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Rhizobium nodulation genes involved in root hair curling (Hac) are functionally conserved

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Summary

Five specific transposon-induced nodulation defective (Nod) mutants from different fast-growing species ofRhizobium were used as the recipients for the transfer of each of several endogenous Sym(biosis) plasmids or for recombinant plasmids that encode early nodulation and host-specificity functions. The Nod mutants were derived fromR. trifolii, R. meliloti and from a broad-host-rangeRhizobium strain which is able to nodulate both cowpea (tropical) legumes and the non-legumeParasponia. These mutants had several common features (a), they were Nod on all their known plant hosts, (b), they could not induce root hair curling (Hac) and (c), the mutations were all located on the endogenous Sym-plasmid of the respective strain. Transfer to these mutants of Sym plasmids (or recombinant plasmids) encoding heterologous information for clover nodulation (pBR1AN, pRt032, pRt038), for pea nodulation (pJB5JI, pRL1JI::Tn1831), for lucerne nodulation (pRmSL26), or for the nodulation of both tropical legumes and non-legumes (pNM4AN), was able to restore root hair curling capacity and in most cases, nodulation capacity of the original plant host(s). This demonstrated a functional conservation of at least some genes involved in root hair curling. Positive hybridization between Nod DNA sequences fromR. trifolii and from a broad-host-rangeRhizobium strain (ANU240) was obtained to other fast-growingRhizobium strains. These results indicate that at least some of the early nodulation functions are common in a broad spectrum ofRhizobium strains.

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Djordjevic, M.A., Schofield, P.R., Ridge, R.W. et al. Rhizobium nodulation genes involved in root hair curling (Hac) are functionally conserved. Plant Mol Biol 4, 147–160 (1985). https://doi.org/10.1007/BF02418762

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