Development and use of Azospirillum co-aggregates using certain cationic ions and its bioinoculation effect on rice growth and yield
2009
Amutha, G. (Annamalai Univ., Annamalaina (India). Dept. of Agricultural Microbiology) | Sivakumaar, P.K. (Annamalai Univ., Annamalaina (India). Dept. of Agricultural Microbiology) | Joe, M.M. (Annamalai Univ., Annamalaina (India). Dept. of Agricultural Microbiology)
A study was conducted in the Department of Agricultural Microbiology, Faculty of Agriculture, University of Aannamalai, India during 2006. Azospirillum brasilense MTCC (microbial type cultural collection)-125, obtained from Institute of Microbial Technology, Chandigarh, India were studied for co-aggregation with other plant growth promoting rhizobacteria, such as Azotobacter chroococcum MTCC-2805, Azorhizobium caulinodans ORS (collection de O.R.S.T.O.M, Senegal) - 571, Bacillus megaterium MTCC-3353 and Pseudomonas fluorescens MTCC-4828. The co-aggregation efficiency was found to be enhanced by adding certain cationic ions, such as calcium chloride, aluminium sulphate, magnesium sulphate, ferric chloride and sodium sulphate. Combination of Azospirillum brasilense with Azotobacter chroococcum using calcium chloride at a concentration of 1.6 mM augmented the highest co-aggregation percentage and floc yield. Azospirillum co-aggregates exhibited higher survival in seed surface and spermosphere as compared to log phase PGPR cells different combinations of Azospirillum co-aggregates were also studied for phyto-stimulatory effect, such as plant height, plant dry weight, plant nitrogen content, number of panicles, number of productive tillers and grain yield in rice (cv. ADT-43) grown under pot culture condition. It was found that combination of Azospirillum brasilense and Azotobacter chroococcum proved superior in positively augmenting growth and yield of rice crop.
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