Table 2 Effect of application of melatonin (0, 75 and 150 µM) on photosynthetic parameters of bitter melon (Momordica charantia) under salt stress (0, 50 and 100 mM NaCl) conditions

0

0

38.15 ± 0.76^a

2.91 ± 0.02^b

0.590 ± 0.002^a

0.289 ± 0.004^g

0.183 ± 0.003^f

75

37.80 ± 1.02^a

2.96 ± 0.01^b

0.590 ± 0.006^a

0.284 ± 0.005^g

0.179 ± 0.003^f

150

39.02 ± 1.07^a

3.05 ± 0.04^a

0.594 ± 0.005^a

0.278 ± 0.004^g

0.171 ± 0.001^g

50

0

32.2 ± 0.68^c

2.31 ± 0.03^e

0.431 ± 0.002^d

0.395 ± 0.011^d

0.233 ± 0.004^c

75

34.2 ± 0.71^b

2.48 ± 0.02^d

0.477 ± 0.006^c

0.352 ± 0.004^e

0.214 ± 0.004^d

150

35.57 ± 0.48^b

2.78 ± 0.02^c

0.516 ± 0.012^b

0.326 ± 0.009^f

0.200 ± 0.004^e

100

0

28.59 ± 0.77^d

1.66 ± 0.06^h

0.264 ± 0.004^g

0.595 ± 0.005^a

0.260 ± 0.003^a

75

30.84 ± 0.66^c

1.77 ± 0.02^g

0.301 ± 0.010^f

0.545 ± 0.011^b

0.253 ± 0.001^a

150

31.69 ± 1.07^c

1.91 ± 0.05^f

0.345 ± 0.008^e

0.505 ± 0.007^c

0.242 ± 0.002^b