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| The Responses of Plants to High Concentrations of Strontium, Cesium Stress and the Screening of Remediation Plants |
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| KeyWord:strontium stress；cesium stress；plant responses；remediation plants；screening |
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| Abstract: |
| Studies of the resistance and accumulation ability of different plant species to strontium（Sr） and cesium（Cs） has important theoretical and practical significance for the bioremediation of Sr and Cs contaminated soil. The resistance and enrichment ability of high concentrations of Sr（500 mg Sr·kg-1） or Cs（500 mg Cs·kg-1） in thirteen plant species were investigated and evaluated in this study, in order to screen remediation plants for governance soil Sr or Cs contamination. The results showed that：（1）The sesame（Sesamum indicum） was strongest resistance to high concentration Sr stress, followed by sunflower（Helianthus annuus）, red circle leaves amaranthus（Iresine herbstii‘Aureo-reticulata’）, Chicory（Cichorium intybus）, Hollow lotus seed grass（Alternanthera philoxeroides）, summer squash（Cucurbita pepo）, water spinach（Ipomoea aquatica）, okra（Hibiscus esculentus）, Sorghum（Sorghum bicolor）, malabar spinach [Gynura cusimbua（D. Don）S. Moore], willow amaranth（Amaranthus mangostanus）, Snap bean（Phaseolus vulgaris）, pigweeds（Chenopodium album）; （2）The sesame was also strongest resistance to high concentration Cs stress, followed by water spinach, snap bean, hollow lotus seed grass, summer squash, okra, sunflower, willow amaranth, red circle leaves amaranthus, pigweeds, malabar spinach, Sorghum, Chicory;（3）summer squash had the biggest of Sr accumulation amount, transfer factor（TF value）, the Sr accumulation of unit acreage and the aboveground organs in the thirteen plant species; （4）Chicory had the biggest Cs accumulation amount and TF value, and pigweeds had the biggest Cs accumulation of unit acreage and the aboveground organs, followed by hollow lotus seed grass. Based on the resistance and accumulation capacity of these plants to Sr and Cs , summer squash, Chicory，malabar spinach and okra can be used to repair the high concentration Sr contaminated soil, and pigweeds, Hollow lotus seed grass, and sunflower can be used to repair of the high concentration Cs contaminated soil. |
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