Abstract
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.
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Abbreviations
- APX:
-
ascorbate peroxidase
- Car:
-
carotenoids
- CAT:
-
catalase
- Chl:
-
chlorophyll
- E:
-
transpiration rate
- gs :
-
stomatal conductance
- MDA:
-
malondialdhyde
- PN :
-
net photosynthetic rate
- POD:
-
peroxidase
- SOD:
-
superoxide dismutase
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Acknowledgements: The authors are thankful to late Dr. R S Saha, Scientist, Darjeeling Tea Research Centre, Tea Board, Darjeeling, West Bengal for providing the tea plantlets. The financial assistance from Tea Board, Govt of India is also acknowledged.
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Mukhopadhyay, M., Das, A., Subba, P. et al. Structural, physiological, and biochemical profiling of tea plantlets under zinc stress. Biol Plant 57, 474–480 (2013). https://doi.org/10.1007/s10535-012-0300-2
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DOI: https://doi.org/10.1007/s10535-012-0300-2