Divergence in flowering time contributes reproductive isolation between wild rice species

This study chose a pair of wild rice species (Oryza rufipogon and O. nivara) as a unique system to investigate the between-species reproductive isolation based on artificial crossing experiment and the flowering census from the common garden experiment. Researchers demonstrate that divergent flowering time between species contributes to nearly complete reproductive isolation and thus the major factor leading to the origin of the new species O. nivara.