Chinese Bulletin of Botany ›› 2013, Vol. 48 ›› Issue (4): 381-388.DOI: 10.3724/SP.J.1259.2013.00381

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Cadmium Accumulation and Subcellular Distribution in Different Organs of Artemisia selengensis

Meng Dong1,2, Yunlin Zhao1*, Wenzhen Ku1, Xiaomei Zhou1, Yanzi Li1   

  1. 1College of Chemistry and Environment Engineering, Hunan City University, Yiyang 413000, China;

    2College of Biology and Technology, Hunan Agricultural University, Changsha 410128, China
  • Received:2012-08-02 Revised:2013-01-22 Online:2013-07-01 Published:2013-08-09
  • Contact: Yunlin Zhao

Abstract: We used fractionation with cadmium (Cd) treatment to investigate the subcellular distribution of Cd in different organs of Artemisia selengensis. With 30 mg·kg─1 Cd, Cd content was 2 to 3 times higher in leaves than in stems and roots; however, because of the smaller proportion of leaf biomass to total plant biomass, the amount of Cd in leaves was much less than that in stems or roots. Under the stress of this Cd concentration, the subcellular distribution ratio of Cd in leaves was 16:5:1 for cell walls, cytosole, and organelles. The retention of Cd in the cell walls is a major defense mechanism of leaves. The Cd content in cell walls and cytosole increased significantly with increasing additional Cd2+, but Cd content in organelles was still low. The stress of long-term Cd exposure or high Cd concentration causes serious harm or even death to a plant. A large amount of Cd is deposited in root vacuoles, for a detoxification effect for Cd stress.