TY - JOUR
T1 - When Two Rights Make a Wrong
T2 - The Evolutionary Genetics of Plant Hybrid Incompatibilities
AU - Fishman, Lila
AU - Sweigart, Andrea L.
N1 - Publisher Copyright:
© 2018 by Annual Reviews. All rights reserved.
PY - 2018/4/29
Y1 - 2018/4/29
N2 - 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 F1 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.
AB - 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 F1 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.
KW - Chromosomal rearrangement
KW - Cytoplasmic male sterility
KW - Dobzhansky-Muller incompatibility
KW - Hybrid inviability
KW - Hybrid sterility
KW - Speciation
UR - http://www.scopus.com/inward/record.url?scp=85046798976&partnerID=8YFLogxK
U2 - 10.1146/annurev-arplant-042817-040113
DO - 10.1146/annurev-arplant-042817-040113
M3 - Review article
C2 - 29505737
AN - SCOPUS:85046798976
SN - 1543-5008
VL - 69
SP - 707
EP - 731
JO - Annual Review of Plant Biology
JF - Annual Review of Plant Biology
ER -