Effects of Exogenous Silicon on Photosynthesis and Chlorophyll Fluorescence Characteristics and Antioxidant Enzymes of Cryptocarya concinna Seedlings Under Salt Stress

doi:10.11924/j.issn.1000-6850.casb2022-0121

Abstract

Abstract:

In this study,one-year-old seedlings of Cryptocarya concinna were treated with different concentrations (0, 0.5, 1 and 2 mmol/L) of exogenous silicon under salt stress at 100 mg/L NaCl. The chlorophyll content, photosynthesis and chlorophyll fluorescence characteristics and antioxidant enzymes were determined and analyzed for investigating the effects of exogenous silicon on C. concinna exposed to NaCl stress. The results indicated that exogenous silicon could increase the contents of chlorophyll a, chlorophyll b and carotenoid, the activities of SOD, PPO and APX, and the values of Pn, Tr, Gs and Fv/Fm, while reduce the MDA content and Ci value. By comparing different treatments, PPO content was the highest under the treatment of adding 1.0 mmol/L Si and other indexes were the highest under the treatment of adding 2.0 mmol/L Si. In conclusion, the addition of appropriate concentration of exogenous silicon can alleviate the damage of salt stress to C. concinna seedlings and improve seedling salt tolerance. This study will provide reference for the introduction and cultivation of C. concinna.

Key words: exogenous silicon, salt stress, Cryptocarya concinna, photosynthesis and chlorophyll fluorescence characteristics, antioxidant enzymes

CLC Number:

HUANG Pingsheng, LIU Shinan, LI Ting, QIN Yonghua. Effects of Exogenous Silicon on Photosynthesis and Chlorophyll Fluorescence Characteristics and Antioxidant Enzymes of Cryptocarya concinna Seedlings Under Salt Stress[J]. Chinese Agricultural Science Bulletin, 2022, 38(23): 32-38.

Figures/Tables 4

References 42

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