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Kinetics of Chlorella Inhibition by Herbicides

Published online by Cambridge University Press:  12 June 2017

Jim V. Gramlich  and
R. E. Frans
Jim V. Gramlich
Affiliation:
Department of Agronomy
R. E. Frans
Affiliation:
University of Arkansas, Fayetteville, Arkansas
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Abstract

Naphthaleneacetic acid (NAA), 2,4-dichlorophenoxyacetic acid (2,4-D), and 2-chloro-4-ethylamino-6-isopropylamino s-triazine (atrazine) were applied to Chlorella pyrenoidosa in an attempt to characterize mathematically the growth inhibition responses obtained. (Chlorella was found to serve well as a test organism.) Inhibition results induced by NAA and 2,4-D satisfactorily supported the hypothesis inherent in the kinetic interpretation. Results with atrazine were most satisfactorily interpreted by a probit analysis which showed large differences in rate of toxicity between high and low concentrations. This difference is thought to be responsible for the poor fit to a straight line in the reciprocal plots of the kinetic analysis. It is assumed that growth inhibition by atrazine resulted from a blocking of the photosynthetic process.

Type
Research Article
Information
Weeds , Volume 12 , Issue 3 , July 1964 , pp. 184 - 189
Copyright
Copyright © 1964 Weed Science Society of America 

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References

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