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Bulletin of Botanical Research ›› 2006, Vol. 26 ›› Issue (1): 117-122.doi: 10.7525/j.issn.1673-5102.2006.01.024

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Effects on initial growth of Lolium perenne under heavy metal progressive stress

DUO Li-An;GAO Yu-Bao;ZHAO Shu-Lan   

  1. 1.College of Life Sciences, Nankai University, Tianjin 300071 2.College of Chemistry and Life Sciences, Tianjin Normal University, Tianjin 300074
  • Received:1900-01-01 Revised:1900-01-01 Online:2006-01-20 Published:2006-01-20
  • Contact: DUO Li-An
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Abstract: The experiment was conducted to investigate effects on initial growth of Lolium perenne L.under Cu2+, Zn2+, Cd2+ and Pb2+ stress. The results showed that four heavy metals didn’t inhibit seed germination significantly, especially Cu2+ and Zn2+ stress. At high concentrations, Cu2+ and Cd2+ stress decreased plant height, root length and aboveground biomass greatly, especially Cu2+ which inhibited root growth mostly. Compared with control, root length decreased by 85.48% at Cu2+ level of 300 mg·L-1. High level of Cd2+ decreased chlorophyll content significantly. Compared with control, chlorophyll content decreased by 45.51% at Cd2+ level of 300 mg·L-1. Chlorophyll contents increased at all stress levels of Cu2+ and Zn2+.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.

Key words: heavy metal, progressive stress, Lolium perenne L., initial growth

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