硒胁迫对紫花苜蓿硒积累及矿质元素吸收的效应

为了探讨硒胁迫对紫花苜蓿硒积累及对其他矿质元素吸收的影响。以3种苜蓿阿尔冈金、大叶苜蓿、维多利亚为试材,采用土培试验方法,研究了硒胁迫对紫花苜蓿不同组织的生物量、转运系数、耐性指数、硒积累量、硒含量和矿质元素含量的影响及紫花苜蓿对硒的积累能力。结果表明:施以100μmol/L硒时,硒处理显著提高了3个品种苜蓿根、茎、叶片的硒含量、耐性指数、硒积累量和K、P、Ca、Mg元素的吸收,当硒浓度为900μmol/L时,则降低了阿尔冈金和维多利亚不同器官生物量及大叶苜蓿根的生物量积累,且降低了阿尔冈金和维多利亚不同器官及大叶苜蓿根和茎对Zn吸收积累量。不同品种间相比较,大叶苜蓿生物量、硒积累量和K、P、Mg元素吸收显著高于其他2个苜蓿,且差异显著。综合评价表明,大叶苜蓿对矿质元素和Se有较好的吸收和富集能力。

Response of Se Stress on the Accumulation ofSe and the Absorption of Mineral Elements in Alfalfa

In order to explore the effect of Se stress on the accumulation of Se and the absorption of other mineral elements in alfalfa.The effect of selenium stress on the accumulation of Se and the absorption of mineral elements in different alfalfa were investigated by pot experiments, including biomass content, translocation factor, tolerance factor,Se accumulation, Se content and mineral elements content in different tissues of Medicago sativa L..The results showed that the content of Se,tolerance factor, Se accumulation and mineral elements (K,P,Ca,Mg) were gradually increased when the Se stress increased to 100 μmol/L Se,compared with control(non-Se).After exposure to 900 μmol/L Se, Se stress markedly increased the Se accumulation in the different tissues of three alfalfas.However, Se stress markedly decreased the contents of biomass in the different tissues of Medicago sativa cv.Vitoria alfalfa and the root of Medicago sative ssp., and it was markedly decreased the absorption of Zn content.Under different levels of Se stress, Se accumulation and mineral elements(K,P,Mg),compared with other species.Thus, it was concluded that Medicago sativa ssp.had high selenium resistance.