Zinc in plants - an overview.

Owing to continuous development of knowledge at a biophysics, biochemistry, molecular biology and geneticslevels, essential progresses to understand the mechanisms underlying the threshold of Zn toxicity has beenachieved. Following this background, Zn uptake and translocation and its functions in plants are described,being its toxic effect on growth, photosynthetic activity and oxidative stress discussed. The extent of plantinjury by elevated Zn concentrations is also assessed, considering its specific and strong dependence on theenvironmental conditions and availability of other heavy metals.