Effect of fulvic acid on the growth and physiological and biochemical char-acteristics of Brassica campestris L.ssp.chinensis var.utilis Tsen et Lee.under Ca(NO3)2 stress
The yield and quality of Brassica campestris L.ssp.chinensis var.utilis Tsen et Lee.can be seriously af-fected by soil secondary salinization.As a full water-soluble organic substance,fulvic acid(FA)played an active role in relieving salt stress in plants.The effects of fulvic acid(FA)on the growth and physiological and biochemical indexes of B.campestris L.seedlings under Ca(NO3)2 stress were studied,using Jinqiuhong No.2 as the test material.The results showed that compared with 15 mmol/L Ca(NO3)2(CK),80 mmol/L Ca(NO3)2 treatment significantly in-hibited the growth of B.campestris L.,while compared with 80 mmol/L Ca(NO3)2 treatment,80 mmol/L Ca(NO3)2+100 μmol/L fulvic acid treatment could sig-nificantly alleviate the inhibitory effect of Ca(NO3)2 on B.campestris L.,promote the growth of B.campestris L.seedlings,and increase the net photosynthetic rate and stomatal con-ductance.At the same time,compared with 80 mmol/L Ca(NO3)2 treatment,80 mmol/L Ca(NO3)2+100 μmol/L fulvic acid treatment could significantly reduce the relative electrical conductivity and malondialdehyde content in leaves of B.campestris L.seedlings,reduce the accumulation of O2·-and H2O2,and enhance the activities of antioxidant enzymes(su-peroxide dismutase,catalase,ascorbate peroxidase).The results indicated that exogenous application of fulvic acid could alleviate Ca(NO3)2 stress by improving photosynthetic and antioxidant ability of B.campestris L..The results of the study can provide a theoretical basis for the application of fulvic acid in relieving salt stress of vegetables.
Brassica campestris L.ssp.chinensis var.utilis Tsen et Lee.fulvic acidCa(NO3)2 stressphotosyn-thetic characteristicsantioxidant
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