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草业科学  2014 

不同基因型高羊茅的耐铅与铅富集特性

DOI: 10.11829\j.issn.1001-0629.2014-0065, PP. 1269-1274

Keywords: 高羊茅,重金属铅,植物修复,铅富集,筛选

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Abstract:

?高羊茅(Festucaarundinacea)具有修复铅(Pb)污染土壤的应用潜力。为筛选耐铅和铅富集能力强的高羊茅基因型,本研究利用水培试验,分析了铅浓度在500、1000、1500mg·L-1递增的条件下,18个高羊茅基因型的生长反应和铅吸收转运特征。结果表明,500mg·L-1铅浓度下,所有基因型均保持良好的生长状况及草坪质量;当浓度升至1000、1500mg·L-1时,草坪质量、植株铅含量以及铅转移系数均出现显著的基因型间差异(P<0.05)。‘Kentucky-31’,‘PI232876’,‘PI634229’和‘AST7001’等基因型的地上部铅含量大于35mg·g-1DW(干质量),同时,它们对铅的转移系数也较高(大于0.42)。而‘Silverado’的地上部铅含量(3.34mg·g-1DW)和铅转移系数(0.03)均最小,对铅的耐性最强。研究结果为铅污染土壤的植物修复与植被重建提供了新的材料和参考。

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