关键词: 重金属, 胁迫, 盐生草, 萌发

Abstract: This study firstly researched germination characteristics of Halogeton glomeratus under different concentrations of heavy metals Cu²⁺,Zn²⁺,Ni²⁺,Cd²⁺ and Pb²⁺ supplemented with 100 mmol·L^-1 NaCl. The results showed that germination rate and germination potential increased at first and then decreased with the increase of the heavy metals concentrations. It indicated that the low concentration of heavy metal ions promoted the germination of plants. Fresh weight,dry weight and seedlings height decreased gradually. The results of ion contents showed that Cd²⁺ and Pb²⁺ contents increased at first and then decreased,and Cu²⁺,Zn²⁺ and Ni²⁺ contents increased with increasing heavy metals concentrations. The root activity of Cu²⁺ and Zn²⁺ increased first and then decreased,and it decreased with the increase of Ni²⁺,Cd²⁺ and Pb²⁺ concentrations. The comprehensive clustering and principal component analysis were carried out to obtain the critical concentrations of Cu²⁺,Zn²⁺,Ni²⁺,Cd²⁺ and Pb²⁺ in Halogeton glomeratus,which were 1.00 mmol·L^-1,10.00 mmol·L^-1,0.30 mmol·L^-1,0.20 mmol·L^-1 and 0.50 mmol·L^-1,respectively. The most important indexes were germination index,dry weight,germination energy,dry weight and germination energy when the stress concentration reached the critical value for Halogeton glomeratus.

Key words: Heavymetals, Stress, Halogeton glomeratus, Germination