Citrulline Is an Important Biochemical Indicator in Tolerance to Saline and Drought Stresses in Melon
Table 4
The proline in the leaves of melon genotypes exposed to 250 mM NaCl salt and 45 mM PEG (−1.0 MPa) drought stresses (mol gDW−1).
Treatment
Genotype
38 DAS, 3 days in stress
41 DAS, 6 days in stress
44 DAS, 9 days in stress
47 DAS, 12 days in stress
Mean of treatments
Control
CU 52
0.74 ± 0.1r
1.10 ± 0.1
1.51 ± 0.2
1.58 ± 0.1
1.61
CU 94
1.35 ± 0.2
1.02 ± 0.1
1.67 ± 0.8
1.87 ± 0.1
CU 196
1.35 ± 0.2
1.53 ± 0.1
2.84 ± 0.2
3.03 ± 0.1de
CU 280
1.04 ± 0.1
1.09 ± 0.1
1.75 ± 0.2
2.24 ± 0.2
Salt
CU 52
0.90 ± 0.1
0.97 ± .02fqr
2.12 ± 0.6
1.70 ± 0.2d
2.19
CU 94
1.17 ± 0.5
1.88 ± 0.1
1.56 ± 0.3
1.33 ± 0.1
CU 196
1.32 ± 0.3
2.79 ± 0.3a
4.18 ± 0.3a
7.19 ± 2.0a
CU 280
1.13 ± 0.2
1.06 ± 0.1
2.58 ± 0.4
3.15 ± 0.1d
Drought
CU 52
1.15 ± 0.1
1.03 ± 0.1
2.50 ± 0.2
3.79 ± 0.2bc
2.52
CU 94
0.81 ± 0.3r
1.05 ± 0.1
2.41 ± 0.4
3.05 ± 0.5de
CU 196
1.48 ± 0.2
2.63 ± 0.2
4.41 ± 0.4b
6.83 ± 1.8a
CU 280
1.12 ± 0.2
1.71 ± 0.2
2.66 ± 0.1
3.79 ± 0.4c
Mean of times
1.13
1.49
2.51
3.29
Mean of genotypes
CU 52
CU 94
CU 196
CU 280
1.59
1.60
3.30
1.94
DAS: days after sowing. Data shown were means of 3 independent plants (replicates). Data in the table bearing the same letter are not significant at 5% probability. Differing genotype responses to salt and drought stresses: CU 52 sensitive, CU 94 sensitive, CU 196 tolerant, and CU 280 moderately tolerant. Significance of interactions: Genotype, Treatment, Time, Genotype × Treatment, Genotype × Time, Treatment × Time, Genotype × Treatment × Time. The a–r letters are showed statistical groups.
