摘要
通过研究Cu2+、Zn2+、Cd2+与Pb2+胁迫对黑麦草初期生长的影响,结果表明:4种重金属对种子发芽率抑制效应相对较小,尤其Cu2+与Zn2+的抑制作用最小。高浓度Cu2+、Cd2+胁迫对株高、根系长度、地上生物量的抑制作用相对较大,尤其Cu2+对根系生长的抑制效应最大,在300mg.L-1下,与对照相比,根长最高下降了85.48%。高浓度Cd2+胁迫显著降低了叶绿素含量,在300 mg.L-1时比对照降低了45.51%;与对照相比,Cu2+与Zn2+所有处理都增加了叶绿素含量。从递进胁迫进程看,一些重金属对某一生长指标的影响往往表现在低浓度具有促进作用,而高浓度又存在明显的抑制效应。
The experiment was conducted to investigate effects on initial growth of Lolium perenne L. under Cu^2＋ , Zn^2＋, Cd^2＋ and Pb^2＋ stress. The results showed that four heavy metals didn＇ t inhibit seed germination significantly, especially Cu^2＋ and Zn2^2＋ stress. At high concentrations, Cu^2＋ and Cd^2＋ stress decreased plant height, root length and aboveground biomass greatly, especially Cu^2＋ which inhibited root growth mostly. Compared with control, root length decreased by 85.48% at Cu^2＋ level of 300 mg ·L^-1. High level of Cd^2＋ decreased chlorophyll content significantly. Compared with control, chlorophyll content decreased by 45.51% at Cd^2＋ level of 300 mg ·L^-1. Chlorophyll contents increased at all stress levels of Cu^2＋ and Zn^2＋. From the process of progreessive stress, some heavy metal had positive effect on some growth index at low concentrations, but inhibited growth at high concentrations.
出处
《植物研究》
CAS
CSCD
北大核心
2006年第1期117-122,共6页
Bulletin of Botanical Research
基金
天津市科技发展计划(重点培育项目)(043100611)
国家自然科学基金项目(59878033)
关键词
重金属
递进胁迫
黑麦草
初期生长
heavy metal
progressive stress
Lolium perenne L.
initial growth
