Parent-of-origin effects generate phenotypes that depend on the direction of a cross. This
phenomenon occurs frequently during angiosperm seed development, where maternal …

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

Wide crosses result in postzygotic elimination of one parental chromosome set, but the
mechanisms that result in such differential fate are poorly understood. Here, we show that …

Summarizing landmark research, Volume 2 of this essential series furnishes information on
the availability of germplasm resources that breeders can exploit for producing high-yielding …

In plants, whole-genome doubling (polyploidization) is a widely occurring process largely
contributing to plant evolution and diversification. The generation and fusion of diploid …

Polyploidization has played a major role in the origin and evolution of polyploid species. In
this article we outline the unique characteristics of 2 n gametes and implications of their …

The molecular mechanisms underlying lethality of F1 hybrids between diverged parents are
one target of speciation research. Crosses between diploid and tetraploid individuals of the …

Hawthorns and medlars are closely related genera in Rosaceae subfamily Maloideae,
whose taxonomy remains poorly understood. Gametophytic apomixis occurs in polyploids …

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

In most angiosperms, the endosperm is limited to a short phase of the plant life-cycle where
it forms part of the seed and plays a major role in its development. Our understanding of this …