TABLE 1.
Biochemical analyses in two spring wheat accessions: pigment content, expressed as chlorophyll amount per leaf area, chlorophyll a/chlorophyll b ratio, and as molar ratio (mol pigment/mol chlorophyll a)
| Chl a + b | Violaxanthin | Antheraxanthin | Lutein | β‐Carotene | ABA | MDA | ||
|---|---|---|---|---|---|---|---|---|
| μg/mm2 | Chl a/b | mol/mol Chl a | mol/mol Chl a | mol/mol Chl a | mol/mol Chl a | μg/g DW | nmol/mg DW | |
| UK WW | 0.585 ± 0.053 | 3.936 ± 0.141 | 0.069 ± 0.008 | 0.0086 ± 0.0039 | 0.136 ± 0.015 | 0.128 ± 0.016 | 1.772 ± 3.188 | 10.763 ± 3.231 |
| IR WW | 0.525 ± 0.052 | 3.870 ± 0.103 | 0.065 ± 0.003 | 0.0068 ± 0.0033 | 0.140 ± 0.007 | 0.126 ± 0.010 | 1.986 ± 1.265 | 7.998 ± 1.867 |
| UK DS | 0.530 ± 0.052 | 3.764 ± 0.136 | 0.067 ± 0.005 | 0.0079 ± 0.0042 | 0.166 ± 0.024 | 0.130 ± 0.009 | 13.112 ± 6.721 | 9.507 ± 1.116 |
| IR DS | 0.526 ± 0.052 | 3.685 ± 0.170 | 0.062 ± 0.003 | 0.0063 ± 0.0040 | 0.149 ± 0.007 | 0.126 ± 0.005 | 26.978 ± 2.995 | 8.832 ± 1.016 |
| p‐value | ns | ns | ns | ns | 0.006 | ns | 5.16E‐08 | ns |
Note: The p‐value refers to the control versus drought comparison by two‐way Analysis of variance analysis. ns = not significant (p ≥ .05).
Abbreviations: ABA, abscisic acid; DW, dry weight; MDA, malondialdehyde.