Summary
A genetic analysis of the regions required for symbiotic host plant nodulation by Rhizobium ‘hedysari’ led to the discovery of a 0.8 kb DNA element which presents the features of an insertion element and has no homology at DNA level with known sequences. The element, named ISRhl, appears to be specific for this Rhizobium species, and is present in all the strains tested in different numbers of copies. The majority of such copies are located on plasmids and the region of the nodulation and host specificity determinants seems to represent a hotspot for the insertion.
The complexity of hybridization patterns of strains from different isolation sites within the Mediterranean basin, is proposed as the basis for strain fingerprinting, and for evolutionary studies to track the spread of Rhizobium ‘hedysari’ in relation to that of its host legume Hedysarum coronarium.
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Meneghetti, F. et al. (1997). A Novel IS element is presented in Repeted Copies among the Nodulation Genes of Rhizibium ‘hedysari’ . In: Schenk, H.E.A., Herrmann, R.G., Jeon, K.W., Müller, N.E., Schwemmler, W. (eds) Eukaryotism and Symbiosis. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-60885-8_37
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DOI: https://doi.org/10.1007/978-3-642-60885-8_37
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