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Significance Hybrid sterility, a major reproductive barrier between species, hinders the transfer of desirable traits from one species to another. We report a forward genetic approach for creating a “neutral” allele of theS 1 locus, a major interspecific hybrid sterility locus in rice. This neutral allele does not induce hybrid sterility in combination with alleles from either Asian or African rice species. The allele carries a deletion in the peptidase-coding gene,SSP , in theS 1 locus. This work provides mechanistic and evolutionary insights into hybrid sterility and demonstrates the feasibility of the approach that allows broader access to desirable traits in distantly related species during crop breeding.

Lineage-specific gene acquisition or loss is involved in interspecific hybrid sterility in rice