Genetic variation in Arabidopsis thaliana for night-time leaf conductance |
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Authors: | Christman Mairgareth A Richards James H McKay John K Stahl Eli A Juenger Thomas E Donovan Lisa A |
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Institution: | Department of Land, Air and Water Resources, University of California, Davis, CA 95616, USA,;Department of Bioagricultural Sciences and Pest Management, Colorado State University, Fort Collins, CO 80523, USA,;Department of Biology, University of Massachusetts, Dartmouth, MA 02747, USA,;Section of Integrative Biology, University of Texas, Austin, TX 78712, USA and;Department of Plant Biology, University of Georgia, Athens, GA 30602, USA |
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Abstract: | Night-time leaf conductance ( g night) and transpiration may have several adaptive benefits related to plant water, nutrient and carbon relations. Little is known, however, about genetic variation in g night and whether this variation correlates with other gas exchange traits related to water use and/or native habitat climate. We investigated g night in 12 natural accessions and three near isogenic lines (NILs) of Arabidopsis thaliana . Genetic variation in g night was found for the natural accessions, and g night was negatively correlated with native habitat atmospheric vapour pressure deficit (VPDair), suggesting lower g night may be favoured by natural selection in drier habitats. However, there were also significant genetic correlations of g night with daytime gas exchange traits expected to affect plant fitness i.e. daytime leaf conductance, photosynthesis and intrinsic water-use efficiency (WUEi)], indicating that selection on daytime gas exchange traits may result in indirect selection on g night. The comparison of three NILs to their parental genotypes identified one quantitative trait locus (QTL) contributing to variation in g night. Further characterization of genetic variation in g night within and among populations and species, and of associations with other traits and native habitats will be needed to understand g night as a putatively adaptive trait. |
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Keywords: | adaptation FRIGIDA intraspecific variation night-time transpiration nocturnal stomatal conductance |
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