Journal
ANNUAL REVIEW OF PLANT BIOLOGY, VOL 69
Volume 69, Issue -, Pages 707-731Publisher
ANNUAL REVIEWS
DOI: 10.1146/annurev-arplant-042817-040113
Keywords
cytoplasmic male sterility; chromosomal rearrangement; Dobzhansky-Muller incompatibility; hybrid sterility; hybrid inviability; speciation
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Hybrids between flowering plant species often exhibit reduced fitness, including sterility and inviability. Such hybrid incompatibilities create barriers to genetic exchange that can promote reproductive isolation between diverging populations and, ultimately, speciation. Additionally, hybrid breakdown opens a window into hidden molecular and evolutionary processes occurring within species. Here, we review recent work on the mechanisms and origins of hybrid incompatibility in flowering plants, including both diverse genic interactions and chromosomal incompatibilities. Conflict and coevolution among and within plant genomes contributes to the evolution of some well-characterized genic incompatibilities, but duplication and drift also play important roles. Inversions, while contributing to speciation by suppressing recombination, rarely cause underdominant sterility. Translocations cause severe F-1 sterility by disrupting meiosis in heterozygotes, making their fixation in outcrossing sister species a paradox. Evolutionary genomic analyses of both genic and chromosomal incompatibilities, in the context of population genetic theory, can explicitly test alternative scenarios for their origins.
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