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Mating system variation in hybrid zones: facilitation, barriers and asymmetries to gene flow
Author(s) -
Pickup Melinda,
Brandvain Yaniv,
Fraïsse Christelle,
Yakimowski Sarah,
Barton Nicholas H.,
Dixit Tanmay,
Lexer Christian,
Cereghetti Eva,
Field David L.
Publication year - 2019
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/nph.16180
Subject(s) - introgression , gene flow , reproductive isolation , biology , mating system , mating , outcrossing , evolutionary biology , facilitation , hybrid zone , genetics , ecology , gene , genetic variation , population , pollen , demography , neuroscience , sociology
Summary Plant mating systems play a key role in structuring genetic variation both within and between species. In hybrid zones, the outcomes and dynamics of hybridization are usually interpreted as the balance between gene flow and selection against hybrids. Yet, mating systems can introduce selective forces that alter these expectations; with diverse outcomes for the level and direction of gene flow depending on variation in outcrossing and whether the mating systems of the species pair are the same or divergent. We present a survey of hybridization in 133 species pairs from 41 plant families and examine how patterns of hybridization vary with mating system. We examine if hybrid zone mode, level of gene flow, asymmetries in gene flow and the frequency of reproductive isolating barriers vary in relation to mating system/s of the species pair. We combine these results with a simulation model and examples from the literature to address two general themes: (1) the two‐way interaction between introgression and the evolution of reproductive systems, and (2) how mating system can facilitate or restrict interspecific gene flow. We conclude that examining mating system with hybridization provides unique opportunities to understand divergence and the processes underlying reproductive isolation.