Triploid block
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Triploid block is a phenomenon describing the formation of nonviable progeny after hybridization of
flowering plant Flowering plants are plants that bear flowers and fruits, and form the clade Angiospermae (), commonly called angiosperms. The term "angiosperm" is derived from the Greek words ('container, vessel') and ('seed'), and refers to those plants th ...
s that differ in ploidy. The barrier is established in the endosperm, a nutritive tissue supporting embryo growth. This phenomenon usually happens when
autopolyploidy Polyploidy is a condition in which the cells of an organism have more than one pair of ( homologous) chromosomes. Most species whose cells have nuclei ( eukaryotes) are diploid, meaning they have two sets of chromosomes, where each set contain ...
occurs in diploid plants. Triploid blocks lead to reproductive isolation. The triploid block effects have been explained as possibly due to genomic imprinting in the endosperm.


References

Botany Evolution {{botany-stub