THB1, a putative transmembrane protein that causes hybrid breakdown in rice.

Hybrid breakdown is a post-zygotic reproductive isolation that hinders genetic exchange between species or populations in both animals and plants. Two complementary recessive genes, () and , cause hybrid breakdown in rice (). The present study delimited the locus to a 9.

The induces low temperature-dependent intrasubspecific hybrid breakdown in rice.

Hybrid breakdown (HB) is an important type of post-zygotic reproductive barrier that inhibits hybrid production during the process of cross-breeding. A novel low temperature-dependent HB was identified in a chromosomal segment substitution line (CSSL) library derived from a cross of two rice ( L. ) cultivars, Yukihikari and Kirara397.