摘要：I. lactea var. chinensis is tolerant to and accumulates cadmium (Cd), lead (Pb) and salt. The purpose of the study was to disclose the chromium(VI) impact on I. lacteavar. chinensis, and it was treated with 25 and 100 μmol Cr(VI) for 4 and 8 days, respectively. The dry weight and relative water content of shoots decreased gradually as chromium concentration increased. However, superoxide dismutase (SOD) activity, malondialdehyde (MDA) content, and proline content increased whereas there was a progressive drop in chlorophyll content in both chromium treatments under both concentrations. Using electron microscopy, we observed that chloroplast shape, starch grain number and grana arrangement were all changed by chromium. Our findings provided new insights into the mechanism of chromium tolerance in Iris plants.
关键词：I. lactea var. chinensis; chromium; heavy metal; antioxidase; ultrastructure
