The origins of reproductive isolation in plants

Baack, Eric, Melo, Maria Clara, Rieseberg, Loreb H. and Ortiz-Barrientos, Daniel (2015) The origins of reproductive isolation in plants. New Phytologist, 207 4: 968-984. doi:10.1111/nph.13424


Author Baack, Eric
Melo, Maria Clara
Rieseberg, Loreb H.
Ortiz-Barrientos, Daniel
Title The origins of reproductive isolation in plants
Journal name New Phytologist   Check publisher's open access policy
ISSN 0028-646X
1469-8137
Publication date 2015-09-01
Year available 2015
Sub-type Critical review of research, literature review, critical commentary
DOI 10.1111/nph.13424
Open Access Status DOI
Volume 207
Issue 4
Start page 968
End page 984
Total pages 17
Place of publication Oxford, United Kingdom
Publisher Blackwell Publishing
Language eng
Abstract Reproductive isolation in plants occurs through multiple barriers that restrict gene flow between populations, but their origins remain uncertain. Work in the past decade has shown that postpollination barriers, such as the failure to form hybrid seeds or sterility of hybrid offspring, are often less strong than prepollination barriers. Evidence implicates multiple evolutionary forces in the origins of reproductive barriers, including mutation, stochastic processes and natural selection. Although adaptation to different environments is a common element of reproductive isolation, genomic conflicts also play a role, including female meiotic drive. The genetic basis of some reproductive barriers, particularly flower colour influencing pollinator behaviour, is well understood in some species, but the genetic changes underlying many other barriers, especially pollen-stylar interactions, are largely unknown. Postpollination barriers appear to accumulate at a faster rate in annuals compared with perennials, due in part to chromosomal rearrangements. Chromosomal changes can be important isolating barriers in themselves but may also reduce the recombination of genes contributing to isolation. Important questions for the next decade include identifying the evolutionary forces responsible for chromosomal rearrangements, determining how often prezygotic barriers arise due to selection against hybrids, and establishing the relative importance of genomic conflicts in speciation.
Formatted abstract
Reproductive isolation in plants occurs through multiple barriers that restrict gene flow between populations, but their origins remain uncertain. Work in the past decade has shown that postpollination barriers, such as the failure to form hybrid seeds or sterility of hybrid offspring, are often less strong than prepollination barriers. Evidence implicates multiple evolutionary forces in the origins of reproductive barriers, including mutation, stochastic processes and natural selection. Although adaptation to different environments is a common element of reproductive isolation, genomic conflicts also play a role, including female meiotic drive. The genetic basis of some reproductive barriers, particularly flower colour influencing pollinator behaviour, is well understood in some species, but the genetic changes underlying many other barriers, especially pollen–stylar interactions, are largely unknown. Postpollination barriers appear to accumulate at a faster rate in annuals compared with perennials, due in part to chromosomal rearrangements. Chromosomal changes can be important isolating barriers in themselves but may also reduce the recombination of genes contributing to isolation. Important questions for the next decade include identifying the evolutionary forces responsible for chromosomal rearrangements, determining how often prezygotic barriers arise due to selection against hybrids, and establishing the relative importance of genomic conflicts in speciation.
Keyword Genetic architecture
Geography of speciation
Local adaptation
Plants
Reproductive isolation
Speciation
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Critical review of research, literature review, critical commentary
Collections: Official 2016 Collection
School of Biological Sciences Publications
 
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