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Uptake of Organic Phosphorus by ArbuscularMycorrhizal Red CloverEnglish Full Text

SONG YONGCHUN1, LI XIAOLIN1 and P. CHRISTIE21Department of Plant Nutrition, College of Agricultural Resources and Environmental Sciences, ChinaAgricultuml University, Beijing 100094 (China)2Department of Agricultural and Environmental Science, The Queen’s

Abstract: The capacities of two arbuscular mycorrhizal (AM) fungi, Glomus mosseae and Glomus versderme, tomineralize added organic P were studied in a sterilized calcareous soil. Mycorrhizal (inoculated with eitherof the AM fungi) and non-mycorrhizal red clover (Trghlium pmtense L.) plants were grown for eight weeksin pots with upper root, central hyphal and lower soil compartments. The hyphal and soil compartmentsreceived either organic P (as Na-phytate) or inorganic P (as KH2PO4) at tbe rate of 50 mg P kg-1. No P wasadded to the root compartments. Control pots received no added P. Yields were higher in mycorrhizal than innon-mycorrhizal clover. Mycorrhizal inoculation doubled shoot P concentration and more than doubled totalP uptake of plaflts in P-amended soil, irrespective of the form of applied P. The mycorrhizal contributionto inorganic P uptake was 80% or 76% in plants inoculated with G. mosseae or G. verefforme, respectively.Corresponding va1ues were 74% and 82% when Na-phytate was applied. In the root compartments of themycorrhizal treatments, the proportion of root length infected, hyphal length density and phosphatase activitywere all higher when organic P was applied than when inorganic P was added.
  • Series:

    (D) Agriculture

  • Subject:

    Fundamental Science of Agriculture; Agronomy

  • Classification Code:

    S154.4

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