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Table 2 Whole plant transpiration (TrIRGA, mg H2O m−2 s−1), photosynthesis (An, µmol CO2 m−2 s−1) and intrinsic water use efficiency (iWUE, µmol CO2 mg−1 H2O) before and after foliar application of ABA to the leaves of the wild-type (WT) barley genotype Steptoe and the ABA-deficient mutant Az34

From: Whole plant chamber to examine sensitivity of cereal gas exchange to changes in evaporative demand

  Whole plant TrIRGA Whole plant An Whole plant iWUE
WT 75.3 ± 5.0 11.9 ± 0.9 0.16 ± 0.01
WT + ABA 62.4 ± 10.7 12.4 ± 1.7 0.20 ± 0.02
% change after ABA treatment − 17 N.s. + 26
Az34 65.5 ± 3.8 10.3 ± 0.1 0.16 ± 0.01
Az34 + ABA 39.4 ± 6.8 7.2 ± 1.4 0.18 ± 0.01
% change after ABA treatment − 40 − 30 + 18
Genotype < 0.001 < 0.001 0.093
ABA treatment < 0.001 0.025 < 0.001
Genotype * ABA treatment 0.053 0.005 0.093
  1. The percentage change in response to ABA treatments is calculated when significant. Data are mean ± SE of 4 replicates. Results from two-way ANOVA (P values) are presented for Genotype, ABA treatment and their interaction
  2. N.s. not significant