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Genomics of Speciation in Temperate and Boreal Angiosperm Trees

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Comparative and Evolutionary Genomics of Angiosperm Trees

Part of the book series: Plant Genetics and Genomics: Crops and Models ((PGG,volume 21))

Abstract

Understanding how species form and persist has been a central objective of evolutionary biology since the time of Darwin. Species emerge where two or more populations develop reproductive barriers yielding phenotypic and genetic divergence. This definition has led some to question the reality of species boundaries in plants. In contrast to animals, in which behavioral traits may allow sympatric groups to establish and maintain reproductive isolation (RI), plants do not benefit from mate selection in quite the same way. As a result, the definition of plant species has long confounded evolutionary biologists, as have the ecological and genetic processes that underlie their formation. Temperate and boreal angiosperm trees make an interesting case study in this regard, where a lack of RI often leads to difficulties in defining closely related species. With widespread and overlapping distributions, many tree species must resist gene flow from congeners, often in the absence of pre- and post-zygotic barriers, in order to maintain adaptations to their particular niche. While high rates of intraspecific gene flow likely promote species cohesion, angiosperm trees also show extensive interspecific hybridization in contact zones. In this chapter we highlight recent work to understand the pattern and process of speciation in angiosperm trees, and how contemporary sequencing technologies are providing insights into the genomic mechanisms that underlie genomic porosity on the one hand, and isolation on the other.

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Authors and Affiliations

  1. Department of Forest Resources and Environmental Conservation, Virginia Polytechnic Institute and State University, 304 Cheatham Hall, Blacksburg, VA, USA, 24061

    R. Bawa & J. A. Holliday

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  1. R. Bawa
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  2. J. A. Holliday
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Correspondence to J. A. Holliday .

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  1. Pacific Southwest Research Station, United States Forest Service, Davis, California, USA

    Andrew Groover

  2. Department of Botany, University of British Columbia, Vancouver, British Columbia, Canada

    Quentin Cronk

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Bawa, R., Holliday, J.A. (2016). Genomics of Speciation in Temperate and Boreal Angiosperm Trees. In: Groover, A., Cronk, Q. (eds) Comparative and Evolutionary Genomics of Angiosperm Trees. Plant Genetics and Genomics: Crops and Models, vol 21. Springer, Cham. https://doi.org/10.1007/7397_2016_18

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