Direct monitoring of Rhizobium sp. (Cicer) in nodules and soil using lac Z fusions |
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Authors: | D V Kamboj P K Sharma B S Kundu |
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Institution: | (1) Department of Microbiology, College of Basic Sciences and Humanities, CCS Haryana Agricultural University, 125004 HISAR, India |
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Abstract: | We constructed lacZ fusions in Rhizobium sp. (Cicer) by random Tn5-lacZ mutagenesis. The lacZ+ fusants formed blue colonies on a Rhizobial minimal medium containing 5-bromo-4-chloro-3-indolyl- -D-galactopyranoside (X-gal). Rhizobium sp. (Cicer) fusant HSL-2 was identified in nodules and soil in a mixed population on the basis of the lacZ+ phenotype. Nodule occupancy of inoculated Rhizobium sp. (Cicer) HSL-2 (lacZ+) was assessed by directly streaking the nodule sap on X-gal plates. This method revealed differences between rhizobia carrying identical antibiotic markers. The rhizobial population in soil was estimated by direct plate counts using a medium containing X-gal. Introduction of lacZ into the Rhizobium sp. thus provided a simple and direct method for identifying strains from nodules and soil. |
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Keywords: | Nodulation Competitiveness Rhizobium sp (Cicer) lacZ fusion |
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