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Postzygotic reproductive isolation maintains species integrity and uniformity and contributes to speciation by restricting the free gene flow between divergent species. In this study we identify causal genes of two Mendelian factors  S22A  and  S22B  on rice chromosome 2 inducing F 1  pollen sterility in hybrids between  Oryza sativa  japonica-type cultivar Taichung 65 (T65) and a wild relative of rice species  Oryza glumaepatula . The causal gene of  S22B  in T65 encodes a protein containing DUF1668 and gametophytically expressed in the anthers, designated  S22B_j . The  O. glumaepatula  allele  S22B-g , allelic to  S22B_j , possesses three non-synonymous substitutions and a 2-bp deletion, leading to a frameshifted translation at the S22B C-terminal region. Transcription level of  S22B-j  and/or  S22B_g  did not solely determine the fertility of pollen grains by genotypes at  S22B . Western blotting of S22B found that one major band with approximately 46 kDa appeared only at the mature stage and was reduced on semi-sterile heterozygotes at  S22B , implying that the 46 kDa band may associated in hybrid sterility. In addition, causal genes of  S22A  in T65 were found to be  S22A_j1  and  S22A_j3  encoding DUF1668-containing protein. The allele of a wild rice species  Oryza meridionalis  Ng at  S22B , designated  S22B_m , is a loss-of-function allele probably due to large deletion of the gene lacking DUF1668 domain and evolved from the different lineage of  O. glumaepatula . Phylogenetic analysis of DUF1668 suggested that many gene duplications occurred before the divergence of current crops in Poaceae, and loss-of-function mutations of DUF1668-containing genes represent the candidate causal genetic events contributing to hybrid incompatibilities. The duplicated DUF1668-domain gene may provide genetic potential to induce hybrid incompatibility by consequent mutations after divergence.

Domain Unknown Function DUF1668-Containing Genes in Multiple Lineages Are Responsible for F1 Pollen Sterility in Rice