Absorption and Translocation of Phosphate-32P

  • Thomas C. Moore


Terrestrial seed plants require approximately 12 mineral elements, in addition to nitrogen, which they absorb as inorganic ions through their roots from the soil. Ion absorption occurs by two basic processes commonly known as passive and active ion uptake. Passive absorption is largely a diffusional process and does not require direct expenditure of metabolic energy. Active absorption, in contrast, is a metabolically dependent, highly regulated process by which certain species of ions are accumulated in the plant to concentrations greatly in excess of the concentration in the soil, while other ion species are excluded. Both passive and active ion uptake processes generally are influenced by factors which affect respiration and other metabolic processes in the root, with the latter process being more directly affected in this way than the former. Factors which influence transpiration rate often influence rates of ion absorption also, but passive ion absorption is more directly subject to influence in this way than is active uptake.


Nutrient Solution Mineral Nutrition Plant Press Background Total Trial Exposure 
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Copyright information

© Springer-Verlag New York Inc. 1974

Authors and Affiliations

  • Thomas C. Moore
    • 1
  1. 1.Department of Botany and Plant PathologyOregon State UniversityCorvallisUSA

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