不同镉水平下大麦幼苗生长和镉及养分吸收的品种间差异

Differences between barley cultivars in seedling growth and in uptake of cadmium and nutrients under various Cd levels.

利用水培试验研究了不同Cd水平下大麦幼苗的Cd和几种矿质元素吸收、积累、生长和生物学产量的品种间差异 .结果表明 ,1μmol·L-1Cd处理显著降低麦苗株高、绿叶数、叶绿素计读数、地上部和根系干重 ,显著抑制植株对Zn、Mn、Cu的吸收和累积 ;品种之间存在着显著差异 ,无芒六棱受抑制最为严重 ,米麦 114和浙农 1号表现出相对较强的抗性 .麦苗Cd含量和累积量品种之间也有显著差异 ,浙农 1号的Cd含量最高 ,米麦 114最低 .相关分析表明 ,麦苗生物学产量与地上部Cd含量、累积量及根系Cd含量呈显著负相关 ,其中与地上部Cd含量的相关性最强 ,与根系Cd累积量无显著相关 .

A solution culture experiment was carried out to examine the genotypic differences of barley in the uptake/accumulation of Cd and some mineral elements,plant development and biomass accumulation under different Cd levels. The results showed that the plant height,leaf number,SPAD value and biomass accumulation of shoot/root were significantly reduced in the plant grown in 1 μmol·L -1 Cd nutrient solution compared to control,and the absorption of Zn,Mn and Cu was strictly retarded. There was a highly significant difference in the reduction of these growth parameters among cultivars. Mimai 114 and Zhenong 1 showed the least reduction,suggesting its high tolerance to Cd toxicity,while Wumaoliuling with the greatest reduction. Significant cultivar difference in Cd concentration/accumulation was also found. Zhenong 1 contained the highest Cd concentration in plant tissue,while Mimai 114 contained the lowest Cd concentration. A significantly negative correlation between biomass accumulation and Cd concentration/accumulation of shoot and Cd concentration of root was found,while no significant relationship with root Cd accumulation.