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| Effects of Cadmium Stress on Uptake and Distribution of Cadmium in Different Rice Varieties |
| Received:June 30, 2014 |
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| KeyWord:rice;Cd pollution-safe plant;uptake;translocation;subcellular distribution |
| Author Name | Affiliation | E-mail | | ZHANG Lu | College of Resource and Environmental Science, Sichuan Agricultural University, Chengdu 611130, China | | | ZHANG Xi-zhou | College of Resource and Environmental Science, Sichuan Agricultural University, Chengdu 611130, China | zhangxzhou@163.com | | LI Ting-xuan | 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 | | | JI Lin | College of Urban and Rural Construction, Sichuan Agricultural University, Dujiangyan 611830, China | |
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| Abstract: |
| It is important to minimize the influx of cadmium(Cd) to the human food chain. Here the characteristics of uptake and distribution of Cd in a pollution-safe rice variety were studied in a pot experiment to provide Cd safety rice germplasm resources. Cadmium pollution-safe rice variety was D62B, and common variety Luhui17 as the control. Cadmium concentrations used were 1 mg·kg-1, 4 mg·kg-1, and 16 mg·kg-1. Compared with Luhui 17, D62B growth was inhibited to some extent at all Cd levels. The biomass of D62B significantly decreased with increasing Cd concentrations. The Cd concentrations in shoot and translation coefficient of D62B were significantly lower than those of Luhui17 during the growth periods. At mature stage, the Cd concentrations in brown rice and chaff were also significantly lower than those of Luhui17. At 1 mg Cd·kg-1 and 4 mg Cd ·kg-1, the Cd concentrations in brown rice of D62B were lower than the National Food Safety Standards(0.2 mg·kg-1). The rates of Cd uptake by D62B were the greatest at tillering stage, and increased as Cd concentrations increased. The Cd translocation rate of D62B was significantly lower than that of Luhui17 at 4 mg·kg-1 and 16 mg·kg-1. At mature stage, the Cd translocation of D62B was only 46.52% and 66.68% of that of Luhui17 at 4 mg·kg-1 and 16 mg·kg-1. Cadmium absorbed by D62B accumulated about 44%～49% in cell walls and about 37% in soluble fraction, and the lowest in cellular organelles, while more than 48% of Cd in Luhui17 was localized in soluble fraction. In roots, majority of Cd was located in soluble fraction and cell walls, but percentages of Cd in cell wall was significantly lower in Luhui 17 than D62B at 16 mg·Cd kg-1. In conclusion, Cd pollution-safe rice variety D62B has low accumulation of Cd in brown rice, and could be considered as Cd safety rice germplasm resources for Cd-polluted farmlands. |
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