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Influence of Imazethapyr on Rhizobium Growth and its Symbiosis with Pea (Pisum sativum)

Published online by Cambridge University Press:  12 June 2017

A. Gonzalez ,
C. Gonzalez-Murua  and
M. Royuela
A. Gonzalez
Affiliation:
Dep. Ciencias del Medio Natural, Univ. Pública de Navarra
C. Gonzalez-Murua
Affiliation:
Dep. Biología Vegetal y Ecología, Univ. del País Vasco, Apdo 644, E-48080 Bilbao (Spain)
M. Royuela
Affiliation:
Dep. Ciencias del Medio Natural, Univ. Pública de Navarra, Campus Arrosadía, E-31006 Pamplona (Spain)
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Abstract

Imazethapyr is a selective herbicide used to control a wide spectrum of weeds in several legume crops, including pea. The effect of imazethapyr on pea-Rhizobium symbiosis was studied through its effect on microorganism growth, microorganism nodulation ability and plant growth. Symbiotic plants were damaged by imazethapyr concentrations higher than 1.73 μM applied preemergence. The number of nodules per plant was affected more than nodule size, suggesting a direct imazethapyr effect on the nodule initiation rather than on nodule development. However, imazethapyr did not directly affect Rhizobium because doses higher than 0.34 mM were required to cause slight effects on Rhizobium growth in a defined medium. Also, nodulation ability of bacteria treated with imazethapyr was not affected. These results suggest that imazethapyr inhibits the growth of the symbiotic plant rather than having a direct effect on the bacteria. Accordingly, symbiotic plants were less affected than the corresponding nitrate-reducing pea plants.

Keywords

Imazethapyr, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-ethyl-3-pyridinecar boxylic acidpea, Pisum sativum L. ‘Frilene.’Imidazolinonesnodulation ability
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 44 , Issue 1 , March 1996 , pp. 31 - 37
Copyright
Copyright © 1996 by the Weed Science Society of America 

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