【摘要】 采用盆栽试验研究比较2个黑麦草品种在不同Cd污染水平(0、75、150、300、600 mg/kg)下生长量、抗氧化酶活性、Cd含量及积累量的差异,以筛选出更适合作为土壤镉污染修复的品种。结果表明:随着土壤镉水平的增加,2个黑麦草品种根系干重、‘阿伯德’地上部干重和植株总干重呈先增加后降低的趋势。土壤镉污染水平为75 mg/kg时‘,阿伯德’地上部和植株总干重达到最大值(10.92 g/盆和12.03 g/盆),较对照分别增加了11.13%和10.67%。2个黑麦草品种各部位SOD活性、CAT活性和根系POD活性,均随土壤镉水平的增加呈先升高后降低的趋势,地上部MDA含量则逐渐升高。2个黑麦草品种镉转运系数、镉富集系数均大于1。黑麦草对Cd耐性和吸收富集存在基因型差异。比较2个黑麦草品种,在75～600 mg/kg Cd胁迫下,‘阿伯德’品种地上部干重和总干重均高于‘邦德’品种,且‘阿伯德’地上部和根系镉含量及镉积累量高于‘邦德’‘。阿伯德’更适合作为土壤镉污染的植物修复材料。更多还原

【Abstract】 Pot experiments were conducted to compare the difference of biomass, activity of antioxidant enzymes, Cd concentration and accumulation of two ryegrass varieties under different Cd levels(0, 75, 150, 300 and 600 mg/kg), to select suitable variety for soil cadmium pollution remediation. The results showed that the dry weight of roots of the two ryegrass varieties, the dry weight of the overground part and total plant dry weight of‘Abode’increased first and then decreased with the increase of Cd level. The dry weight of the overground part and total plant dry weight of‘Abode’reached the maximum value of 10.92 g/pot and 12.03 g/pot under 75 mg/kg Cd, increased by 11.13% and 10.67% respectively compared with those of the control. The activities of SOD and CAT in shoots and roots, and the activities of POD in roots of the two ryegrass varieties increased first and then decreased with the increase of Cd level. The content of MDA in shoots increased with the increase of Cd level. The Cd transport coefficient and Cd enrichment coefficient of the two ryegrass varieties were higher than 1. There were genotypic differences in Cd tolerance, absorption and accumulation of different ryegrass varieties. The dry weight of shoots and plants of‘Abode’were higher than that of‘Bond’, and the content and accumulation of Cd in shoots and roots of‘Abode’were higher than that of‘Bond’under 75-600 mg/kg Cd stress. Therefore,‘Abode’is more suitable as a phytoremediation material for soil cadmium pollution.更多还原