Citrulline Is an Important Biochemical Indicator in Tolerance to Saline and Drought Stresses in Melon
Table 1
Citrulline in the leaves of melon genotypes exposed to 250 mM NaCl salt and 45 mM PEG (−1.0 MPa) drought stresses (μmol 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
7.81 ± 1.0
3.95 ± 0.4
4.34 ± 0.2
5.56 ± 1.3
7.19
CU 94
7.93 ± 3.4
9.22 ± 5.2
6.01 ± 0.6
6.68 ± 1.2
CU 196
6.55 ± 0.8
7.63 ± 0.5
5.63 ± 0.7
6.61 ± 1.9
CU 280
9.35 ± 1.5
8.93 ± 0.3
8.97 ± 0.4
9.80 ± 0.3
Salt
CU 52
6.37 ± 2.1
3.40 ± 5.3o
10.78 ± 4.3
11.68 ± 1.8
11.75
CU 94
7.75 ± 1.2
10.07 ± 6.6
10.36 ± 1.8
8.49 ± 1.7
CU 196
7.57 ± 1.1
8.45 ± 0.1
19.16 ± 8.3b
25.10 ± 2.6a
CU 280
10.98 ± 1.3
10.39 ± 1.6
18.44 ± 0.3b
18.95 ± 0.7b
Drought
CU 52
7.91 ± 2.0
13.64 ± 1.3
11.34 ± 0.7
11.76 ± 0.6
15.26
CU 94
10.70 ± 1.9
11.73 ± 2.5
21.36 ± 8.5ab
18.52 ± 1.3b
CU 196
12.85 ± 0.9
11.73 ± 0.4
23.91 ± 7.8a
24.07 ± 2.2a
CU 280
13.76 ± 0.5
13.64 ± 3.6
17.56 ± 3.6bc
19.47 ± 1.8b
Mean of times
9.13
9.40
13.16
13.89
Mean of genotypes
CU 252
CU 94
CU 196
CU 280
7.27
10.74
13.27
13.35
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–o letters are showed statistical groups.
