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THE PLANT CELL, Vol 6, Issue 10 1357-1374, Copyright © 1994 by American Society of Plant Biologists
Rhizobium meliloti Lipooligosaccharide Nodulation Factors: Different Structural Requirements for Bacterial Entry into Target Root Hair Cells and Induction of Plant Symbiotic Developmental Responses
M. Ardourel, N. Demont, F. Debelle, F. Maillet, F. de Billy, J. C. Prome, J. Denarie and G. Truchet
Laboratoire de Biologie Moleculaire des Relations Plantes-Microorganismes, CNRS-INRA, B.P. 27, 31326 Castanet-Tolosan Cedex, France
Rhizobium meliloti produces lipochitooligosaccharide nodulation NodRm
factors that are required for nodulation of legume hosts. NodRm factors are
O-acetylated and N-acylated by specific C16-unsaturated fatty acids. nodL
mutants produce non-O-acetylated factors, and nodFE mutants produce factors
with modified acyl substituents. Both mutants exhibited a significantly
reduced capacity to elicit infection thread (IT) formation in alfalfa.
However, once initiated, ITs developed and allowed the formation of
nitrogen-fixing nodules. In contrast, double nodF/nodL mutants were unable
to penetrate into legume hosts and to form ITS. Nevertheless, these mutants
induced widespread cell wall tip growth in trichoblasts and other epidermal
cells and were also able to elicit cortical cell activation at a distance.
NodRm factor structural requirements are thus clearly more stringent for
bacterial entry than for the elicitation of developmental plant responses.
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M. E. Etzler, G. Kalsi, N. N. Ewing, N. J. Roberts, R. B. Day, and J. B. Murphy
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A. Timmers, M. Auriac, and G Truchet
Refined analysis of early symbiotic steps of the Rhizobium-Medicago interaction in relationship with microtubular cytoskeleton rearrangements
Development,
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J.-L. Pingret, E.-P. Journet, and D. G. Barker
Rhizobium Nod Factor Signaling: Evidence for a G Protein–Mediated Transduction Mechanism
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A. Timmers, M. Auriac, F de Billy, and G Truchet
Nod factor internalization and microtubular cytoskeleton changes occur concomitantly during nodule differentiation in alfalfa
Development,
January 2, 1998;
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T Arcondeguy, I Huez, P Tillard, C Gangneux, F de Billy, A Gojon, G Truchet, and D Kahn
The Rhizobium meliloti PII protein, which controls bacterial nitrogen metabolism, affects alfalfa nodule development.
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The common nodABC genes of Rhizobium meliloti are host-range determinants
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