镉胁迫对文山川芎矿质营养吸收和分配的影响

Effect of cadmium stress on absorption and distribution of mineral nutrients in Ligusticum sinense sp.

关键词:  文山川芎  镉处理  矿质元素

Key words:  Ligusticum sinense sp.  cadmium treatment  mineral nutrient

摘要:

[目的] 通过水培实验，研究不同浓度镉（Cd）处理下，文山川芎不同器官的镉吸收、分配特性及对其他12种矿质元素含量的影响，以为其安全利用提供科学依据。[方法] 以文山川芎为实验材料，采用电感耦合等离子体发射光谱仪（ICP-MS），测定0、50、100 μmol/L氯化镉（CdCl₂）处理下，须根、根茎、地上茎及叶片中Cd及铁（Fe）、锌（Zn）、锰（Mn）、铜（Cu）、硼（B）、钼（Mo）、镁（Mg）、钙（Ca）、硫（S）、钾（K）、磷（P）、钠（Na）含量。[结果] 镉胁迫下，文山川芎各部分Cd的积累表现为须根>根茎>地上茎>叶。镉处理可显著影响文山川芎各器官中无机元素含量，与对照相比，须根中元素含量发生显著改变的有9种，根茎中8种，地上茎中7种，叶中8种。[结论] 文山川芎药用、食用部位均有较强的镉积累能力，镉处理可显著破坏4种器官中无机元素间的平衡，影响其药用及食用质量。

Abstract:

[Objective] Effects of different concentrations of cadmium stress on absorption and distribution of Cd and other 12 kinds of mineral nutrients in different organs of Ligusticum sinense sp. were studied by hydroponic experiments. The results would provide scientific basis for its safe utilization.[Methods] The contents of Cd,Fe,Zn,Mn,Cu,B,Mo,Mg,Ca,S,K,P and Na in fibrous roots,rhizomes,shoots and leaves of Ligusticum sinense sp.treated with 0,50,100 μmol/L CdCl₂ were determined by ICP-MS.[Results] Under cadmium stress,the accumulation of Cd in different parts of Ligusticum sinense sp. was as follows:fibrous root > rhizome > shoot > leaf. Cadmium treatment can significantly affect the concentrations of inorganic elements in the organs of Ligusticum sinense sp.. As compared with controls,9,8,7,8 kinds of elements significantly changed in fibrous roots,rhizome,shoots,leaves,respectively.[Conclusion] There was a strong accumulation ability of cadmium in the medicinal and edible parts of Ligusticum sinense sp.. Under cadmium treatment,the balance of inorganic elements in 4 organs was significantly destroyed,which would affect its medicinal and edible quality.