Intrinsic postzygotic isolation typically appears as reduced viability or fertility of interspecific
hybrids caused by genetic incompatibilities between diverged parental genomes …

Although intrinsic postzygotic reproductive barriers can play a fundamental role in
speciation, their underlying evolutionary causes are widely debated. One hypothesis is that …

Hybrid seed failure arising from wide crosses between plant species is a recurring obstacle
in plant breeding, impeding the transfer of desirable traits. This postzygotic reproductive …

The endosperm, a transient seed tissue, plays a pivotal role in supporting embryo growth
and germination. This unique feature sets flowering plants apart from gymnosperms …

The triploid block, which prevents interploidy hybridizations in flowering plants, is
characterized by a failure in endosperm development, arrest in embryogenesis, and seed …

Gene expression in endosperm—a seed tissue that mediates transfer of maternal resources
to offspring—is under complex epigenetic control. We show here that plant-specific RNA …

Endosperm is a major evolutionary innovation of flowering plants, and its proper
development critically impacts seed growth and viability. Epigenetic regulators have a key …

Understanding which reproductive barriers contribute to speciation is essential to
understanding the diversity of life on earth. Several contemporary examples of strong hybrid …

Gene expression has a key role in reproductive isolation, and studies of hybrid gene
expression have identified mechanisms causing hybrid sterility. Here, we review the …

Endosperm in angiosperms and placenta in eutherians are convergent innovations for
efficient embryonic nutrient transfer. Despite advantages, this reproductive strategy incurs …