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Nodulation of Aeschynomene afraspera and A. indica by photosynthetic Bradyrhizobium sp. strain ORS285: the Nod-dependent versus the Nod-independent symbiotic interaction

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Abstract
Here, we present a comparative analysis of the nodulation processes of Aeschynomene afraspera and A. indica that differ in their requirement for Nod factors (NF) to initiate symbiosis with photosynthetic bradyrhizobia. The infection process and nodule organogenesis was examined using the green fluorescent protein labeled Bradyrhizohium sp. strain ORS285 able to nodulate both species. In A. indica, when the NF-independent strategy is used, bacteria penetrated the root intercellularly between axillary root hairs and invaded the subepidermal cortical cells by invagination of the host cell wall. Whereas the first infected cortical cells collapsed, the infected ones immediately beneath kept their integrity and divided repeatedly to form the nodule. In A. afraspera, when the NF-dependent strategy is used, bacteria entered the plant through epidermal fissures generated by the emergence of lateral roots and spread deeper intercellularly in the root cortex, infecting some cortical cells during their progression. Whereas the infected cells of the lower cortical layers divided rapidly to form the nodule, the infected cells of the upper layers gave rise to an outgrowth in which the bacteria remained enclosed in large tubular structures. Together, two distinct modes of infection and nodule organogenesis coexist in Aeschynomene legumes, each displaying original features.
Keywords
BACTEROIDS, GROUNDNUT, RHIZOBIUM, LEGUME SYMBIOSIS, SESBANIA-ROSTRATA, INFECTION THREADS, STEM NODULATION, ARACHIS-HYPOGAEA L, ROOT-NODULES, DIVERSITY

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Chicago
Bonaldi, Katia, Daniel Gargani, Yves Prin, Joel Fardoux, Djamel Gully, Nico Nouwen, Sofie Goormachtig, and Eric Giraud. 2011. “Nodulation of Aeschynomene Afraspera and A. Indica by Photosynthetic Bradyrhizobium Sp. Strain ORS285: The Nod-dependent Versus the Nod-independent Symbiotic Interaction.” Molecular Plant-microbe Interactions 24 (11): 1359–1371.
APA
Bonaldi, K., Gargani, D., Prin, Y., Fardoux, J., Gully, D., Nouwen, N., Goormachtig, S., et al. (2011). Nodulation of Aeschynomene afraspera and A. indica by photosynthetic Bradyrhizobium sp. strain ORS285: the Nod-dependent versus the Nod-independent symbiotic interaction. MOLECULAR PLANT-MICROBE INTERACTIONS, 24(11), 1359–1371.
Vancouver
1.
Bonaldi K, Gargani D, Prin Y, Fardoux J, Gully D, Nouwen N, et al. Nodulation of Aeschynomene afraspera and A. indica by photosynthetic Bradyrhizobium sp. strain ORS285: the Nod-dependent versus the Nod-independent symbiotic interaction. MOLECULAR PLANT-MICROBE INTERACTIONS. 2011;24(11):1359–71.
MLA
Bonaldi, Katia, Daniel Gargani, Yves Prin, et al. “Nodulation of Aeschynomene Afraspera and A. Indica by Photosynthetic Bradyrhizobium Sp. Strain ORS285: The Nod-dependent Versus the Nod-independent Symbiotic Interaction.” MOLECULAR PLANT-MICROBE INTERACTIONS 24.11 (2011): 1359–1371. Print.
@article{1939656,
  abstract     = {Here, we present a comparative analysis of the nodulation processes of Aeschynomene afraspera and A. indica that differ in their requirement for Nod factors (NF) to initiate symbiosis with photosynthetic bradyrhizobia. The infection process and nodule organogenesis was examined using the green fluorescent protein labeled Bradyrhizohium sp. strain ORS285 able to nodulate both species. In A. indica, when the NF-independent strategy is used, bacteria penetrated the root intercellularly between axillary root hairs and invaded the subepidermal cortical cells by invagination of the host cell wall. Whereas the first infected cortical cells collapsed, the infected ones immediately beneath kept their integrity and divided repeatedly to form the nodule. In A. afraspera, when the NF-dependent strategy is used, bacteria entered the plant through epidermal fissures generated by the emergence of lateral roots and spread deeper intercellularly in the root cortex, infecting some cortical cells during their progression. Whereas the infected cells of the lower cortical layers divided rapidly to form the nodule, the infected cells of the upper layers gave rise to an outgrowth in which the bacteria remained enclosed in large tubular structures. Together, two distinct modes of infection and nodule organogenesis coexist in Aeschynomene legumes, each displaying original features.},
  author       = {Bonaldi, Katia and Gargani, Daniel and Prin, Yves and Fardoux, Joel and Gully, Djamel and Nouwen, Nico and Goormachtig, Sofie and Giraud, Eric},
  issn         = {0894-0282},
  journal      = {MOLECULAR PLANT-MICROBE INTERACTIONS},
  keyword      = {BACTEROIDS,GROUNDNUT,RHIZOBIUM,LEGUME SYMBIOSIS,SESBANIA-ROSTRATA,INFECTION THREADS,STEM NODULATION,ARACHIS-HYPOGAEA L,ROOT-NODULES,DIVERSITY},
  language     = {eng},
  number       = {11},
  pages        = {1359--1371},
  title        = {Nodulation of Aeschynomene afraspera and A. indica by photosynthetic Bradyrhizobium sp. strain ORS285: the Nod-dependent versus the Nod-independent symbiotic interaction},
  url          = {http://dx.doi.org/10.1094/MPMI-04-11-0093},
  volume       = {24},
  year         = {2011},
}

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