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作 者 ：黑淑梅　佘小平

期 刊 ：西北植物学报 2005年 3期

关键词：Cr^6＋；小麦幼苗；根系生长；DNA损伤；

Keywords:Cr~(6+), wheat seedlings, growth of root system, DNA damage,

摘 要 ：研究了Cr6+胁迫对3 d和10 d龄小麦幼苗根系生长的影响及DNA损伤效应.结果表明(1)>5 mg/L的Cr6+均显著或极显著降低幼苗根长、根数及根系鲜重、干重,3 d龄幼苗根系生长比10 d龄幼苗对Cr6+胁迫更敏感;(2)所试浓度Cr6+均降低两苗龄幼苗根系DNA含量;5～20 mg/L Cr6+浓度范围内,3 d龄幼苗根系DNA含量下降幅度大于10 d龄幼苗,Cr6+浓度>20 mg/L时,3 d龄幼苗根系DNA含量低于10 d龄幼苗;(3)Cr6+对两苗龄幼苗根系DNA增色效应的影响均呈现随浓度增大先升高后下降的趋势;3 d龄幼苗根系DNA增色效应在5～60 mg/L Cr6+浓度范围内大于对照,Cr6+浓度>60 mg/L时则小于对照;在所试Cr6+浓度范围内,10 d龄幼苗根系DNA增色效应均大于对照.

Abstract:The inhibition of root growth and DNA damage resulting from by different concentration of Cr~(6+) were investigated at two growth stages of wheat (Triticum aestivum cv.Xiaoyan No.22) seedlings.The results were as follows:(1) Roots length,roots number,fres

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