Figure 1.
The appearance of whole plants in T. grandis seedlings.
Treatments: T1, distilled water without SA; T2, distilled water with 0.5 mmol SA; T3, 0.2% NaCl without SA; T4, 0.2% NaCl with 0.5 mmol SA; T5, 0.4% NaCl without SA; and T6, 0.4% NaCl with 0.5 mmol SA.
Table 1.
Effects of SA on the dry matter of the shoots, roots, and roots+shoots in T. grandis grown under salt stress (means±SD).
Figure 2.
Effects of SA on the RWC (A) and proline content (B) in T. grandis grown under salt stress conditions (means ± SD).
Treatments: T1, distilled water without SA; T2, distilled water with 0.5 mmol SA; T3, 0.2% NaCl without SA; T4, 0.2% NaCl with 0.5 mmol SA; T5, 0.4% NaCl without SA; and T6, 0.4% NaCl with 0.5 mmol SA. Different letters indicate significant differences (P<0.05) according to an LSD test; the same letter indicates no significant differences between the treatments, n = 5.
Table 2.
Effects of SA treatments on the net photosynthetic rate (Pn), internal carbon dioxide concentration (Ci), transpiration rate (Tr), and stomatal conductance (Gs) in T. grandis grown under salt stress conditions.
Figure 3.
Effects of SA on the chl (a+b) (A) and soluble protein contents (B) in T. grandis grown under salt stress conditions (means ± SD).
Treatments: T1, distilled water without SA; T2, distilled water with 0.5 mmol SA; T3, 0.2% NaCl without SA; T4, 0.2% NaCl with 0.5 mmol SA; T5, 0.4% NaCl without SA; and T6, 0.4% NaCl with 0.5 mmol SA. Different letters indicate significant differences (P<0.05) according to an LSD test; the same letter indicates no significant differences between the treatments, n = 5.
Figure 4.
Influence of the SA treatments on the SOD (A), CAT (B), and POD (C) activities in T. grandis grown under salt stress conditions.
Treatments: T1, distilled water without SA; T2, distilled water with 0.5 mmol SA; T3, 0.2% NaCl without SA; T4, 0.2% NaCl with 0.5 mmol SA; T5, 0.4% NaCl without SA; and T6, 0.4% NaCl with 0.5 mmol SA. Different letters indicate significant differences (P<0.05) according to an LSD test, n = 5.
Figure 5.
Effects of the SA treatments on the electrolyte leakage rate (A) and MDA contents (B) in T. grandis seedlings grown under salt stress conditions.
Treatments: T1, distilled water without SA; T2, distilled water with 0.5 mmol SA; T3, 0.2% NaCl without SA; T4, 0.2% NaCl with 0.5 mmol SA; T5, 0.4% NaCl without SA; and T6, 0.4% NaCl with 0.5 mmol SA. Different letters indicate significant differences (P<0.05) according to an LSD test, n = 5.
Figure 6.
Relationship between MDA content and activities of SOD (A), CAT (B) and POD (C), and between REC and activities of SOD (D), CAT (E) and POD (F), respectively in T. grandis seedlings grown under 0.2% and 0.4% salt stress conditions.
Each point represents the mean of 5 seedlings. *and **Significant at P<0.05 and P<0.01, respectively.