Rice interspecies hybrids show precocious or delayed developmental transitions in the endosperm without change to the rate of syncytial nuclear division.

摘要: In angiosperms, interspecific crosses often display hybrid incompatibilities that are manifested as under-proliferation or over-proliferation of endosperm. Recent analyses using between Arabidopsis thaliana and its related species with different ploidy levels have shown hybridization causes delayed developmental transition increased mitotic activity in the this study, we investigated endosperm development diploid Oryza species. a cross female O. sativa male punctata, found was reduced size associated precocious transition. By contrast, longistaminata generated enlarged at mid-point seed Subsequently, displayed shriveled appearance maturation stage. We accumulation storage products expression patterns several marker genes were also altered rate syncytial nuclear divisions not significantly affected. The gene OsMADS87 showed maternal origin-specific pattern rice endosperm, contrast to homologue PHERES1, which shows paternal expression. decreased depending on type change Our results indicate one interspecies barriers is mediated by alterations de-regulation OsMADS87, without division