Abstract: Effect of Cd on yield, quality. physiological and biochendcal characteristics of mulberry leaves and its distribution in subcellular fractions under different Cd levels in soil are studied in this paper. The results show that yield and contents of soluble sugar and N-containing compounds in leaves are higher than control or similar to control, and chlorophyll content, cell membrane permeability and activities of SOD, POD and Protease in mulberry leaf show little changal comparing with control, or even have certain promotive effect under lower Cd concentration of soil (<22.3mg·kg^-1). When Cd concentration in soil is higher than 22.3mg·kg^-1, yield,nutrient contents, physiological and biochewhcal properties of mulberry leaves show distinct changes, and the injury blame heavier with the increase of Cd concentration in soil. The mechanism is analyzed by distribution of Cd in subcellular fractions of mulbo leaves.Therefore mulberry can be regarded as a kind of Cd-tolerant cash crop and it is possible to grow mulberry in Cd pouuted soils.

Key words: Cd, Mulberry leaf, Quality, Physiological and biochemical characteristics, Cd tolerant, petroleum pollutants, purification ability, simulation, wetland, optimization