The direction of pollen flow between two co-occurring rice species, Oryza sativa and O. glaberrima1
The direction of pollen flow between two co-occurring rice species, Oryza sativa and O. glaberrima1
复制标题
两种共生水稻品种 Oryza sativa 和 O. glaberrima1 之间的花粉流动方向
作者：
Y. Sano
两个栽培稻品种Oryza sativa L.和O. glaberrima Steud.，通常在西非的农田里混合种植。两个同域种，从两个不同的领域收集。两个物种间的种间杂交的频率估计从收获的种子在农民的领域和人工混合物。这两个物种是通过合子前隔离障碍如自花受精和开花时间的差异而隔离的，但这种隔离是不完全的。杂交频率为0.8%~ 4.5%。glaberrima生产的。这说明花粉流是从O. sativa为O.当它们杂交时会产生光裂。一般来说，O。glaberrima的柱头外露率高于O. sativa.花粉流动的方向似乎可以用O. glaberrima。遗传后果也讨论了两个远亲物种之间的基因流。
Two cultivated rice species, Oryza sativa L. and O. glaberrima Steud., are often grown mixed in farmers' fields in West Africa. Two sympatric species were collected from two different fields. The frequency of interspecific hybridization between the two species was estimated from the seeds harvested in farmers' fields and in artificial mixtures. The two species were isolated by prezygotic isolating barriers such as autogamy and differences in time of flowering, however, the isolation was incomplete. The frequency of hybridization varied from 0· 8 to 4· 5 per cent. In addition, all 87 hybrids were found from the seeds which O. glaberrima produced. This shows that pollen flow occurs from O. sativa to O. glaberrima when they hybridize. Generally, O. glaberrima had a higher per cent of exserted stigmas as compared with O. sativa. The direction of pollen flow appeared to be explained by a higher efficiency of pollen capture in O. glaberrima. The genetic consequences were also discussed in relation to gene flow between two distantly related species.