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 ± 0.2q--u	0.75 ± 0.1^e	0.79 ± 0.02s--u	0.99 ± 0.1l--s	0.85
	CU 94	0.74 ± 0.1^u	0.77 ± 0.1^tu	0.78 ± 0.01r--u	0.97 ± 0.1^f
	CU 196	0.85 ± 0.1q--u	0.85 ± 0.1p--u	0.90 ± 0.02o--u	0.93 ± 0.5^f
	CU 280	0.86 ± 0.1p--u	0.83 ± 0.2q--u	0.87 ± 0.1o--u	0.95 ± 0.3m--u
Salt	CU 52	1.37 ± 0.4^fg	1.78 ± 0.1^de	1.86 ± 0.1c--e	1.87 ± 0.2c--e	1.52
	CU 94	1.19 ± 0.2g--l	2.15 ± 0.2^b	2.01 ± 0.1^bc	2.46 ± 0.7^a
	CU 196	1.15 ± 0.1g--n	1.09 ± 0.2j--p	1.24 ± 0.2f--k	1.27 ± 0.2f--j
	CU 280	1.18 ± 0.2g--m	1.08 ± 0.2j--p	1.33 ± 0.2f--h	1.33 ± 0.1f--h
Drought	CU 52	1.01 ± 0.2k--r	1.10 ± 0.1h--o	1.87 ± 0.1c--e	2.03 ± 0.0^bc	1.45
	CU 94	0.84 ± 0.0q--u	1.41 ± 0.2^f	1.32 ± 0.0f--i	2.16 ± 0.2^b
	CU 196	1.02 ± 0.1k--q	1.09 ± 0.2i--p	1.95 ± 0.1b--d	1.69 ± 0.1^e
	CU 280	1.02 ± 0.2k--q	1.08 ± 0.1j--p	1.74 ± 0.0^de	1.92 ± 0.1c--e
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.