TABLE 3.

Effects of Spd application on Na⁺/Mg²⁺ ratio under salt stress in the oat seedlings.

Variety	Organ	Ratio	Treatment
			CK	CS	S1	SS1	S2	SS2
Caoyou 1	First leaf	Na+/Mg2+	1.51 ± 0.17d	1.83 ± 0.63d	40.47 ± 5.79b	21.61 ± 2.95c	88.90 ± 3.57a	86.60 ± 11.81a
	Second and third leaves	Na+/Mg2+	1.05 ± 0.29d	1.19 ± 0.12d	50.90 ± 4.12b	40.41 ± 4.53c	84.43 ± 10.49a	76.99 ± 7.54a
	stem	Na+/Mg2+	1.93 ± 0.34c	1.89 ± 0.10c	40.17 ± 4.92b	36.01 ± 3.33b	54.08 ± 0.58a	52.70 ± 3.70a
	root	Na+/Mg2+	1.87 ± 0.24c	2.12 ± 0.49c	31.88 ± 4.22b	24.35 ± 3.64b	59.11 ± 13.16a	54.19 ± 4.47a
Baiyan 2	First leaf	Na+/Mg2+	1.88 ± 0.18d	1.82 ± 0.16d	58.39 ± 4.22b	33.76 ± 0.12c	78.55 ± 2.35a	77.42 ± 13.62a
	Second and third leaves	Na+/Mg2+	2.06 ± 0.48c	2.26 ± 0.43c	52.05 ± 1.96b	46.61 ± 5.16b	69.36 ± 0.96a	63.89 ± 5.28a
	stem	Na+/Mg2+	1.96 ± 0.34d	2.05 ± 0.39d	62.35 ± 2.49b	53.60 ± 9.63c	71.41 ± 5.00a	64.00 ± 1.24ab
	root	Na+/Mg2+	1.80 ± 0.24c	1.69 ± 0.05c	19.50 ± 2.20b	16.24 ± 3.15b	31.19 ± 7.77a	28.33 ± 1.36a

CK, Nutrient solution + distilled water; CS, Nutrient solution + 0.75 mM Spd; S1, 70 mM salt + distilled water; SS1, 70 mM salt + 0.75 mmol/L Spd; S2, 100 mM salt + distilled water; SS2, 100 mM salt + 0.75 mmol/L Spd. Different lowercase letters indicate significant differences between treatments at 0.05 level.