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Chinese Journal of Applied Ecology ›› 2005, Vol. 16 ›› Issue (10): 1983-1989.

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Biological effects of rare earth elements and their action mechanisms

HE Yuejun1, XUE Li1,2   

  1. 1. College of Forestry, South China Agricultural University, Guangzhou 510642, China;
    2. Huitong Experimental Station of Forest Ecology, Chinese Academy of Sciences, Huitong 418307, China
  • Received:2004-10-25 Revised:2005-01-06 Online:2005-10-15 Published:2005-10-15

Abstract: This paper reviewed the effects of rare earth elements on plant root development,biomass,quality,and resistance against stress.Applying appropriate amount of rare earth elements could not only promote seed germination and root development,increase plant biomass,but also improve harvest quality and plant resistance against stress.The plant uptake characteristics of rare earth elements,as well as their contents,distribution,existing forms,and cyto-localization in plants were discussed,with the focus on the effects of rare earth elements on photosynthesis and chlorophyll formation,nutrient uptake,relationships between rare earth elements and calcium,and action mechanisms of rare earth elements on cell membrane and enzymes.Rare earth elements could enhance chlorophyll content and improve photosynthetic rate,and thus,could increase plant biomass.When an appropriate amount of rare earth elements was applied,the uptake of nutrients by plant and their transformation and utilization were promoted.Rare earth elements could replace calcium ion to participate in enzymatic reactions,maintain the osmosis and stability of cell membrane,promote the protection function of cell membrane,and enhance the plant resistance capability against stress.In the end,further researches on rare earth elements were suggested.

Key words: Rare earth element, Plant, Biological effect, Mechanism

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