Growth response, accumulation and transfer characteristics of ramie(Boehmeria nivea) under cadmium stress
MENG Gui-yuan1, JIANG Duan-sheng1, BAI Lian-yang1, LIU Jie2, WU La-mei1, ZHOU Jing1
1. Hunan Institute of Humanities, Science and Technology, Loudi 417000, China; 2. Soil and Fertilizer Research Institute, Hunan Academy of Agricultural Sciences, Changsha 410125, China
In this study,a pot experiment was conducted to observe the growth responses of ramie(Boehmeria nivea ) and its tolerance,accumulation and transfer characteristics under cadmium(Cd) stress.Cd of low concentration(≤100mg·kg-1) promoted the growth of ramie by increasing its plant height,stem diameter,number of effective tillers and biomass,and the most obvious effect was found under Cd concentration of 50mg·kg-1.The growth was restricted significantly with the increasing of Cd concentrations.It could grow under 500mg·kg-1 Cd,indicating it has a strong tolerance to heavy metal Cd stress.The Cd content in both root and shoot of ramie increased with the raising of Cd concentrations,with the highest Cd content in 221.95 and 390.61mg·kg-1respectively under 500mg·kg-1Cd.The Cd factors of bioaccumulation and transfer were 0.96-2.44 and 0.57-0.94.Therefore,ramie is not a Cd hyperaccumulator,but a Cd enrichment plant.Since ramie has a well-developed root system,solid soil water retention capability and large shoot biomass,etc.,it is a desirable plant that can be used for heavy metal Cd-contaminated soil remediation.
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