Structural, physiological, and biochemical profiling of tea plantlets under zinc stress
2013
Mukhopadhyay, M., North Bengal Agriculture Univ., Cooch Behar (India). Biotechnology Laboratory | Das, A., North Bengal Agriculture Univ., Cooch Behar (India). Biotechnology Laboratory | Bantawa, P., North Bengal Agriculture Univ., Cooch Behar (India). Biotechnology Laboratory | Sarkar, B., North Bengal Agriculture Univ., Darjeeling (India). Dept. of Chemistry | Ghosh, P., University of Kalyani, Nadia (India). Dept. of Botany | Mondal, T.K., North Bengal Agriculture Univ., Cooch Behar (India). Biotechnology Laboratory
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) plants, we treated young plants with ZnSO4 at 0 (deficiency), 0.3, 3 (optimum), and 30 microM (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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