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| Cadmium Accumulation in High Cadmium-Accumulating Rice Cultivars at Different Growth Stages |
| Received:September 29, 2014 |
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| KeyWord:rice;growth period;Cd;high accumulation |
| Author Name | Affiliation | E-mail | | TANG Hao | College of Resource and Environmental Science, Sichuan Agricultural University, Chengdu 611130, China | | | LI Ting-xuan | College of Resource and Environmental Science, Sichuan Agricultural University, Chengdu 611130, China | litinx@263.net | | ZHANG Xi-zhou | College of Resource and Environmental Science, Sichuan Agricultural University, Chengdu 611130, China | | | YU Hai-ying | College of Resource and Environmental Science, Sichuan Agricultural University, Chengdu 611130, China | | | CHEN Guang-deng | College of Resource and Environmental Science, Sichuan Agricultural University, Chengdu 611130, China | |
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| Abstract: |
| With the development of agriculture and industry, a large number of pollutants containing cadmium(Cd) have entered the soils. High contents of Cd in soil usually affect plant growth and elevate plant Cd contents, thus causing harm to human health through food chain. Therefore, reducing soil Cd content is critical. Here, a pot experiment was designed to evaluate the Cd accumulation characteristics of rice cultivars with high Cd accumulation at different growth stages. Two high Cd-accumulating rice cultivars(Lu527-8 and Lu17-9) screened earlier were used with common variety Lu527-4 as control. With growth period prolonged, a significant increase(P<0.05) was observed in shoot and whole plant biomass of two high Cd-accumulating rice cultivars(Lu527-8 and Lu17-9) in high Cd soil. The biomass increase was smaller at tillering-jointing stage while greater at jointing-maturity stage. With growth period prolonged, Cd absorption by both high Cd-accumulating cultivars(Lu527-8 and Lu17-9) was higher than that of the control(Lu527-4) at each growth stage(P<0.05). Cadmium accumulation rates of both high Cd-accumulating cultivars reached a maximum at the filling stage. The shoot Cd accumulation rates of rice Lu527-8 and Lu17-9 were respectively 2.43 and 2.24 times higher than that of the control(Lu527-4) at filling stage. The Cd accumulation rates of the whole plant were 2.33 and 2.10 times higher for Lu527-8 and Lu17-9 at filling stage, respectively, compared with that of control(Lu527-4). The Cd accumulation in shoot of high Cd- accumulating cultivars(Lu527-8 and Lu17-9) with high Cd treatments reached 359.28 and 331.22 μg·plant-1 at filling stage, which was respectively 2.44 and 2.25 times higher than that of the control(Lu527-4). The Cd accumulation in whole plant were 1 374.35 and 1 240.72 μg·plant-1 for Lu527-8 and Lu17-9 at filling stage, which was 2.33 and 2.10 times higher than that of the control(Lu527-4), respectively. The high Cd-accumulating cultivars accumulated significantly higher Cd at jointing-heading and heading-filling stages than other stages. During jointing-heading and heading-filling periods, Cd accumulation by rice cultivar Lu527-8 respectively accounted for 15.30% and 40.45% of the whole growth period, while 39.70% and 20.74% for rice cultivar Lu17-9. The purification rate(PR) of soil Cd by shoot and whole plant increased significantly with increasing growth period before the filling stage(P<0.05). At filling stage, the PR of shoot was 0.82% and 1.25% for Lu527-8 and Lu17-9, while 4.88% and 4.39% for the whole plants, which was 2.44 and 2.21 times that of the control(Lu527-4), respectively. The present results show that high Cd-accumulating rice cultivars have great ability to accumulate and purify Cd from soils contaminated by high Cd, and that the filling stage is the optimum time for plant harvest for the purification purpose. |
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