Influence of herbicides on Chickpea-Mesorhizobium symbiosisMd. Saghir Khan, Almas Zaidi and Mohd. Aamil
Department of Agricultural Microbiology, Rafi Ahmad Kidwai Institute of Agricultural Sciences, Aligarh Muslim University, Aligarh-202002, India
(Received 25 July 2002; accepted 14 January 2004)
Abstract - An experiment was carried out under greenhouse conditions in order to evaluate the effects of soil applications of bentazone, isoproturon, fluchloralin and 2,4-D on plant vitality, chlorophyll content, N and protein content, nodulation and seed production in chickpea, inoculated with Mesorhizobium ciceri. Applying ten times the recommended rates of all herbicides adversely affected the plant vigor, total chlorophyll content and nitrogen (N) content in shoot and seed production. Fluchloralin and 2,4-D gave the highest adverse effects on seed production in chickpea while protein content in seeds increased significantly following herbicide applications but decreased with an increase in application rates. The ten times the recommended rates of bentazone and 2,4-D completely decreased nodulation. Nodule occupancy determined by immunoblot assay ranged between 72 and 89 percent, while each rate of the four herbicides except the normal dose of bentazone showed an adverse effect on rhizobial populations within single nodules of the chickpea plant.
Key words: nodule bacteria / herbicides / chickpea / immunoprobes
Corresponding author: Almas Zaidi firstname.lastname@example.org
© INRA, EDP Sciences 2004