Words similar to rhizobial
Example sentences for: rhizobial
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Rhizobia have the ability to transfer genes horizontally to other bacteria, and M. loti carries a 'symbiosis island' which spans approximately 9% of its genome and has been shown to have a role in rhizobial evolution via HGT [ 46 ] . This symbiosis island contains certain genes involved in nodulation and nitrogen-fixation functions, but none of these is a homolog of the nematode HGT candidates we have identified.
Collectively, comparison of the nematode and rhizobial nodL genes suggests that each is adapted for function in the organism in which it resides, and despite the high degree of similarity between the amino-acid sequences of these genes, the DNA sequences are strikingly different.
Nod factors are a rhizobial species-specific family of lipo-chito-oligosaccharides which function in signal exchange between the bacterium and its symbiotic partner plant [ 38 ] . The first visible signs of nodule formation (root-hair deformation) as part of the symbiotic pathway are triggered by Nod factors [ 39 ] , and although the specific mechanisms of Nod factor function remain unknown, it is clear that it has a central role in initiation of cell division and possibly also nodule differentiation in the root [ 40 ] . For most rhizobia, the product of nodD acts as a transcriptional activator and induces expression of a set of nod genes.
Nevertheless, because the origin of many of the nematode HGT candidates appeared to be rhizobial, we wished to investigate the organization of the bacterial homologs.
Two of the Meloidogyne genes revealed by our filters, which encode an L-threonine aldolase gene (MI01644) and a deduced protein of unknown function (MI00109), exhibit striking amino-acid identity to rhizobial proteins (48% and 51% respectively), but a complete absence of meaningful homology with any eukaryotic sequence (Table 3).
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