Table 1.

Variations in fluorescence parameters and chlorophyll content of C. paliurus leaves among different treatments.

Treatments	NPQ	ETR	Fv/Fm	Chl a content (mg g-1)	Chl b content (mg g-1)
						CK	2.17 ± 0.12 c	0.72 ± 0.09 a	0.70 ± 0.06 ab	0.81 ± 0.05 b	0.38 ± 0.04 b
NaHS	1.96 ± 0.14 c	0.68 ± 0.05 a	0.78 ± 0.02 a	1.12 ± 0.06 a	0.41 ± 0.02 ab
SNP	2.17 ± 0.30 c	0.66 ± 0.08 a	0.76 ± 0.02 a	1.21 ± 0.17 a	0.44 ± 0.02 a
NaCl	3.93 ± 0.44 a	0.37 ± 0.04 c	0.54 ± 0.04 c	0.44 ± 0.01 d	0.20 ± 0.02 c
NaHS+NaCl	3.12 ± 0.47 b	0.46 ± 0.05 bc	0.63 ± 0.09 bc	0.61 ± 0.01 c	0.24 ± 0.03 c
SNP+NaCl	3.31 ± 0.22 b	0.50 ± 0.03 b	0.66 ± 0.05 b	0.66 ± 0.06 bc	0.21 ± 0.01 c

Different small letters indicate a significant difference (P < 0.05) among the treatments. Code annotation: CK (no salt addition and only irrigation with distilled water), SNP (no salt addition, spraying with 0.25mM sodium nitroprusside (a NO donor), and irrigation with distilled water), NaHS (no salt addition, spraying with 0.5mM sodium hydrosulfide (a H₂S donor), and irrigation with distilled water), NaCl (0.4% NaCl treatment and irrigation with 0.4% NaCl solution), SNP+NaCl (0.4% NaCl treatment, spraying with 0.25mM SNP and irrigation with 0.4% NaCl solution), and NaHS+NaCl (0.4% NaCl treatment, spraying with 0.5mM NaHS and irrigation with 0.4% NaCl solution), the same below.