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| Cadmium accumulation in above-ground parts of lettuce(Lactuca sativa L.) and its relationship between mineral nutrients concentration |
| Received:October 06, 2017 |
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| KeyWord:greenhouse;Cd pollution;lettuce;Cd uptake characteristic;mineral nutrients |
| Author Name | Affiliation | E-mail | | TANG Xi-wang | Department of Environmental Science, Heibei University of Environmental Engineering, Qinhuangdao 066102, China
College of Resources and Environment, Northwest A & F University, Yangling 712100, China | | | JI Pu-hui | College of Resources and Environment, Northwest A & F University, Yangling 712100, China | | | TONG Yan-an | College of Resources and Environment, Northwest A & F University, Yangling 712100, China | tongyanan@nwsuaf.edu.cn | | YI Li-li | Department of Environmental Science, Heibei University of Environmental Engineering, Qinhuangdao 066102, China | |
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| Abstract: |
| To explore the characteristic of Cd concentrations and accumulation in above-ground parts of lettuce and its interactions with mineral nutrients uptake, a field study was conducted in a Cd-contaminated greenhouse. Lettuce named "Lisheng, erhao" was cultivated and the above-ground parts were sampled during the whole growth stage and the Cd and Fe, Mn, Cu, Zn, Ca, Mg content in lettuce aboveground parts were measured. The results showed that the Cd concentration in the above-ground parts of lettuce increased from 2.70 to 3.62 mg·kg-1 during the seedling stage, but decreased from 3.62 to 2.40 mg·kg-1 during organogenesis and from 2.40 to 1.64 mg·kg-1 during bolting. The Cd accumulation in the above-ground parts of an individual lettuce plant could be described by a sigmoidal curve(R2=0.99). The Cd accumulate rate for seedling stage, organogenesis and bolting were 0.098, 0.516, 0.056 μg·plant-1·d-1. During the whole stage, the r value of Cd with Fe, Mn, Cu, Zn, Ca, Mg were -0.77, -0.31, -0.06, 0.09, 0.46, -0.10 respectively. During the vegetative stage(seedling+ organogenesis stage) the r value of Cd with Fe, Mn, Cu, Zn, Ca, Mg were -0.43, 0.25, -0.06, 0.16, 0.56, 0.41 respectively. During reproductive stage, the r value of Cd with Fe, Mn, Cu, Zn, Ca, Mg were -0.82, -0.26, 0.72, 0.93, 0.42, 0. The conclusion were:The Cd content in lettuce aboveground parts was highly related to growth, the Cd content was increasing during seedling while decreasing during organogenesis and bolting. Cadmium uptake during seedling was 15%, during organogenesis was 80%, during bolting was 4.35%. During the whole stage, the concentration of Cd content in lettuce was negative related to the concentration of Fe(r=-0.77, P<0.01), significantly positive with the concentration of Ca(r=0.46, P<0.05). During vegetative stage, Cd concentration in lettuce was significant positive related to Ca(r=0.56, P>0.05). During reproductive stage, Cd concentration showed significant negative to Fe concentration(r=-0.82, P<0.05) while it was significant positive with Zn concentration(r=0.93, P<0.01). |
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