Molecular signals molecules

Any bacterial species living in a mixed microbial population, such as that of the rhizosphere, may encounter not only the molecular signal produced by a cell of the. same species but also molecular signals produced by cells of different species. The situation is made more complex by the presence of plant molecular signals, and by the fact that the same AHL molecule can be used to regulate the... 

The production and release of organic molecules by the root systems of plants have been extensively studied under a wide range of soil conditions (nutrient and water availability, pre.sence of pollutants, etc.,. see Chaps. 2 and 3). Furthermore it has been clearly demonstrated that soil microorganisms are able to produce molecules that can affect the physiology and architecture of roots (3) evidence has been also provided that molecular signals between plants and microorganisms are exchanged (see Chap. 7). 

H. P. Spaink, O. Geiger. D. M. Sheeley, A. A. N. Van Brussel, W. S. York, V. N. Reinhold, B. J. J. Lugtenberg, and E. P. Kennedy, The biochemical function of the Rhizobium leguminosarum proteins involved in the production of host-specific signal molecules. Advances in Molecular Genetics of Plant-Microbe Interactions. Vol. 1 (H. Hennecke and D. P. S. Verma, eds.), Kluwer Academic Publishers, Dordrecht, The Netherlands, 1991. 

Three phases of receptor-mediated signaling can be identified 178 Four distinct molecular mechanisms that link agonist occupancy of cell-surface receptors to functional responses have been identified 178 Cross-talk can occur between intracellular signaling pathways 179 Signaling molecules can activate gene transcription 181 Nitric oxide acts as an intercellular signaling molecule in the central nervous system 181... 

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