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The genetic correlation between flower size and water use efficiency in monkeyflowers
John K Kelly1, Liza M Holeski, H S Arathi
1Department of Ecology and Evolutionary Biology, University of Kansas, 1200 Sunnyside Avenue, Lawrence, KS 66045-7534, USA.
Evolutionary Ecology Research
|August 3, 2010
Summary
Drought stress impacts water use efficiency differently across flower sizes in yellow monkeyflowers. Small-flowered plants show lower water use efficiency under drought, suggesting a link between flower size and drought adaptation.
Area of Science:
- Plant physiology
- Evolutionary biology
- Ecology
Background:
- Flower size is a key trait in plant evolution, influenced by various environmental factors.
- Drought stress poses a significant challenge to plant survival and reproduction, potentially constraining evolutionary trajectories.
- Understanding the interplay between floral traits and physiological responses to stress is crucial for predicting plant adaptation.
Purpose of the Study:
- To investigate whether water loss during drought stress constrains the evolution of flower size.
- To examine the relationship between flower size genotypes and water use efficiency under varying water availability.
- To determine if genetic correlations exist between floral traits and physiological water use.
Main Methods:
- Utilized a genetically diverse population of Mimulus guttatus (yellow monkeyflower).
- Grew plants of small, medium, and large flowered genotypes under well-watered and drought-stress conditions.
- Measured water use efficiency (WUE) using stable carbon isotopes.
Main Results:
- No significant difference in WUE was observed among flower size genotypes under well-watered conditions.
- Under drought stress, small-flowered genotypes exhibited substantially lower WUE compared to medium and large-flowered genotypes.
- A genetic correlation between floral size and water use efficiency under drought was identified.
Conclusions:
- Water loss during drought stress may act as a physiological constraint on the evolution of flower size in Mimulus guttatus.
- The findings suggest that selection on flower size can indirectly influence water use efficiency, and vice versa, due to genetic correlations.
- This study highlights the complex interactions between floral morphology and physiological drought responses in shaping plant evolution.
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