PJB-2019-614
Physiological and Antioxidant Responses of Brassica napus to Salt Stress
Yan-Hua Yang
Abstract
Brassica napus L. is one of the most important oil crops and salt stress severely affects its growth and productivity. Here, a rapeseed mutant with salt tolerance was found from ZhongShuang 11 (wild type). In order to explore the effect of salt stress on the mutant and wild type, the germination rate, dry/fresh weights, root/stem lengths, and the contents of chlorophyll, soluble protein and malondialdehyde (MDA) were investigated. Meanwhile, the activities of SOD, CAT, GR, and GPx were also studied. Compared with the wild type, salt stress had little influence on the growth of the mutant. In the non-salined control plants, there were no differences in the antioxidant enzymes activities for the mutant and wild type. Adding 200 Mm NaCl to the nutrient solution enhanced the level of antioxidants of both the mutant and wild type, and the change of SOD, CAT, GR, and GPx activities showed a similar trend in the mutant and wild type. These results suggest that efficient antioxidant defense plays an important role in resistance to salt stress. Moreover, the measurement of chlorophyll and soluble protein revealed a considerable increase in the mutant but the MDA content showed a significant decrease, indicating that the changes of chlorophyll, soluble protein and MDA contents are beneficial for plants to adapt to high salt environment. Taken together, our findings not only deciphered the salt-tolerant characteristics of the mutant, but also provided excellent material for the salt-tolerant study of rapeseed.
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