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 |