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Acta Prataculturae Sinica ›› 2014, Vol. 23 ›› Issue (6): 176-188.DOI: 10.11686/cyxb20140622

• Orginal Article • Previous Articles     Next Articles

Cadmium tolerance and accumulation in four cool-season turfgrasses

XU Pei-xian,FEI Ling,CHEN Xu-bing,WANG Zhao-long   

  1. School of Agriculture and Biology, Shanghai Jiaotong University, Shanghai 200240, China
  • Received:2013-12-02 Online:2014-12-20 Published:2014-12-20

Abstract: Tall fescue, Kentucky bluegrass, perennial ryegrass and creeping bentgrass are hyper-tolerant grasses to soil cadmium (Cd) contamination. However, little information is available on their physiological responses and accumulation capability for Cd. These four cool-season turfgrasses were exposed to Cd at different levels (50, 100, 200, 400 mg Cd/kg) for 60 d. The effect of Cd stress on the physiological responses and Cd concentrations in the shoots and roots were investigated. Tall fescue was most tolerant to Cd stress, followed by perennial ryegrass, Kentucky bluegrass and creeping bentgrass. Leaf relative growth rate and root biomass were more sensitive than other parameters. The concentration and accumulation of Cd in both shoots and roots increased with Cd dose. At the same level of Cd treatment, the highest shoot concentration of Cd was found in Kentucky bluegrass, followed by tall fescue and creeping bentgrass, while the lowest shoot concentration of Cd was found in perennial ryegrass. The highest root concentration of Cd was in perennial ryegrass. Under 50-400 mg Cd/kg treatments, Kentucky bluegrass had the highest translocation factor and phytoextraction rate, whereas perennial ryegrass had the lowest translocation factor and phytoextraction rate. In summary, under the same level of Cd treatment, accumulation of Cd in shoots of Kentucky bluegrass was higher than for the other three species, while the accumulation of Cd in the root of creeping bentgrass was lowest among the four grass species and this may be linked to its low root biomass. Our study provides data on Cd tolerance and accumulation capability of the four grass species, and indicates their potential for phytostabilizing Cd contaminated soils.

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