Models for pearl millet domestication as an example of cereal domestication. I. A one locus asymmetrical model
1988; Elsevier BV; Volume: 131; Issue: 3 Linguagem: Inglês
10.1016/s0022-5193(88)80227-3
ISSN1095-8541
AutoresCatherine Larédo, Jean-Marc Pernès,
Tópico(s)Plant Reproductive Biology
ResumoThe aim of this paper is to study the first steps of cereal domestication through a simple model. It is assumed that the wild population predominates over the cultivated one, and that wild and cultivated plants differ only by one locus with two alleles (the wild allele being dominant). The parameters introduced in the model are the selfing rate, α, of the cultivated species, the strength of selection, v , against hybrids prior to flowering and the migration rate of wild pollen, m . We first study a deterministic modelization, then we investigate the importance of the approximations carried out in this modelization. This leads to the study of two Markov chains: a Fisher-Wright model and a Markov chain associated with the random fluctuations of the wild pollination rate. We found that the domestication process could be initiated quickly, was easier with self-pollinating plants, and that parameter v had no qualitative effects on the domestication. The wild pollination rate is the major factor in this process, and the effects of its random fluctuations are important.
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