Pedosphere 9(2): 169--176, 1999
ISSN 1002-0160/CN 32-1315/P
©1999 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Subcellular accumulation of cadmium in corn and wheat plants at different levels of phosphorus |
| YANG Zhi-Min1, ZHENG Shao-Jian2 and HU Ai-Tang1 |
1 Collage of Natural Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095 (China)
2 Department of Agro-Environmental Management, Kyushu National Agriculturul Eoperiment Station, Nishigoshi, Kumamoto 861-1192 (Japan) |
| ABSTRACT |
| Corn and wheat plants were grown in a nutrient culture solution at four levels of phosphorus (0, 0.12, 0.60 and 3.0 mmol L-1) and two levels of cadmium (0 and 4.0 μmol L-1) in greenhouse for a 18-day period. The concentrations of phosphorus and cadmium in cell wall, cytoplasm and vacuoles of roots and leaves were examined by cell fractionation techniques. With increasing phosphorus in medium, the contents of P in cell wall, cytoplasm and vacuoles of corn and wheat roots and leaves increased. The highest content of P was observed in cell wall, next in vacuoles, and the lowest in cytoplasm. The wheat subcellular fractions in both roots and leaves had higher concentrations of phosphorus than those of corn. Increasing phosphorus in medium significantly inhibited the intracellular Cd accumulation in both species. However, at P concentration up to 3.0 mmol L-1, the Cd content in cell wall was increased. Increasing phosphorus resulted in reduction of the subcellular Cd content in corn and wheat leaves. Compared with corn, the wheat roots had a higher Cd content in the cell wall and vacuoles and a lower in cytoplasm, while in leaf subcellular fractions the wheat cell had a higher Cd content in its vacuoles and a lower one in its cytoplasm. The results indicate that phosphorus may be involved in sequestration of Cd ionic activity in both cell wall and vacuoles by forming insoluble Cd phosphate. |
| Key Words: cadmium, corn, phosphorus, subcellular accumulation, wheat |
| Citation: Yang, Z. M., Zheng, S. J. and Hu, A. T. 1999. Subcellular accumulation of cadmium in corn and wheat plants at different levels of phosphorus. Pedosphere. 9(2): 169-176. |
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