Hydrolysis and Uptake of Pyrophosphate by Plant Roots1
- 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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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