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Metabolism and Differential Susceptibility of Crabgrass and Witchgrass to Simazine and Atrazine

Published online by Cambridge University Press:  12 June 2017

D. E. Robinson  and
D. W. Greene
D. E. Robinson
Affiliation:
Dep. of Plant and Soil Sci., Univ. of Massachusetts, Amherst, Ma 01002
D. W. Greene
Affiliation:
Dep. of Plant and Soil Sci., Univ. of Massachusetts, Amherst, Ma 01002
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Abstract

Growth chamber studies showed crabgrass [Digitaria sanguinalis (L.) Scop.] to be more tolerant than witchgrass (Panicum capillare L.) to simazine [2-chloro-4,6-bis(ethylamino)-s-triazine] and atrazine [2-chloro-4-(ethylamino)-6-(isopropylamino)-s-triazine]. Both grasses were more susceptible to simazine than to atrazine. The s-triazines were taken up by both weed species in equal quantities, but witchgrass translocated larger amounts of simazine and atrazine to the shoots. The greater sensitivity of witchgrass to simazine appeared to be due to the increased translocation of unchanged simazine to the shoots. Greater sensitivity of witchgrass to atrazine was attributed to increased translocation of atrazine to the shoots and less metabolism of the s-triazine to hydrophilic metabolites. It was concluded that the hydrophilic metabolites were the peptide conjugates formed by the enzyme glutathione-S-transferase.

Type
Research Article
Information
Weed Science , Volume 24 , Issue 5 , September 1976 , pp. 500 - 504
Copyright
Copyright © 1976 by the Weed Science Society of America 

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