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- W2073103676 abstract "The broad host range of Rhizobium sp. NGR234 is based mainly on its ability to secrete a family of lipooligosaccharide Nod factors. To monitor Nod-factor purification, we used the small seeded legume Macroptilium atropurpureum, which responds evenly and consistently to Nod factors. At concentrations between approximately equal to 10(-11) M and 10(-9) M, this response takes the form of deformation of the root hairs. Higher concentrations (approximately equal to 10(-9) to 10(-7) M), provoked profound shepherd's crook type curling of the root hairs. Similar concentrations of Nod factors of Bradyrhizobium japonicum, Rhizobium leguminosarum, and R. meliloti also provoked marked curling of the root hairs, but the latter two species are unable to nodulate Macroptilium. On the other hand, plant hormones, hormone-like substances, inhibitors of hormone action, as well as substituents of Nod factors were without effect in this bioassay. We thus conclude that only Nod factors are capable of inducing shepherd's crook type curling of Macroptilium root hairs. Perturbations in the auxin-cytokinin balance induced pseudo nodulation on M. atropurpureum, as did NodNGR factors at concentrations between 10(-7) and 10(-6) M. Concomitant inoculation of Macroptilium with a NodABC- mutant of NGR234 and sulfated NodNGR factors (NodNGR[S]) gave rise to plants that slowly greened, showing that the NodNGR factors permitted entry of the Nod- mutant into the roots." @default.
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- W2073103676 title "Biological Activity of<i>Rhizobium</i>sp. NGR234 Nod-factors on<i>Macroptilium atropurpureum</i>" @default.
- W2073103676 doi "https://doi.org/10.1094/mpmi-6-764" @default.
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