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Hydrolysis and Uptake of Pyrophosphate by Plant Roots
Author(s) -
Gilliam J. W.
Publication year - 1970
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1970.03615995003400010025x
Subject(s) - pyrophosphate , hordeum vulgare , hydrolysis , zea mays , chemistry , phosphatase , phosphate , poaceae , agronomy , biochemistry , enzyme , biology
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.