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Kinetic Analysis of Nitrogen Influence on Phosphate Absorption by Excised Roots of Monterey Pine Seedlings

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The effect of nitrate pretreatment on the P uptake mechanism of nonmycorrhizal Monterey pine was determined, utilizing 6 cm apical root sections immersed in P concentrations ranging from 0.005 mM to 0.400 mM. Graphical analysis revealed the typical curvilinear relationship, indicating two P uptake mechanisms: one at high external P concentrations and the other at low external P concentrations. In the low external P range, common to soil solutions, nitrate pretreatment increased the phosphate transport capacity (V max) of the tissue 25 percent while having no effect on affinity of the carrier for the P ion (Km). Forest Sci. 20:279-282.

Keywords: Ion uptake; Pinus radiata

Document Type: Journal Article

Affiliations: Extension Specialist and Professor of Soils, Agronomy Department, Purdue University, Lafayette, Ind.

Publication date: September 1, 1974

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 in forestry

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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