Endosperm-based incompatibilities in hybrid monkeyflowers

Taliesin Kinser, Ronald Smith, Amelia Lawrence, Arielle Cooley, Mario Vallejo-Marín, Gregory Conradi Smith & Joshua Puzey
The sexual endosperm is an angiosperm innovation central to flowering plant reproduction. Genomic interactions between parental alleles control its development and help determine seed viability. These interactions are characterized by genomic imprinting, where expression from certain genes is parent-specific. Unsuccessful imprinting has been linked to failed hybridization between plants of different species or ploidies. Here, we describe an endosperm-based barrier between Mimulus guttatus, a diploid, and M. luteus, an allotetraploid. Hybrid seeds suffer from underdeveloped...
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