Except for the 200 mmol·L −1 NaCl treatment, the SP in other treatments was higher than that in CK, and its range of increase compared with CK showed a decreasing trend with the extension of the treatment time ( Figure 1 ).
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Growth and Physiological Response of <i>Viola tricolor</i> L. to NaCl and NaHCO<sub>3</sub> Stress.
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The sentences
Malondialdehyde (MDA) also showed an increasing trend [ 4 , 5 , 6 , 7 ], while the activities of antioxidant enzymes, such as superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT) increase under low NaCl concentrations and gradually decrease with an increase in NaCl concentration [ 8 , 9 ].
tricolor showed a trend of first increasing and then decreasing [ 21 , 22 ].