关键词: Cd, 耐受性, 富集特征, 龙须草

Abstract: A pot experiment was conducted to study the cadmium (Cd) tolerance and enrichment characteristics of Eulaliopsis binata. Applying low concentration Cd (5 mg·kg^-1) could boost the growth and physiological vigor of E. binata, with the twelve indexes such as biomass and net photosynthetic rate, etc.
increased by 1.0%-15.5%, compared with CK; while applying high concentration Cd (>5 mg·kg^-1) had negative effects on the growth of E. binata. Even
though the E. binata still finished its physiological circle under the application of 100 mg Cd·kg^-1, the biomass and net photosynthetic rate were decreased by 27.0% and 25.6%, respectively, in comparison with CK. The Cd conten t in the organs of E. binata increased greatly with increasing concentration of applied Cd. The Cd content in roots was from 350 mg·kg^-1 to 500 mg·kg^-1, and that in stems and leaves was from 15 mg·kg^-1 to 35 mg·kg^-1. When the concentration of applied Cd was <50 mg·kg^-1, the Cd uptake by E. binata increased with increasing concentration of applied Cd. The Cd content in stems and leaves amounted 15.7%-38.4% of the total uptake, and the ratio of the Cd content in stems and leaves to that in roots was up to 0.62. All the results indicated that E. binata had stronger capability in tolerating, enriching, and transporting Cd, being a potential Cd hyperaccumulator.

Key words: cadmium, tolerance, enrichment characteristics, Eulaliopsis binata