. 2021 Mar 5;27(3):469–481. doi: 10.1007/s12298-021-00958-8

Table 2.

Effect of different concentrations of melatonin or tryptophan on photosynthetic pigments (mg/g fresh weight) of white lupine plants under different water irrigation requirements

WIR (%)	Treatment materials	Conc. (µM)	Chl a	Chl b	Carotenoids	Total pigments
100	Control	0	1.26^d	0.913^g	0.592^g	2.77^d
	Melatonin	50	1.38^ab	0.993^c	0.647^c	3.02^ab
		100	1.42^a	1.033^a	0.669^a	3.13^a
		150	1.34^bc	0.970^d	0.629^d	2.94^bc
	Tryptophan	100	1.32^c	0.954^f	0.622^e	2.90^c
		200	1.39^ab	1.012^b	0.653^b	3.06^a
		300	1.32^c	0.955^e	0.620^f	2.89^c
75	Control	0	0.98^hi	0.713ⁿ	0.459ⁿ	2.15^hij
	Melatonin	50	1.07^fg	0.784^k	0.504^k	2.36^fg
		100	1.18^e	0.854^h	0.554^h	2.59^e
		150	1.11^f	0.803^j	0.521^j	2.43^f
	Tryptophan	100	1.03^gh	0.745^m	0.483ⁿ	2.26^gh
		200	1.06^fg	0.768^l	0.498^l	2.33^fg
		300	1.17^e	0.845ⁱ	0.548ⁱ	2.56^e
50	Control	0	0.87^j	0.632^t	0.410^s	1.91^k
	Melatonin	50	0.96ⁱ	0.697^p	0.452^o	2.11^ij
		100	0.98^hi	0.712ⁿ	0.462ⁿ	2.16^hi
		150	0.97^hi	0.704^o	0.457ⁿ	2.13^ij
	Tryptophan	100	0.93ⁱ	0.671^s	0.435^r	2.03^j
		200	0.94ⁱ	0.680^r	0.441^q	2.06^ij
		300	0.95ⁱ	0.686^q	0.445^p	2.08^ij
LSD (5%)			0.05	0.002	0.002	0.10

Mean values with the same superscripts are not significantly different at p ≤ 0.05

WIR, water irrigation requirements