Table 2.

Leaf photosynthetic parameters, initial Rubisco activity and leaf chlorophyll fluorescence parameters of mycorrhizal (+M) and non-mycorrhizal (+NM) watermelon seedlings grown under WW and DS conditions.

Water condition	Inoculation	Pn (μmol CO2 m-2 s-1)	Tr (mmol H2O m-2 s-1)	iWUE (μmol CO2 mmol H2O)	Initial Rubisco activity (μmol min-1 g-1FW)	Fv/Fm	ΦPSII	ETR	qP	NPQ
WW	NM	16.82 ± 0.36b	3.95 ± 0.09a	4.26 ± 0.08a	178.25 ± 11.78a	0.77 ± 0.01b	0.50 ± 0.00b	63.78 ± 0.37b	0.76 ± 0.01b	0.40 ± 0.02a
	M	17.50 ± 0.65a	4.04 ± 0.15a	4.33 ± 0.03ba	200.10 ± 18.46a	0.79 ± 0.01a	0.54 ± 0.01a	68.78 ± 0.67a	0.79 ± 0.02a	0.41 ± 0.02a
DS	NM	8.40 ± 0.76b	1.34 ± 0.09a	6.29 ± 0.52b	75.60 ± 9.80b	0.69 ± 0.02b	0.41 ± 0.02b	52.26 ± 2.13b	0.70 ± 0.01b	0.50 ± 0.03b
	M	11.22 ± 0.75a	1.51 ± 0.17a	7.44 ± 0.45a	106.76 ± 13.44a	0.72 ± 0.00a	0.46 ± 0.01a	58.02 ± 0.90a	0.75 ± 0.01a	0.55 ± 0.02a
Significance
Watering (W)		∗∗	∗∗	∗∗	∗∗	∗∗	∗∗	∗∗	∗∗	∗∗
Inoculation (I)		∗∗	ns	∗	∗	∗∗	∗∗	∗∗	∗∗	∗∗
W × I		∗	ns	∗	ns	ns	ns	ns	ns	∗

T-test was performed to compare differences between inoculation treatments under the same water treatment. Different letters following the values indicate significant differences between treatments at P < 0.05. Two-way ANOVA output: ns, not significant; ^∗P < 0.05, ^∗∗P < 0.01. Values represent the means ± SD (n = 5).