锰胁迫对锰超富集植物西南木荷矿质元素吸收的影响
Influence of Mn stress on mineral elements assimilation by Mn hyperaccumulator Schima wallichii

为评估西南木荷(Schima wallichii)的Mn富集能力,以沙培的一年生苗为材料,分别经0(CK),50和100 mmol/L Mn处理30 d,通过电感耦合等离子体发射光谱仪测定了西南木荷根、茎、叶中Mn、Mg、Ca、Fe、Cu、K、Zn元素的含量,分析了其对Mn的富集和转运能力,以及Mn胁迫对西南木荷吸收其他矿质元素的影响。结果表明,随着Mn处理浓度的增加,西南木荷根、茎、叶中Mn含量均显著增加,100 mmol/L处理的叶片中Mn含量可高达10 946.3 mg/kg,并且对Mn的转移系数和根系耐性指数均大于1,达到了Mn超富集植物的标准。Mn处理对西南木荷叶片和茎中的Mg、Ca、Fe、Cu、K、Zn元素的含量没有显著影响；但是显著增加了西南木荷根部Fe、Cu和Zn的含量。
To evaluate Mn accumulation capability of Schima wallichii,the sand-cultured one-year old seedlings were treated with 0(CK),50 and 100 mmol/L Mn,respectively,for 30 days. Concentrations of Mn,Mg,Ca,Fe,Cu,K and Zn in roots,stems and leaves were measured with inductively coupled plasma-atomic emission spectrometry to analyze Mn accumulation and translocation capacity of S. wallichii, and the influences of Mn stress on the concentrations of other mineral elements. The results showed that Mn concentrations in roots,stems and leaves apparently increased with the increment of Mn treatment concentration. The Mn concentration in leaves under 100 mmol/L Mn treatment reached 10 946.3 mg/kg,what is more,both Mn translocation factor and the root tolerance index of S. wallichii were higher than 1,which indicated that S. wallichii is a hyperaccumulator of Mn. The Mg,Ca,Fe,Cu,K and Zn concentrations in stems and leaves were not markedly influnced by Mn treatments. However,the concentrations of Fe,Cu and Zn in roots under Mn treatments significantly increased.