Role of LPS in Recognition and Induced Disease Resistance in Plant Hosts of Pseudomonas solanacearum
Nearly all confirmed bacterial plant pathogens are gram-negative organisms, all of which produce some form of cell wall lipopolysaccharide (LPS). Moreover, most successful pathogens or symbionts also produce an extracellular polysaccharide (EPS). With bacterial pathogens (e.g., Pseudomonas, Xanthomonas, Erwinia, etc.) the EPS often appear as a loosely associated slime layer, whereas with bacterial symbionts (e.g., Rhizobi-um) the EPS often appear as organized capsules extending some distance from the cell surface. When one considers the most initial events in recognition between the plant cell and a colonizing bacterium, the surface LPS and EPS of the bacterium are obviously tempting molecules to consider as candidates for the initial molecular triggers of the cascade of responses between host and microbe that result either in successful invasion (symbiotic or “compatible” pathogenic reactions) or in rejection (nonsymbiotic, nonpathogenic or “incompatible” pathogenic reactions).
KeywordsHypersensitive Reaction Tissue Resistance Host Cell Wall Avirulent Isolate Bacterial Plant Pathogen
Unable to display preview. Download preview PDF.
- Carlson, R. W., 1982, Surface chemistry of Rhizobium, in: Ecology of Nitrogen Fixation (W.J. Broughton, ed.), Vol. 2, pp. 199–234, Oxford University Press, London.Google Scholar
- Dazzo, F. B., 1980, Determinants of host specificity in the Rhizobium clover symbiosis, in: Nitrogen Fixation (W. E. Newton and W. H. Orme-Johnson, eds.), Vol. 2, pp. 165–187, University Park Press, Baltimore.Google Scholar
- Duvick, J. P., Sequeira, L., and Graham, T. L., 1979, Binding of Pseudomonas solanacearum polysaccharides to plant lectin in vitro, Plant Physiol. 63(Suppl.):134.Google Scholar
- Graham, T. L., 1981, Recognition in Rhizobium-legume symbioses, Int. Rev. Cytol. 13 (Suppl.):127.Google Scholar
- Lundry, D. R., Bass, J., Castanho, B., and Graham, T. L., 1981, Protection of soybean plants against disease by phytoalexin elicitors, Plant Physiol. 67(Suppl.):75.Google Scholar
- Ng, A., Butler, R. C., Chen, C. H., and Nowotny, A., 1976, Relationship of structure to function in bacterial endotoxins. IX. Differences in the lipid moiety of endotoxic gly-colipids, J. Bactenol. 126:511.Google Scholar
- Romeiro, R., and Karr, A., 1980, Isolation of a bacterial agglutination activity for Erwinia amylovora from apple, Plant Physiol. 65(Suppl.):135.Google Scholar
- Tsang, J. C., Wang, G. S., and Alaupovic, P., 1974, Degradative effect of phenol on endotoxin and lipopolysaccharide preparations from Serratia marcescens, J. Bacterwl. 117: 786.Google Scholar