Abstract
Knowledge of natural variation among ecotypes and recombinant inbred lines of Arabidopsis thaliana L. Heynh for season‐long water‐use efficiency (WUE, moles of carbon accumulated per mole of water used) is useful in the design of experiments to understand the genetic control of this phenomenon. Water‐use efficiency among 31 container‐grown Arabidopsis ecotypes ranged from a high of 2.40 to a low of 1.86 mg/g (grams of dry aerial biomass per gram of water used). Genetic variance for WUE was observed among 80 F5 recombinant inbred lines (RILs) derived from a cross between the highest (Lip‐0) by the lowest (Edi‐0) ecotype. The heritability of WUE was calculated as 0.18 ± 0.07. The mean WUE for the ten highest and ten lowest RILs was 2.42 and 1.05 mg/g, respectively. A significant difference was observed in the composition of stable isotopes of plant carbon (δ13C) between the mean of the ten highest (‐31.23±) and the mean of the ten lowest (‐31.96±) RILs based on WUE. Characterization of the 80 RILs provides a structured population for further genetic and physiologic study of WUE.
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