Abstract
The present study was conducted to evaluate and characteriseRhizobium leguminosarum bv.trifolii nodulating rhizobia isolated from root nodules of indigenous and exotic ecotypes of white clover (Trifolium repens L.) in the mountain region of the State of Azad Jammu and Kashmir Pakistan. Isolates from indigenous ecotypes were collected from three different locations i.e. Tollipir, Banjosa, and Rawalakot while exotic ecotypes i.e. Irrigation and NuSiral were collected from Australia. Preliminary characterisation of isolates was carried-out on the basis of colony characteristics, phosphorus solubilisation, osmotic potential, relative absorbance, indole acetic acid spot test, mean doubling time and C-source utilisation.Rhizobium population in the respective soils was also estimated by using most probable number (MPN). The maximumRhizobium population of 5.8 × 106 g−1 soil was recorded in Tollipir soil compared with population of 3.1. × 105 g−1 soil in Rawalakot soil. All strains showed homology to a typicalRhizobium strain and identified asRhizobium on the basis of growth pattern and other testing parameters. The isolates were Gram negative, small rods and acid producing fast growers with a mean generation time in between 2.7 to 3.4 h. All isolates except isolates from Tollipir showed resistant against four antibiotics except tetracycline. Isolates from Banjosa, Tollipir and Rawalakot (indigenous) had larger surface charge than isolates from Irrigation and NuSiral (exotic). Highest osmotic potential of −31.02 bar was recorded in the isolates from Banjosa while isolates from Tollipir and Rawalakot had an osmotic potential of −22 bar. Field evaluation of isolated isolates showed significant increase in plant growth and root nodulation. The study will be useful for identifying the isolates under laboratory conditions and developing successful inoculation strategy for the production of white clover in the mountain region of Azad Jammu and Kashmir.
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Tahir, M.M., Abbasi, M.K. & Hafeez, F.Y. Characterisation and evaluation ofRhizobium leguminosarum bv.trifolii nodulating rhizobia isolated from white clover native to Azad Jammu and Kashmir, Pakistan. Ann. Microbiol. 58, 181–188 (2008). https://doi.org/10.1007/BF03175314
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DOI: https://doi.org/10.1007/BF03175314