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The Mode of Action of Pronamide

Published online by Cambridge University Press:  12 June 2017

W. C. Carlson ,
E. M. Lignowski  and
H. J. Hopen
W. C. Carlson
Affiliation:
Univ. of Illinois, Urbana, Champaign, IL 61801 Field Res. Rep. for Chemagro Div. of Baychem Corp. at Monticello, IL 61856
E. M. Lignowski
Affiliation:
Univ. of Illinois, Urbana, Champaign, IL 61801 Mercyhurst College, Erie, PA 16501
H. J. Hopen
Affiliation:
Univ. of Illinois, Urbana, Champaign, IL 61801
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Abstract

Pronamide [3,5-dichloro-N-(1,1-dimethyl-2-propynyl)benzamide] inhibited root and shoot growth, but had little effect on the germination of oat (Avena sativa L.) or cucumber (Cucumis sativus L.), and sprouting of quackgrass [Agropyron repens (L.) Beauv.] buds. Root growth was more sensitive than shoot growth. Pronamide decreased the longitudinal growth rate and caused radial enlargement in the elongation region of the roots of oat seedlings within 4 hr. Dry weights of the swollen root tips increased 6% over the controls after 4 hr. Pronamide stopped the growth of established oat plants within 24 hr when added to nutrient culture medium. It caused a slight increase in 86Rb uptake by excised oat roots. Pronamide stopped normal mitosis in treated oat roots within 0.5 hr. Examination of treated root tips under a microscope showed numerous cells in arrested metaphase, c-pairs, multinucleate cells, polyploidy and swollen and misshapen nuclei. Incorporation of 14C-glucose into oat root cell walls and 14C-leucine into protein were increased by 26 and 20% respectively, following 4-hr incubations in pronamide. The primary mode of action of pronamide is mitotic poisoning.

Type
Research Article
Information
Weed Science , Volume 23 , Issue 2 , March 1975 , pp. 155 - 161
Copyright
Copyright © 1975 by the Weed Science Society of America 

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References

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