作者: Xiao-Zhang Yu , Ji-Dong Gu , Shen-Zhuo Huang
DOI: 10.1007/S10646-006-0129-6
关键词: Superoxide dismutase 、 Catalase 、 Chlorophyll 、 Salix matsudana 、 Hexavalent chromium 、 Shoot 、 Transpiration 、 Ascorbic acid 、 Chemistry 、 Horticulture 、 Botany
摘要: Metabolic responses to hexavalent chromium (Cr6+) stress and the uptake translocation of Cr6+, were investigated using pre-rooted hybrid willows (Salix matsudana Koidz x Salix alba L.) exposed hydroponic solution spiked with K2CrO4 at 24.0+1 degrees C for 192 h. Various physiological parameters plants monitored determine toxicity from Cr6+ exposure. At treatments 50% higher than that non-treated control plants. As Cr concentrations increased further, a slight increase in transpiration rate was also observed compared controls. Negligible difference chlorophyll contents leaves between treated measured, except 1.05 mg Cr/l. The response soluble proteins remarkable. Cr-induced appeared all resulting reduced activities catalase (CAT) peroxidase (POD) Superoxide dismutases (SOD) activity leaf cells showed positive after Of selected parameters, most sensitive doses, showing significant linear correlation negatively (R-2=0.931). Uptake by grown flasks found linearly added (a zero order kinetics), as indicated high R-2 (0.9322). Recovery different parts plant materials varied significantly roots being dominant site accumulation. Although shoots detected, amount translocated considerably small. capacity assimilate evaluated detached sealed glass vessels vivo. mediated possibly through an active transport mechanism, whereas cuticle major obstacle solution. In addition, both cysteine ascorbic acid remarkable potential reduce neutral pH. Results did not cause deleterious effects on functions over 192-h period Significant removal presence willows. data suggest phytoremediation is possible ecologically safe due minor aerial tissues.