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Acta Prataculturae Sinica ›› 2014, Vol. 23 ›› Issue (3): 333-342.DOI: 10.11686/cyxb20140339

• Orginal Article • Previous Articles     Next Articles

Impacts of heavy metals on the fluorescence characteristics and root morphology of 2 turfgrass species

CHEN Wei1,2,ZHANG Miao-miao3,SONG Yang-yang1,CHEN Jian-gang1,ZHANG De-gang1   

  1. 1. College of Pratacultural Science, Gansu Agricultural University, Key Laboratory of Grassland Ecosystem,Ministry of Education,Sino-U. S. Centers for Grazingland Ecosystem Sustainability, Lanzhou 730070,China;
    2. Lanzhou City University, Lanzhou 730070, China;
    3. College of Forestry,Gansu Agricultural University, Lanzhou 730070, China
  • Received:2013-09-06 Online:2014-06-20 Published:2014-06-20

Abstract: The impacts of Cu2+, Zn2+, Pb2+ and Cd2+ stresses on fluorescence characteristics and root morphology of tall fescue (Festuca elata) and perennial ryegrass (Poa pratensis) were studied. The Fv/Fm of tall fescue under Cu2+, Zn2+, Pb2+ and Cd2+ stresses were lower than that in the controls suggesting that the activity of PSⅡ was weakened. However, it was quite different for perennial ryegrass. The Fv/Fm under Cd2+ stress was slightly higher than that in the controls indicating that the impact of Cd2+ was not significant. However, it was significantly reduced when the concentrations of Cu2+ and Zn2+ reached 500 mg/kg or more. Meanwhile, the lower concentrations of Zn2+ resulted in an improving effect on the PSⅡ system. The qP and ETR of both species under the stresses of 4 heavy metals were lower than those in the controls suggesting that the photosynthetic activity and electron transformation efficiency were inhibited. Except at low concentrations, the root length, root area, numbers of root forks and tips of tall fescue were significantly lower than those in the controls when under stress from four heavy metals: there was a decreasing trend with increasing stress concentration. Perennial ryegrass showed a strong resistance to the stresses when heavy metals were at low concentrations and vice versa.

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