tile studies in hand. Therefore a closer integration of the joint microevolution of mating systems, and of genetic variation is required in both theoretical and experimental studies | en_US |
| dc.identifier.citation | Theoretical Population Biology 15, 1-42 (1979) | en_US |
| dc.identifier.uri | http://hdl.handle.net/123456789/3154 | |
| dc.language.iso | en | en_US |
| dc.title | Enzyme Polymorphism in Plant Populations | en_US |
| dc.type | Article | en_US |