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- W3152321822 abstract "Tomato (Lycopersicon esculentum Miller) cv. Jiahe No. 9 (a salinity-resistant cultivar) and cv. Shuangf- eng 87-5 (a salinity-sensitive cultivar) were used as experimental materials to investigate the effects of exog- enous selenium (Na2SeO3 0.05 mM) on plant growth, chlorophyll fluorescence, photosynthetic rate, and antioxi- dative metabolism of chloroplasts in tomato seedlings under NaCl (100 mM) stress. Salt stress significantly inhibited plant growth, net photosynthetic rate (Pn), max- imum quantum yield of PSII (Fv/Fm), actual photochemical efficiency of PSII (UPSII), photochemical quenching coef- ficient (qP), and non-photochemical quenching coefficient (qN) of both cultivars, whereas application of Se reversed the negative effects of salt stress. Furthermore, application of Se significantly decreased the levels of hydrogen per- oxide (H2O2) and malondialdehyde. Application of Se increased the activities of superoxidase dismutase, gluta- thione reductase, dehydroascorbate reductase, monodehy- droascorbate reductase, glutathione peroxidase, and thioredoxin reductase, and the contents of ascorbate, glu- tathione (GSH) and NADPH, and the ratios of GSH/GSSH, AsA/DHA, and NADPH/ NADP ? in the salt-stressed chloroplasts of both cultivars. These results suggest that Se alleviates salt-induced oxidative stress through regulating the antioxidant defense systems in the chloroplasts of tomato seedlings, which is associated with the improve- ment of the photochemical efficiency of PSII, thereby maintaining higher photosynthetic rates. In addition, the salt tolerance of Jiahe No. 9 is closely related with high reactive oxygen species scavenging activity and reducing power levels in the chloroplasts." @default.
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- W3152321822 date "2014-01-01" @default.
- W3152321822 modified "2023-09-27" @default.
- W3152321822 title "Selenium Promotes the Growth and Photosynthesis of Tomato Seedlings Under Salt Stress by Enhancing Chloroplast Antioxidant Defense System" @default.
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