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Diclofop and MCPA Influence on Coleoptile Growth

Published online by Cambridge University Press:  12 June 2017

Wayne A. Olson ,
John D. Nalewaja ,
Glen L. Schroeder  and
Murray E. Duysen
Wayne A. Olson
Affiliation:
Dep. Agron., North Dakota State Univ., Fargo, ND 58105
John D. Nalewaja
Affiliation:
Dep. Agron., North Dakota State Univ., Fargo, ND 58105
Glen L. Schroeder
Affiliation:
Mobay Chem. Corp., 1233 4th St. N., Fargo, ND 58102
Murray E. Duysen
Affiliation:
Dep. Bot., North Dakota State Univ., Fargo, ND 58105
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Abstract

Experiments were conducted using the Avena coleoptile straight-growth test to determine the influence of diclofop {2-[4-(2,4-diclorophenoxy)phenoxy] propanoic acid}, as the acid or methyl ester, and MCPA {[(4-chloro-o-tolyl)oxy] acetic acid} on coleoptile growth of several species. Diclofop ester was a three-fold stronger inhibitor of oat (Avena sativa L. ‘Terra’) coleoptile growth than the free acid. The concentration of diclofop ester needed to inhibit 50% of the oat coleoptile growth was not influenced by IAA (indole-3-acetic acid) concentration. Oat coleoptile growth in the presence of 5 μM IAA plus 5 μM diclofop ester increased for 2 h after treatment and then decreased, so that the coleoptile length was less at the end of the 24-h assay period than at the beginning of the diclofop-ester treatment. Diclofop ester inhibited the coleoptile growth of wild oat (Avena fatua L.) > oat > wheat (Triticum aestivum L. ‘Era’) > corn (Zea mays L. inbred ‘A-239’) > corn inbred ‘CI-66’. MCPA added to the treatment solution did not overcome oat coleoptile growth inhibition from diclofop ester or acid.

Keywords

Avenaauxinsantiauxinscoleoptile test
Type
Research Article
Information
Weed Science , Volume 29 , Issue 5 , September 1981 , pp. 597 - 600
Copyright
Copyright © Weed Science Society of America 

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References

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