Cytological observations in some hybrids between the rice species Oryza sativa L. and O. glaberrima
Steud. |
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| Authors: | J Bouharmont M Olivier M Dumont de Chassart |
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| Institution: | (1) Department of Biology, Université Catholique de Louvain, 1348 Louvain-la-Neuve, Belgium |
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| Abstract: | Summary Several hybrids between Oryza sativa and O. glaberrima and their backcrosses with O. sativa were studied. Their seed sterility was very different; large differences were also observed in the level of pollen sterility and in the earliness of microspore failure. The proportion of aborted embryo sacs was much lower than the rate of sterile male gametophytes. The backcross populations were much more sterile than the corresponding F1 hybrids. On the base of our observations and according to the literature, we may conclude that genic unbalance is the main cause of sterility of these hybrids, but that physiological factors may also be involved. Thus a restoration of fertility is generally possible by selection. On the other hand, male-sterile lines could be bred from some of these hybrids. |
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| Keywords: | Oryza sativa rice Oryza glaberrima African rice interspecific hybrids hybrid sterility male sterility |
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