关键词: 日本沼虾, 铅, 超微结构, 组织化学

Abstract: A pot experiment was conducted to study the distribution, accumulation, and transfer of cadmium (Cd) in spring wheat under Cd stress. With the increasing concentration of exogenous Cd, the Cd contents in spring wheat roots, stems, leaves, and seeds increased, and the Cd accumulation in different plant parts was in the order of root > leaf > stem > seed. There was a significant correlation between the Cd contents of seed and soil. Different plant parts had different capability in enriching Cd, and the enrichment coefficient was reduced gradually with increasing concentration of added Cd. When the soil Cd content was low, different plant parts enriched Cd more easily. The transfer coefficient of Cd in plant aboveground part was in the order of stem and leaf > seed. During the growth period of spring wheat, no obvious change was observed in soil Cd content, but the root and plant Cd contents peaked on days 70 and 80, respectively, followed by a gradual decrease, which suggested that the Cd in wheat plant was gradually transferred into seeds during the process of ripening.

Key words: Macrobrachium nipponense, Lead, Ultrastructure, Histochemistry