稀土镧对镉胁迫下玉米幼苗生长的影响

Effect of La on corn seedling growth under Cd stress

摘要: 以水培法研究了重金属Cd对玉米幼苗的胁迫伤害及稀土La对Cd伤害的缓解作用。结果表明，在Cd胁迫伤害下，玉米幼苗生长受到抑制，主要表现为株高、主根长下降，叶面积锐减，茎叶、根的鲜重以及干重明显下降，随着Cd胁迫浓度的增加，玉米幼苗受伤害程度趋向严重。在玉米幼苗上喷施适量浓度LaCl₃(20mg/L)，能缓解Cd对玉米幼苗生长造成的伤害。

Abstract: Hydroponic culture experiment was conducted to study the effect of La on corn seedling growth under Cd stress. The results show inhibition of corn seedling growth by Cd stress.The height, root length,leaf area,shoot and root fresh weight and dry weight decrease remarkably under Cd stress. With increased Cd²⁺ concentration, damage to corn plant becomes serious. Application of 20mg/L La during the growing stage of corn seedling markedly alleviates Cd stress damage.