Citrulline Is an Important Biochemical Indicator in Tolerance to Saline and Drought Stresses in Melon
Table 2
Osmotic potential in the leaves of melon genotypes exposed to 250 mM NaCl salt and 45 mM PEG (−1.0 MPa) drought stresses (−MPa).
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
0.80 ± 0.2
0.75 ± 0.1e
0.79 ± 0.02
0.99 ± 0.1
0.85
CU 94
0.74 ± 0.1u
0.77 ± 0.1tu
0.78 ± 0.01
0.97 ± 0.1f
CU 196
0.85 ± 0.1
0.85 ± 0.1
0.90 ± 0.02
0.93 ± 0.5f
CU 280
0.86 ± 0.1
0.83 ± 0.2
0.87 ± 0.1
0.95 ± 0.3
Salt
CU 52
1.37 ± 0.4fg
1.78 ± 0.1de
1.86 ± 0.1
1.87 ± 0.2
1.52
CU 94
1.19 ± 0.2
2.15 ± 0.2b
2.01 ± 0.1bc
2.46 ± 0.7a
CU 196
1.15 ± 0.1
1.09 ± 0.2
1.24 ± 0.2
1.27 ± 0.2
CU 280
1.18 ± 0.2
1.08 ± 0.2
1.33 ± 0.2
1.33 ± 0.1
Drought
CU 52
1.01 ± 0.2
1.10 ± 0.1
1.87 ± 0.1
2.03 ± 0.0bc
1.45
CU 94
0.84 ± 0.0
1.41 ± 0.2f
1.32 ± 0.0
2.16 ± 0.2b
CU 196
1.02 ± 0.1
1.09 ± 0.2
1.95 ± 0.1
1.69 ± 0.1e
CU 280
1.02 ± 0.2
1.08 ± 0.1
1.74 ± 0.0de
1.92 ± 0.1
Mean of times
1.00
1.16
1.39
1.54
Mean of genotypes
CU 52
CU 94
CU 196
CU 280
1.35
1.40
1.17
1.18
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–u letters are showed statistical groups.