Asian Journal of Microbiology, Biotechnology & Environmental Sciences Paper

Vol 9, Issue 4, 2007; Page No.(959-964)

ROLE OF RHIZOBIAL L1POPOLYSACCHARIDES IN HOST SPECIFICITY

MAHIPAL SINGH KESAWAT, MANORAMA AND BHAGANAGARE GOVINDRAJ RAMAKANTRAO

Abstract

The rhizobia are gra m-nuga t ive bacteria that posses a unique ability to elicite nodule formation in roots or in some cases stern of leguminous plank, in which they convert atmospheric nitrogen into the usable forms by host plant. The rhizobia have high host specificity in cross inoculation. The most of the rhizobial species was observed to coadapted particular range of the host plant. But some strain showed high degree of host specificity while other had very broad host range. The rhizobial isolates from cowpea, green gram, pea, black gram, soybean and chickpea were inoculated to reciprocal. The specificity of the rhizobial culture inoculated in the same host was resulted in compatible interactions. In cross-inoculation, cowpea, pea, chickpea and soybean isolates were showed compatible interactions with chickpea, cowpea, cowpea and cowpea, respectively, while in other legume crops showed incompatible interactions. The differences were also observed in plant height and colour of leaves in compatible and incompatible interactions among rhizobia and legume host. In compatible interactions, the more plant height and dark green colour of the leaves was observed as compared to incompatible interactions. The LPS from compatible isolates were smeared onto incompatible legume seeds and on it incompatible isolates were inoculated. The plants showed compatible interactions, so that role of LPS in host specificity by cross infectivity showed that LPS might be able to elicite nodule formation and having role in host specificity.

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