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

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...

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Bibliographic Details
Published in:Weed science 1996-01, Vol.44 (1), p.31-37
Main Authors: Gonzalez, A., Gonzalez-Murua, C., Royuela, M.
Format: Article
Language:English
Subjects:
CONTROL QUIMICO
DESHERBAGE
DOSE D'APPLICATION
DOSIS DE APLICACION
EFECTOS SECUNDARIOS
EFFET SECONDAIRE
ESCARDA
FIJACION DEL NITROGENO
FITOTOXICIDAD
FIXATION DE L'AZOTE
FORMATION DE NODOSITES
HERBICIDAS
HERBICIDE
Herbicides
INDICE DE CRECIMIENTO
Legumes
LUTTE CHIMIQUE
Microorganisms
NODOSITE RACINAIRE
NODULACION
Nodulation
Nodules
NUDOSIDADES RADICULARES
Peas
Physiology, Chemistry, and Biochemistry
PHYTOTOXICITE
PISUM SATIVUM
Plant growth
Plants
Rhizobium
RHIZOBIUM LEGUMINOSARUM
SIMBIOSIS
SYMBIOSE
Symbiosis
TAUX DE CROISSANCE
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Summary: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.
ISSN:0043-1745
1550-2759
DOI:10.1017/S0043174500093516