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The Dynamics of Plant Domestication: Cultivation Experiments with Oryza perennis and Its Hybrid with O. sativa

Hiko-Ichi Oka and Hiroko Morishima
Evolution
Vol. 25, No. 2 (Jun., 1971), pp. 356-364
DOI: 10.2307/2406927
Stable URL: http://www.jstor.org/stable/2406927
Page Count: 9
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The Dynamics of Plant Domestication: Cultivation Experiments with Oryza perennis and Its Hybrid with O. sativa
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Abstract

To observe how the Asian form of Oryza perennis, the wild progenitor of O. sativa, responds to the impact of cultivation, experimental populations raised from seeds collected in natural habitats and hybrid populations with sativa were grown for several generations at Taichung, Taiwan. Populations containing sativa genes gradually became domesticated in characters distinguishing wild from cultivated types. The genotypic change was more rapid in bulk populations than in pedigrees. Plants showing cultivated characters were more homozygous than those with wild characters, suggesting that natural selection for cultivated characters resulted in an increase of selfing rate. Comparing naturally sown populations with those seeded by hand, seeding was found to be an effective agent causing "cultivation pressure."

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