Structural, physiological, and biochemical profiling of tea plants under zinc stress
| Autor: | Pranay Bantawa, Parthadeb Ghosh, Bipasa Sarkar, Mainaak Mukhopadhyay, P. Subba, Akan Das, Tapan Kumar Mondal |
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| Rok vydání: | 2013 |
| Předmět: |
chemistry.chemical_classification
Reactive oxygen species Stomatal conductance Antioxidant biology Superoxide medicine.medical_treatment food and beverages Plant Science Horticulture Superoxide dismutase chemistry.chemical_compound chemistry Biochemistry Catalase Shoot biology.protein medicine Food science Peroxidase |
| Zdroj: | Biologia plantarum. 57:474-480 |
| ISSN: | 1573-8264 0006-3134 |
| Popis: | Zinc is the most widespread deficient micronutrient in the tea growing soils of India which affects growth of the plants. In order to investigate the structural, physiological, and biochemical changes under Zn stress (i.e. both deficient and excess supply) of tea [Camellia sinensis (L.) O. Kuntze cv. T-78] plants, we treated young plants with ZnSO4 at 0 (deficiency), 0.3, 3 (optimum), and 30 μM (toxic) concentrations for 8 weeks. Zn deficiency and excess resulted in considerable decrease in shoot and root fresh and dry masses, and transmission electron microscopy (TEM) revealed disorganization of some cellular organelles. Further, Zn-stress decreased net photosynthetic rate (PN), transpiration rate (E), stomatal conductance (gs), and content of chlorophylls a and b. On the other hand, content of superoxide anion, malondialdehyde, hydrogen peroxide, and phenols, and electrolyte leakage were elevated in stressed plants. The activities of ascorbate peroxidase, catalase, superoxide dismutase, and peroxidase as well as expression of respective genes were up-regulated under Zn-stress. Nevertheless, antioxidant system as a whole did not afford sufficient protection against oxidative damage. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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