Early evolution of reproductive isolation: a case of weak inbreeder/strong outbreeder leads to an intraspecific hybridization barrier in Arabidopsis lyrata

Evolution ◽  
2021 ◽  
Author(s):  
Ömer İltaş ◽  
Marek Svitok ◽  
Amandine Cornille ◽  
Roswitha Schmickl ◽  
Clément Lafon Placette
Keyword(s):  
Reproductive Isolation ◽  
Early Evolution ◽  
Intraspecific Hybridization ◽  
Arabidopsis Lyrata

scholarly journals Role of seed germination in adaptation and reproductive isolation in Arabidopsis lyrata

2017 ◽  
Vol 26 (13) ◽  
pp. 3484-3496 ◽  
Author(s):  
Tuomas Hämälä ◽  
Tiina M. Mattila ◽  
Päivi H. Leinonen ◽  
Helmi Kuittinen ◽  
Outi Savolainen
Keyword(s):  
Seed Germination ◽  
Reproductive Isolation ◽  
Arabidopsis Lyrata

Evolution of Flowers, Pollination, and Plant Diversity

2011 ◽  
Author(s):  
Pat Willmer
Keyword(s):  
Reproductive Isolation ◽  
Genetic Drift ◽  
Plant Diversity ◽  
Character Displacement ◽  
Good Evidence ◽  
Early Evolution ◽  
Evolutionary Divergence ◽  
Floral Variation ◽  
Character Correlations ◽  
Animal Pollination

This chapter examines the evolution of flowers, pollination, and plant diversity. There is good evidence for pollinator-mediated selection and appropriate trait heritability in flowers, and there are well-established mechanisms by which this could bring about floral change, reproductive isolation, and evolutionary divergence or specialization. The chapter first considers the origin and early evolution of flowers before discussing the diversification of angiosperms. It then explores the advantages of animal pollination and goes on to discuss the extent to which pollination may have contributed to floral variation, plant speciation, and plant diversification. In particular, it explains whether pollinators select for floral divergence and describes five ways in which floral divergence could arise by selection: adaptation to distinct niches, character displacement, adaptive “wandering,” character correlations, and genetic drift.

scholarly journals Limited phenological and pollinator-mediated isolation among selfing and outcrossing Arabidopsis lyrata populations

2020 ◽  
Vol 287 (1939) ◽  
pp. 20202323
Author(s):  
Courtney E. Gorman ◽  
Lindsay Bond ◽  
Mark van Kleunen ◽  
Marcel E. Dorken ◽  
Marc Stift
Keyword(s):  
Reproductive Isolation ◽  
Mating System ◽  
Common Garden ◽  
Common Garden Experiment ◽  
Pollinator Visitation ◽  
Arabidopsis Lyrata ◽  
Pollinator Preference ◽  
Pollination Mechanisms ◽  
Self Fertilization ◽  
Mechanistic Basis

Transitions from outcrossing to selfing have been a frequent evolutionary shift in plants and clearly play a role in species divergence. However, many questions remain about the initial mechanistic basis of reproductive isolation during the evolution of selfing. For instance, how important are pre-zygotic pre-pollination mechanisms (e.g. changes in phenology and pollinator visitation) in maintaining reproductive isolation between newly arisen selfing populations and their outcrossing ancestors? To test whether changes in phenology and pollinator visitation isolate selfing populations of Arabidopsis lyrata from outcrossing populations, we conducted a common garden experiment with plants from selfing and outcrossing populations as well as their between-population hybrids. Specifically, we asked whether there was isolation between outcrossing and selfing plants and their between-population hybrids through differences in (1) the timing or intensity of flowering; and/or (2) pollinator visitation. We found that phenology largely overlapped between plants from outcrossing and selfing populations. There were also no differences in pollinator preference related to mating system. Additionally, pollinators preferred to visit flowers on the same plant rather than exploring nearby plants, creating a large opportunity for self-fertilization. Overall, this suggests that pre-zygotic pre-pollination mechanisms do not strongly reproductively isolate plants from selfing and outcrossing populations of Arabidopsis lyrata .

scholarly journals Limited phenological and pollinator-mediated isolation among selfing and outcrossing Arabidopsis lyrata populations

2019 ◽  
Author(s):  
Courtney E. Gorman ◽  
Lindsay Bond ◽  
Mark van Kleunen ◽  
Marcel E. Dorken ◽  
Marc Stift
Keyword(s):  
Reproductive Isolation ◽  
Common Garden ◽  
F1 Hybrids ◽  
Common Garden Experiment ◽  
Pollinator Visitation ◽  
Arabidopsis Lyrata ◽  
Pollinator Preference ◽  
Pollination Mechanisms ◽  
Self Fertilization ◽  
Mechanistic Basis

AbstractTransitions from outcrossing to selfing have been a frequent evolutionary shift in plants and clearly play a role in species divergence. However, many questions remain about the initial mechanistic basis of reproductive isolation during the evolution of selfing. For instance, how important are prezygotic pre-pollination mechanisms (e.g. changes in phenology and pollinator visitation) in maintaining reproductive isolation between newly arisen selfing populations and their outcrossing ancestors? To test whether changes in phenology and pollinator visitation isolate selfing populations of Arabidopsis lyrata from outcrossing populations, we conducted a common garden experiment with plants from selfing and outcrossing populations as well as their F1 hybrids. Specifically, we asked whether there was isolation between outcrossing and selfing plants and their F1 hybrids through differences in 1) the timing or intensity of flowering; and/or 2) pollinator visitation. We found that phenology largely overlapped between plants from outcrossing and selfing populations. There were also no differences in pollinator preference related to mating system. Additionally, pollinators preferred to visit flowers on the same plant rather than exploring nearby plants, creating a large opportunity for self-fertilization. Overall, this suggests that prezygotic pre-pollination mechanisms do not strongly reproductively isolate plants from selfing and outcrossing populations of Arabidopsis lyrata.

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