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Effect of Several Herbicides on Dipeptidase Activity of Squash Cotyledons

Published online by Cambridge University Press:  12 June 2017

Ruey-Chyong Tsay  and
Floyd M. Ashton
Ruey-Chyong Tsay
Affiliation:
Dep. of Bot., Univ. of California, Davis, California 95616
Floyd M. Ashton
Affiliation:
Dep. of Bot., Univ. of California, Davis, California 95616
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Abstract

The dipeptidase activity of the cotyledons of the squash (Cucurbita maxima Duch. ‘Hubbard’) increases during germination. Several herbicides inhibited this increase in various degrees. Those herbicides inhibiting the development of dipeptidase activity 70% or more were (2,4-dichlorophenoxy)-acetic acid (2,4-D), 3,6-dichloro-o-anisic acid (dicamba), (2,3,6-trichlorophenyl)acetic acid (fenac), and N-1-naphthylphthalmic acid (naptalam). Those inhibiting dipeptidase activity by 63 to 34% were 4-amino-3,5,6-trichloropicolinic acid (picloram), 2,6-dichlorobenzonitrile (dichlobenil), 3,5-dibromo-4-hydroxybenzonitrile (bromoxynil), 3-amino-s-triazole (amitrole), 2-chloro-4-(ethylamino)-6-(isopropylamino)-s-triazine (atrazine), 7-oxabicyclo[2.2.1] heptane-2,3-dicarboxylic acid (endothall), and 5-bromo-3-sec-butyl-6-methyluracil (bromacil). Those causing only slight inhibition, 24 to 16%, were N,N-dimethyl-2,2-diphenylacetamide (diphenamid), isopropyl m-chlorocarbanilate (chlorpropham), and α,α,α-trifluoro-2,6-dinitro-N,N-dipropyl-p-toluidine (trifluralin); 3-(p-chlorophenyl)-1,1-dimethylurea (monuron) was essentially the same as the control. However, 2,2-dichloropropionic acid (dalapon), O,O-diisopropyl phosphorodithioate S-ester with N-(2-mercaptoethyl)-benzenesulfonamide (bensulide), N,N-diallyl-2-chloroacetamide (CDAA), and 2-chloroallyl diethyldithiocarbamate (CDEC) were somewhat stimulatory. When compared with previously reported herbicide activity on the proteinase activity, those herbicides which inhibited dipeptidase activity did not necessarily affect proteinase activity to the same degree.

Type
Research Article
Information
Weed Science , Volume 19 , Issue 6 , November 1971 , pp. 682 - 684
Copyright
Copyright © Weed Science Society of America 

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References

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