STUDIES ON SPATIO-TEMPORAL AND PHYTOHORMONAL EXPRESSION PATTERN OF MTP2 PROTEIN AND ITS CHARACTERIZATION ACROSS DIFFERENT PLANT SPECIES
Zinc is an essential micronutrient involved in aÂ wide range of physiological processes of plantsÂ (Marschner, 1993). Even though it is required for plant
growth, the excess amount of Zn causes toxic effectsÂ to plants. It is known that during Fe deficiency, theÂ uptake of Zn is induced which leads to the accumulationÂ of the excess amount of Zn in the plant cytoplasm.Â The plant has evolved an efficient mechanism inÂ detoxifying the excess Zn uptake during Fe deficiencyÂ conditions, of which vacuoles are identified to be theÂ main storage and detoxifying organelles for Zn excessÂ in the cytoplasm (Gustin et al., 2009). Zinc is normallyÂ available to the plants in its oxidized form Zn2+ from theÂ soil through the mass flow and diffusion mechanismÂ by roots (Rattan and Deb, 1981). Availability of Zn isÂ high in low acidic pH wherein the high pH reduces itsÂ availability in soil and the root plasma membraneÂ transporters reported for major uptake of Zn from theÂ soil (Marschner, 1993).