Abstract

Relatively few studies have investigated how geography, environmental factors, and genetics affect floral trait variation. We used mixed-mating Collinsia heterophylla Buist to explore variation in a suite of floral traits related to mating system in populations representing four geographic regions of California, USA, and relate this variation to geography, climatic factors, and local site characteristics. We evaluated the environmental vs. genetic trait variability in the greenhouse. Stage of anther-stigma contact correlated positively with temperature, stage of stigma receptivity was negatively associated with vegetation cover, and flower size differed among populations without any clear relation to environmental factors. Greenhouse data indicated heritability for stage of anther-stigma contact, flower size, and time to flowering, and positive correlations between field and greenhouse for stage of stigma receptivity and flower size; however, stage of anther-stigma contact showed a high degree of environmental influence. Stage of anther-stigma contact covaried positively with stage of stigma receptivity and flower size across maternal families, indicating genetic correlations between traits. In conclusion, phenotypic floral variation within mixed-mating C. heterophylla is mostly determined by a genetic component. Geography, environment, and genetics affect traits differently, suggesting that ecological and evolutionary processes contribute to shaping variability in mating system-related traits.

Keywords

climate; genetic correlation; heritability; mating system evolution; phenotypic plasticity

Published in

Botany
2017, Volume: 95, number: 2, pages: 121-138

SLU Authors

• Lankinen, Åsa

  • Department of Plant Protection Biology, Swedish University of Agricultural Sciences
    
  • Lund University

UKÄ Subject classification

Botany


Publication identifier

DOI: https://doi.org/10.1139/cjb-2016-0014

Permanent link to this page (URI)

https://res.slu.se/id/publ/80167