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Quantitative Variation in Water-Use Efficiency across Water Regimes and Its Relationship with Circadian, Vegetative, Reproductive, and leaf gas-exchange traits

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Molecular Plant 2012年第3期5卷 653-668页

作者： Christine E. Edwards Brent E. Ewers C. Robertson McClung Ping Lou Cynthia Weinig Department of Botany University of Wyoming Laramie WY 82071 USA Present address： USACE ERDC Environmental Laboratory 3909 Halls Ferry Road Vicksburg MS 39180 USA Program in Ecology University of Wyoming Laramie WY 82071 USA Department of Biological Sciences Dartmouth College Hanover NH 03755 USA

Drought limits light harvesting, resulting in lower plant growth and reproduction. One trait important for plant drought response is water-use efficiency （WUE）. We investigated （1） how the joint genetic architecture of WUE, reproductive characters, and vegetative traits changed across drought and well-watered conditions, （2） whether traits with distinct developmental bases （e.g. leaf gas exchange versus reproduction） differed in the environmental sensitivity of their genetic architecture, and （3） whether quantitative variation in circadian period was related to drought response in Brassica rapa. Overall, WUE increased in drought, primarily because stomatal conductance, and thus water loss, declined more than carbon fixation. Genotypes with the highest WUE in drought expressed the lowest WUE in well-watered conditions, and had the largest vegetative and floral organs in both treatments. Thus, large changes in WUE enabled some genotypes to approach vegetative and reproductive trait optima across environments. The genetic architecture differed for gas-exchange and vegetative traits across drought and well-watered conditions, but not for floral traits. Correlations between circadian and leaf gas-exchange traits were significant but did not vary across treatments, indicating that circadian period affects physiological function regardless of water availability. These results suggest that WUE is important for drought tolerance in Brassica rapa and that artificial selection for increased WUE in drought will not result in maladaptive expression of other traits that are correlated with WUE.

关键词： Brassica rapa drought ecophysiology floral traits G matrix leaf gas-exchange traits water-use efficiency vegetative traits

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