Genetic systems of cross-incompatibility as pre- and postfertilization barriers in rice
2003
Matsubara, K. | Suzuki, R. | Khin-Tidar | Okuno, K. | Sano, Y.
Both pre- and postfertilization barriers have been detected after introducing alien genes from wild rice into cultivated rice, which showed unidirectional cross-incompatibility. Aborted seeds were frequently produced when the near-isogenic line (NIL, japonica type) carrying the segment of chromosome 6 from Oryza rufipogon was pollinated with the current parent, whereas the reciprocal showed normal seed setting. The cross-incompatibility was explained by three genes (Cinf, Su-Cinf, and cinm), all of which were located on the short arm. Cinf and cinm controlled the cross-incompatibility in the female and male, respectively, and Su-Cinf acted as a suppressor of Cinf. All three genes were expressed sporophytically. Meanwhile, retardation of pollen tube elongation was observed when Akihikari (japonica type) was pollinated with IR58. The genetic analysis suggested that both female and male reactions in Akihikari were controlled by dominant genes, confirming that the genes for cross-incompatibility are present in closely related relatives of rice.
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