Effects of Salinity Stress on Growth, Mineral Nutrient Accumulation and Biochemical Parameters of Seedlings of Three Citrus Rootstocks

Figures & data

Table 1. Summary of analysis of variance (ANOVA) for survivability, plant height, shoot diameter, leaf area, dry weights of root and shoot of citrus rootstocks after 90 days of irrigation with different levels of water salinity.

Source of variation	df				Mean squares
		Survivability	Plant height	Shoot diameter	Leaf area	Dry weight of root	Dry weight of shoot
Rootstocks	2	13097.77**	1539.93**	25.76**	59765.46**	11.18**	173.03**
Linear regression	1	12326.67**	1911.96**	37.13**	106454.09**	20.13**	342.53**
Water salinity	5	4591.11**	1051.76**	3.40**	23751.78**	9.06**	158.64**
Linear regression	1	22866.66**	5063.54**	16.77**	115486.10**	41.09**	757.58**
Interaction	10	704.44**	26.22**	0.10**	6077.05**	0.91**	11.12**
Residual	72	16.667	0.450	0.006	0.574	0.004	0.012
CV (%)		5.39	2.57	2.13	1.20	4.61	2.10

** Significant at P< 0.01.

Figure 1. Relationship between survivability and water salinity (A) and between plant height and water salinity (B) of citrus rootstocks after 90 days of irrigation with different levels of water salinity (R = Rootstocks, S = Water salinity, ** Significant at P< .01). Error bars on both axes represent standard error.

Figure 2. Relationship between shoot diameter and water salinity (A) and between leaf area and water salinity (B) of citrus rootstocks after 90 days of irrigation with different levels of water salinity (R = Rootstocks, S = Water salinity, ** Significant at P< .01). Error bars on both axes represent standard error.

Figure 3. Relationship between dry weight of root and water salinity (a) and between dry weight of shoot and water salinity (b) of citrus rootstocks after 90 days of irrigation with different levels of water salinity (R = Rootstocks, S = Water salinity, ** Significant at P< .01). Error bars on both axes represent standard error.

Table 2. Summary of analysis of variance (ANOVA) for Na, Cl, N, P, K, chlorophyll, and proline contents of citrus rootstocks after 90 days of irrigation with different levels of water salinity.

Source of variation	df				Mean squares
		Na	Cl	N	P	K	Chlorophyll	Proline
Rootstocks	2	13097.77**	1539.93**	6.25**	0.03**	1.83**	5.40**	57.15**
Linear regression	1	0.96**	5.97**	3.92**	0.06**	0.44**	5.44**	17.97ns
Water salinity	5	4591.11**	1051.76**	2.61**	0.04**	0.88**	1.76**	47.68**
Linear regression	1	6.56**	57.41**	12.31**	0.21**	4.29**	8.72**	228.35**
Interaction	10	704.44**	26.22**	0.27**	0.00**	0.13**	0.03**	8.14**
Residual	72	0.003	0.003	0.003	0.000	0.005	0.001	0.013
CV (%)		6.79	4.32	2.04	5.52	4.26	1.73	4.25

** Significant at P< 0.01; ns: not significant.

Figure 4. Relationship between Na content and water salinity (A) and between chloride content and water salinity (B) of citrus rootstocks after 90 days of irrigation with different levels of water salinity (R = Rootstocks, S = Water salinity, ** Significant at P< .01). Error bars on both axes represent standard error.

Figure 5. Relationship between amounts of nitrogen (N) and water salinity (a), phosphorous (P) and water salinity (b) and potassium (K) and water salinity (c) of citrus rootstocks after 90 days of irrigation with different levels of water salinity (R = Rootstocks, S = Water salinity, ** Significant at P< .01). Error bars on both axes represent standard error.

Figure 6. Relationship between amount of chlorophyll and water salinity (a) and between amount of proline and water salinity (b) of citrus rootstocks after 90 days of irrigation with different levels of water salinity (R = Rootstocks, S = Water salinity, ** Significant at P< .01). Error bars on both axes represent standard error.