Comparison of Modes of Evolution of Cultivated Forms from Two Wild Rice Species, Oryza breviligulata and O. perennis

The cultivated rice of West Africa, Oryza glaberrima, and its wild relative, O. breviligulata, endemic to the same region, differ from O. sativa and O. perennis in certain morphological as well as physiological traits, and are isolated from the latter two species by the F1sterility barrier. In many...

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Bibliographic Details
Published in:Evolution 1963-06, Vol.17 (2), p.170-181
Main Authors: Morishima, Hiroko, Hinata, Kokichi, Oka, Hiko-Ichi
Format: Article
Language:English
Subjects:
Evolution
Genetic variation
Hybridity
Panicles
Plants
Population genetics
Rice
Seeds
Spikelets
Wild rice
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Summary:The cultivated rice of West Africa, Oryza glaberrima, and its wild relative, O. breviligulata, endemic to the same region, differ from O. sativa and O. perennis in certain morphological as well as physiological traits, and are isolated from the latter two species by the F1sterility barrier. In many crosses between and within these species, however, some Asian strains of O. perennis showed partial fertility with O. breviligulata and O. glaberrima. Further, a number of breviligulata populations collected from West African countries was investigated regarding variations in various characters. Multivariate analysis of the data shows that populations from a certain area of Mali Republic (French Sudan) were approaching cultivated forms, though no cultivation of O. glaberrima was found nearby. Such intermediates between wild and cultivated forms might be comparable to those of O. perennis and O. sativa found in a mountainous area of India, the Jeypore Tract. It was then assumed that O. glaberrima might have arisen from O. breviligulata independently of the origin of O. sativa from its putative wild progenitor, the Asian perennis type of O. perennis, and the mode of evolution of cultivated forms in the two parallel series was compared. In addition to certain similarities, significant differences were pointed out which could be attributed to the difference in propagating habit. For instance, possibly on account of the annual habit, O. breviligulata carries a larger variability among its populations, but a smaller heterozygosity, than the Asian perennis type. It was noted, in addition, that O. stapfii Roschev. is synonymous with O. breviligulata A. Cheval. et Roehr.
ISSN:0014-3820
1558-5646
DOI:10.2307/2406462