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24-Epibrassinolide alleviates the toxic effects of NaCl on photosynthetic processes in potato plants.
- Source :
-
Photosynthesis research [Photosynth Res] 2020 Dec; Vol. 146 (1-3), pp. 151-163. Date of Electronic Publication: 2020 Jan 14. - Publication Year :
- 2020
-
Abstract
- Brassinosteroids are promising agents for alleviating the negative effects of salinity on plants, but the mechanism of their protective action is far from being understood. We investigated the effect of pretreatment with 24-epibrassinolide (24-EBL) on the photosynthetic and physiological parameters of potato plants under progressive salinity stress caused by root application of 100 mM NaCl. Salinity clearly inhibited primary photosynthetic processes in potato plants by reducing the contents of photosynthetic pigments, photosynthetic electron transport and photosystem II (PSII) maximal and effective quantum yields. These negative effects of salinity on primary photosynthetic processes were mainly due to toxic ionic effects on the plant's ability to oxidize the plastoquinone pool. Pretreatment with 24-EBL alleviated this stress effect and allowed the maintenance of plastoquinone pool oxidation and the efficiency of photosystem II photochemistry to be at the same levels as those in unstressed plants; however, the pretreatment did not affect the photosynthetic pigment content. 24-EBL pretreatment clearly alleviated the decrease in leaf osmotic potential under salinity stress. The stress-induced increases in lipid peroxidation and proline contents were not changed under brassinosteroid pretreatment. However, 24-EBL pretreatment increased the peroxidase activity and improved the K <superscript>+</superscript> /Na <superscript>+</superscript> ratio in potato leaves, which were likely responsible for the protective 24-EBL action under salt stress.
- Subjects :
- Antioxidants metabolism
Electron Transport
Lipid Peroxidation
Photosystem II Protein Complex metabolism
Plant Leaves physiology
Salinity
Salt Stress
Sodium Chloride metabolism
Brassinosteroids pharmacology
Photosynthesis physiology
Solanum tuberosum physiology
Steroids, Heterocyclic pharmacology
Subjects
Details
- Language :
- English
- ISSN :
- 1573-5079
- Volume :
- 146
- Issue :
- 1-3
- Database :
- MEDLINE
- Journal :
- Photosynthesis research
- Publication Type :
- Academic Journal
- Accession number :
- 31939071
- Full Text :
- https://doi.org/10.1007/s11120-020-00708-z