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Effect of Some s-Triazine Herbicides on Phosphatases from Corn (Zea mays) Roots

Published online by Cambridge University Press:  12 June 2017

Luciano Scarponi  and
Piero Perucci
Luciano Scarponi
Affiliation:
Inst. Agric. and Forest Chem., Univ. Basilicata
Piero Perucci
Affiliation:
Inst. Agric. Chem., Univ. Perugia
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Abstract

The influence of some s-triazine herbicides on acid phosphatase (acid Pase) and phosphodiesterase (PDase) from corn (Zea mays L. var. ‘Orfeo’) roots was investigated. Terbutryn [N-(1,1-dimethylethyl)-N′-ethyl-6-(methylthio)-1,3,5-triazine-2,4-diamine] stimulated both phosphatases, whereas prometryn [N,N′-bis(1-methylethyl)-6-(methylthio)-1,3,5-triazine-2,4-diamine] stimulated only the PDase. Atrazine [6-chloro-N-ethyl-N′-(1-methylethyl)-1,3,5-triazine-2,4-diamine] and desmetryn [N-methyl-N′-(1-methylethyl)-6-(methylthio)-1,3,5-triazine-2,4-diamine] inhibited both phosphatases to varying degrees. Atraton [N-ethyl-6-methoxy-N′-(1-methylethyl)-1,3,5-triazine-2,4-diamine], prometon [6-methoxy-N,N′-bis(1-methylethyl)-1,3,5-triazine-2,4-diamine], and simazine (6-chloro-N,N′-diethyl-1,3,5-triazine-2,4-diamine) inhibited acid Pase. No effect was exerted by ametryn [N-ethyl-N′-(1-methylethyl)-6-(methylthio)-1,3,5-triazine-2,4-diamine]. The enzyme assays and the kinetic parameters demonstrated that the interferences observed were due to an action on the synthesis of one or both enzymes rather than on the enzyme reactions. The types of the N-alkyl and the C1-substituent groups in the structures of the s-triazines tested appear important in determining the degree of the interference.

Keywords

Phosphatase activitiesVmaxKmherbicide structure-phosphatase activity
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 34 , Issue 6 , November 1986 , pp. 807 - 810
Copyright
Copyright © 1986 by the Weed Science Society of America 

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References

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