ArticleAmerican journal of botany2021
Evolutionary divergence of potential drought adaptations between two subspecies of an annual plant: Are trait combinations facilitated, independent, or constrained?
Article in American journal of botany, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 7 papers.
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7 citing papers in PubMed, 13 citations in OpenAlex.
- Introgression despite minimal hybridization: mating system modulates phenotypic associations with introgression in Clarkia.The New phytologist · 2026Article
- Biotic and Abiotic Drivers of Phenotypic Diversity in the GenusPlants (Basel, Switzerland) · 2026Review
- The extent of introgression between incipientProceedings of the National Academy of Sciences of the United States of America · 2024Article
- Negative interaction effect of heat and drought stress at the warm end of species distribution.Oecologia · 2024Article
- Rapid evolution during climate change: demographic and genetic constraints on adaptation to severe drought.Proceedings. Biological sciences · 2023Article
- The influence of genetic architecture on responses to selection under drought in rice.Evolutionary applications · 2022Article
- Evolutionary divergence of potential drought adaptations between two subspecies of an annual plant: Are trait combinations facilitated, independent, or constrained?American journal of botany · 2021Article
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2 authors at 1 institution in 1 country.
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Abstract
premiseWhether drought-adaptation mechanisms tend to evolve together, evolve independently, or evolve constrained by genetic architecture is incompletely resolved, particularly for water-relations traits besides gas exchange. We addressed this issue in two subspecies of Clarkia xantiana (Onagraceae), California winter annuals that separated approximately 65,000 years ago and are adapted, partly by differences in flowering time, to native ranges differing in precipitation.
methodsIn these subspecies and in recombinant inbred lines (RILs) from a cross between them, we scored traits related to drought adaptation (timing of seed germination and of flowering, succulence, pressure-volume curve variables) in common environments.
resultsThe subspecies native to more arid environments (parviflora) exhibited slower seed germination in saturated conditions, earlier flowering, and greater succulence, likely indicating superior drought avoidance, drought escape, and dehydration resistance via water storage. The other subspecies (xantiana) had lower osmotic potential at full turgor and lower water potential at turgor loss, implying superior dehydration tolerance. Genetic correlations among RILs suggest facilitated evolution of some trait combinations and independence of others. Where genetic correlations exist, subspecies differences fell along them, with the exception of differences in succulence and turgor loss point. In that case, subspecies difference overcame genetic correlations, possibly reflecting strong selection and/or antagonistic genetic correlations with other traits.
conclusionsClarkia xantiana subspecies' differ in multiple mechanisms of drought adaptation. Genetic architecture generally does not seem to have constrained the evolution of these mechanisms, and it may have facilitated the evolution of some of trait combinations.
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