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

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 .

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

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 mumol.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.