Fig. 5: Model for the evolutionary history and genetic action of Se. | Nature Communications

Fig. 5: Model for the evolutionary history and genetic action of Se.

From: Two complementary genes in a presence-absence variation contribute to indica-japonica reproductive isolation in rice

Fig. 5: Model for the evolutionary history and genetic action of Se.The alternative text for this image may have been generated using AI.

a Proposal for the evolutionary history of Se locus. Ancestral wild rice lack the PAV region, and Se locus emerged after the divergence of the AA-genome clade of Oryza. Following the differentiation of O. meridionalis, O. barthii, and O. rufipogon, the Se locus later evolved in parallel but independent lineages. Based on the haplotype combinations of ORF3 and ORF4, five main types of Se loci have been identified. O. rufipogon, O. nivara, indica and japonica samples include four, four, four, and three different types, respectively, and their frequencies are shown next to each type. Full-length ORF3 (red), truncated ORF3 (gray), ORF4 (green), and deletions in ORF4 promoter (triangles) are shown. b A proposed model for the molecular genetic basis of Se-mediated HMS. In hybrids with hemizygous functional ORF3 and ORF4 (left), pollen lacking the PAV region are aborted because of the pollen-killing effect of ORF3 and lack of protective ORF4. When truncated and non-functional ORF3 is present (right), only fertile pollen are produced.

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