Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Bacterial lipopolysaccharides and plant-pathogen interactions
Autore:
Newman, MA; Dow, JM; Daniels, MJ;
Indirizzi:
John Innes Ctr Plant Sci Res, Sainsbury Lab, Norwich NR4 7UH, Norfolk, England John Innes Ctr Plant Sci Res Norwich Norfolk England NR4 7UH olk, England
Titolo Testata:
EUROPEAN JOURNAL OF PLANT PATHOLOGY
fascicolo: 1, volume: 107, anno: 2001,
pagine: 95 - 102
SICI:
0929-1873(200101)107:1<95:BLAPI>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
CELL-SUSPENSION CULTURES; COA-TYRAMINE N-(HYDROXYCINNAMOYL)TRANSFERASE; PSEUDOMONAS-SOLANACEARUM; XANTHOMONAS-CAMPESTRIS; DISEASE RESISTANCE; EXTRACELLULAR POLYSACCHARIDE; SOLANUM-TUBEROSUM; GENE-EXPRESSION; TOBACCO-LEAVES; LIPID-A;
Keywords:
defence; localised induced response; pepper; hydroxycinnamoyl tyramine conjugates; Xanthomonas;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
39
Recensione:
Indirizzi per estratti:
Indirizzo: Daniels, MJ John Innes Ctr Plant Sci Res, Sainsbury Lab, Norwich Res Pk, Norwich NR4 7UH, Norfolk, England John Innes Ctr Plant Sci Res Norwich Res Pk Norwich Norfolk England NR4 7UH
Citazione:
M.A. Newman et al., "Bacterial lipopolysaccharides and plant-pathogen interactions", EUR J PL P, 107(1), 2001, pp. 95-102

Abstract

Lipopolysaccharides are amphipathic molecules forming the outermost layer of the cell surface of Gram-negative bacteria. They are essential for protecting the cell from hostile environments and, in the case of pathogens, they play a direct role in interactions with eukaryotic host cells. Mutants with altered lipopolysaccharide structure have been obtained with several plant pathogenic bacteria; such mutants generally show reduced virulence. Purified lipopolysaccharide has several effects on plants, notably suppression of the hypersensitive response to subsequently inoculated avirulent pathogens. The suppression is strictly localized and is observed within a time 'window' of, typically, 10-30 h. Although infiltration of lipopolysaccharide into leaves produces no macroscopic symptoms, characteristic changes in plant gene expression can be observed. One effect is to sensitize the plant tissue to subsequent bacterial inoculation so that the sensitized tissue responds more rapidly and intensely, giving partial inhibition of bacterial growth. The synthesis of antimicrobial hydroxycinnamoyl tyramine conjugates is one facet of the process which provides an excellent biochemical model for analysing the phenomenon. Lipopolysaccharide induces the synthesis of two enzymes involved in conjugate production (tyrosine decarboxylase and tyramine-hydroxycinnamoyl transferase), but the conjugates themselves are not produced until bacteria are subsequently inoculated. Using this and other examples we discuss the mechanisms of lipopolysaccharide action on plants in thecontext of plant disease.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 07/07/20 alle ore 04:00:52