Triploid block is a phenomenon describing the formation of nonviable progeny after hybridization of flowering plants that differ in ploidy. The barrier is established in the endosperm, a nutritive tissue supporting embryo growth. This phenomenon usually happens when autopolyploidy 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.
- Köhler, C; Mittelsten Scheid, O; Erilova, A (Mar 2010). "The impact of the triploid block on the origin and evolution of polyploid plants". Trends in Genetics. 26 (3): 142–8. doi:10.1016/j.tig.2009.12.006. PMID 20089326.
- Marks, G. E. "The Origin and Significance of Intraspecific Polyploidy: Experimental Evidence from Solanum chacoense". Evolution. 20 (4): 552. doi:10.2307/2406589.
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