%0 Journal Article %A DUO Li-An %A GAO Yu-Bao %A ZHAO Shu-Lan %T Effects on initial growth of Lolium perenne under heavy metal progressive stress %D 2006 %R 10.7525/j.issn.1673-5102.2006.01.024 %J Bulletin of Botanical Research %P 117-122 %V 26 %N 1 %X 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. %U https://bbr.nefu.edu.cn/EN/10.7525/j.issn.1673-5102.2006.01.024