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Soil Science Society of America Journal Abstract -

Hydrolysis and Uptake of Pyrophosphate by Plant Roots1


This article in SSSAJ

  1. Vol. 34 No. 1, p. 83-86
    Received: June 13, 1969
    Accepted: Aug 8, 1969

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  1. J. W. Gilliam2



Pyro- and orthophosphate solutions were equally effective in supplying P to P-deficient wheat (Triticum vulgare), corn (Zea mays L.), and barley (Hordeum vulgare L.). P-deficient roots absorbed the pyrophosphate ion per se and also rapidly hydrolyzed the pyrophosphate as indicated by 40–55% of the P being present as the ortho form after 24 hours. It was concluded that this hydrolysis was caused by phosphatase present on external portions of the roots. Wheat roots which were P- deficient had approximately 1.6 times as much phosphatase activity as non-deficient roots (per unit weight) as determined by appearance of orthophosphate. Evidence indicated that P- deficient wheat roots exposed only to orthophosphate produced significant quantities of pyrophosphate.

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