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Hydrolysis of organic phosphates by corn and soybean roots

, : Hydrolysis of organic phosphates by corn and soybean roots. Plant & Soil 107(1): 31-38

Because of the importance of organic phosphates as sources of P for plants, this work was performed to study the hydrolysis of nine organic phosphates by sterile, intact corn (Zea mays L.) and soybean (Glycine max L.) roots. Results showed that the rates of hydrolysis of p-nitrolphenyl phosphate (PNP) in buffered solutions by roots of three varieties of corn and three varieties of soybean ranged from 13 and 22 .mu.mol PO4-Pg-1 root h-1 and from 2.1 to 2.2 .mu.mol PO4-P 0.1 g-1 root h-1, respectively. The average rate of hydrolysis of PNP in nonbuffered solutions was 2- to 3-fold lower for corn roots and 6- to 10-fold lower for soybean roots as compared with those obtained with buffered solutions. The orthophosphate released from hydrolysis of organic P compounds in buffered solutions during a 48-h incubation of corn roots showed that the maximum rate of hydrolysis of PNP was 4 to 6 times greater than the commonly used substrates: .alpha.- and .beta.-glycerophosphates, phenolphthalein diphosphate, and glucose-6-phosphate. The rates of hydrolysis of glucose-6-phosphate and glucose-1-phosphate were similar and about 6- to 12-fold lower than that of PNP. Phosphoethanolamine and phosphocholine were hydrolyzed slightly, and o-carboxyphenyl phosphate was not hydrolyzed. The rates of hydrolysis of organic P compounds in nonbuffered solutions by corn and soybean roots were 1 to 3 and 1 to 10 times lower than those in buffered solutions, respectively. The trends in rates of hydrolysis by soybean roots of buffered organic P substrates were similar to those observed with corn roots, with the exception of glucose-1-phosphate and phosphoethanolamine.


DOI: 10.1007/bf02371541

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