Summary
Rhizobium and Bradyrhizobium bacteria gain intercellular entry into roots of the non-legume Parasponia andersonii by stimulating localized sites of cell division which disrupt the epidermis. Infection threads are then initiated from intercellular colonies within the cortex. Infection via the information of infection threads within curled root hairs, which commonly occurs in legumes, was not observed in Parasponia. The conserved nodulation genes nodABC, necded for the curling of legume root hairs, were not essential for the initiation of infection, however, these genes were required for Parasponia prenodule development. In contrast, the nodD gene of Rhizobium strain NGR234 was essential for the initiation of infection. In addition, successful infection required not only nodD but a region of the NGR234 symbiotic plasmid which is not needed for the nodulation of legumes. Agrobacterium tumefaciens carrying this Parasponia specific region, as well as legume nod genes, was able to form nodules on Parasponia which reached an advanced stage of development.
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Bender, G.L., Goydych, W., Rolfe, B.G. et al. The role of Rhizobium conserved and host specific nodulation genes in the infection of the non-legume Parasponia andersonii . Molec Gen Genet 210, 299–306 (1987). https://doi.org/10.1007/BF00325698
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DOI: https://doi.org/10.1007/BF00325698