| 不同磷水平下玉米和小麦植株亚细胞中镉的积累 |
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| 作者姓名： | YANG Zhi-Min ZHENG Shao-Jian HU Ai-Tang |
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| 作者单位： | [1]CollegeofNaturalResourcesandEnvironmenttalSciences,NanjingAgriculturalUniversity,Nanjing210095 [2]Depart,NanjingAgriculturalUniversity,Nanjing210095 |
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| 基金项目： | *1Project (No.39500059) supported by the National Natural Science Foundation of China. |
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| 摘 要： | Corn and wheat plants were grown in a nutrient culture solution at four levels of phosphorus (0,0.12,0.60 and 3.0mmol L^-1) and two levels of cadmium(0 and 4.0umol 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 hab 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 3.0mmol L^-1,the Cd content in cell wall was increased.Increasing phosphorus resulted in reduction of the subcellular Cd content in cell wall was increased.Increasing phosphorus resulted in reduction of the subcellualr 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 vaculoes by forming insoluble Cd phosphate.
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| 关 键 词： | 镉累积 玉米植株 小麦植株 磷水平 亚细胞累积 组织分布 |
Subcellular accumulation of cadmium in corn and wheat plants at different levels of phosphorus |
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| YANG Zhi-Min,ZHENG Shao-Jian,HU Ai-Tang.Subcellular accumulation of cadmium in corn and wheat plants at different levels of phosphorus[J].Pedosphere,1999,9(2):169-176. |
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| Authors: | YANG Zhi-Min ZHENG Shao-Jian and HU Ai-Tang |
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| Institution: | [1]CollegeofNaturalResourcesandEnvironmenttalSciences,NanjingAgriculturalUniversity,Nanjing210095 [2]Depart,NanjingAgriculturalUniversity,Nanjing210095 |
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| Abstract: | Corn and wheat plants were grown in a nutrient culture solution at four levels of phosphorus (0,0.12,0.60 and 3.0mmol L^-1) and two levels of cadmium(0 and 4.0umol 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 hab 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 3.0mmol L^-1,the Cd content in cell wall was increased.Increasing phosphorus resulted in reduction of the subcellular Cd content in cell wall was increased.Increasing phosphorus resulted in reduction of the subcellualr 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 vaculoes by forming insoluble Cd phosphate. |
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| Keywords: | cadmium corn phosphorus subcellular accumulation wheat |
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