Pectic enzymes of Pseudomonas cepacia and penetration of polygalacturonase into cells

Ulrich, Jane M.

doi:10.1016/0048-4059(75)90068-5

Cited by 31 publications

(7 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Endopolygalacturonase from P. cepacia in diseased onions has a pH optimum between 4.4 and 4-6 (Ulrich, 1975). The pH dependence of the activity of the isolates tested here was also evident; all plant strains had moderate activity after 24 h at p H 4.9 whilst only one isolate had activity at pH 6.9.…”

Section: Discussionmentioning

confidence: 51%

Bacteriocin, Plasmid and Pectolytic Diversity in Pseudomonas cepacia of Clinical and Plant Origin

Gonzalez

Vidaver

1979

Journal of General Microbiology

View full text Add to dashboard Cite

161Pseudomonas cepacia strains of plant and clinical origin were compared with the type strains of P. cepacia, P. kingii and P. multivorans. Conventional biochemical tests and antibiotic sensitivity patterns supported the previous proposals of synonymy between P. cepacia, P. kingii and P. multivorans. However, bacteriocin production patterns, onion maceration tests and hydrolysis of low pH pectate agar clearly differentiated strains of clinical and plant origin into two distinct groups; these tests may therefore be helpful in epidemiological studies. In contrast, plant and clinical strains were of equal lethality to mice. Agarose gel electrophoresis indicated the presence of one or more plasmids (molecular weights 9 x lo6 to 120 x lo6) in 15 out of 16 strains of both types examined.

show abstract

Section: Discussionmentioning

confidence: 51%

Bacteriocin, Plasmid and Pectolytic Diversity in Pseudomonas cepacia of Clinical and Plant Origin

Gonzalez

Vidaver

1979

Journal of General Microbiology

View full text Add to dashboard Cite

show abstract

“…(1). Equally significant are softrot diseases of bacterial origin, particularly those associated with Pseudomonas allicola (6,15), Pseudomonas marginalis (14), and Pseudomonas cepacia (8,17).…”

mentioning

confidence: 99%

Pectic Enzyme Activities of Bacteria Associated with Rotted Onions ( Allium cepa )

Samuel

Umezurike

1981

Appl Environ Microbiol

View full text Add to dashboard Cite

The aerobic bacteria associated with soft rot in onions (Allium cepa) were isolated and identified as a Vibrio sp., Micrococcus epidermidis, Pseudomonas cepacia, an Acinetobacter sp., a Xanthomonas sp., Bacillus polymyxa, and Bacillus megaterium. With the cup-plate assay method, no pectin hydrolase could be detected from any of these isolates when they were cultured in pectin medium, but lyase and pectinesterases were detectable. Onion tissue cultures showed pectin hydrolase activity for P. cepacia and B. polymyxa and lyase and pectinesterase activities for all of the isolates, usually at higher levels of activity than those of the pectin medium culture filtrates. In both culture media, Vibrio sp. showed the highest lyase and pectinesterase activities. In the viscometric test, all of the isolates achieved at least a 50% decrease in viscosity for lyase enzyme, with M. epidermidis and Vibrio sp. recording viscosity decreases as high as 83%. The ability to cause soft rot in onion bulbs was demonstrated by P. cepacia and Xanthomonas sp. Benzoic acid at a concentration of 0.8 mg/ml caused total suppression of enzyme production, whereas sodium benzoate at this concentration reduced pectinesterase production by 71% and lyase production by 72%. The possible use of these preservatives in the control of soft rot in onions is noted.

show abstract

“…The bacterium is also able to produce pectic enzymes UANSE 1981 b), which may diffuse into the tissues and damage the plasma membrane, so that leakage from cells provides nutrients and water for the intercellular bacteria. Pectic enzymes may even kill plant cells (FOX et al 1972;ULRICH 1975). A wilting toxin has been associated with the virulence of pv.…”

Section: Discussionmentioning

confidence: 99%

The bacterial disease of ash (Fraxinus excelsior), caused by Pseudomonas syringae subsp. savastanoi pv. fraxini III. Pathogenesis

Janse

1982

European Journal of Forest Pathology

View full text Add to dashboard Cite

The pathogenesis of the bacterial disease of ash, caused by Pseudomonas syringae subsp. savastanoi pv. fraxini is macroscopically studied and by means of light-and electron-microscopy. Anatomical changes of the host tissue caused by l? syringae subsp. sawastanoipv. oleae and those caused by the fungus Nectria galli ens are compared. Pv. fraxini is a necrotrophic parasite, causing slowly growing necrotic bark swelfings characterized by extensive periderm formation. Pv. oleae causes parenchymatous galls on ash and N. galligena a real canker. The new name "bacterial knot" is proposed for the disease caused by pv.fraxini. Material and methodsMaterial examined: Fraxinus excelsior L. Macroscopic observationsMore than 200 transverse sections of material naturally infected by pv. fraxini, and by N . galligena were macroscopically compared and studied. U. S.In this paper the pathogenesis of the bacterial disease of ash, caused b Pseudomonas syrin ae subsp. means of light-and electron-microscopy, Tissue changes in ash evoked by pv. frmini were compared with those caused by the related P. syringa subsp. savastanoi pv. oleae and the fungus Nectria alligena.to the bark showing bacterial cavities, hyperplasy, hypertro hy, marked peridem formation and caused by N . galligena do not develop. Secondary fungi are found following a c t e d Invasion. Pv. fraxini is a necrotrophic parasite and is passively spreading through the intercellular spaces. Bacterial progression, which appears to be confined to the growing season of ash, IS slow contrary to that of N. galligena .The name "bacterial knot" is proposed instead of "bacterial canker", the latter being a misapplication. savastanoi pv. fraxini is described. Anatomical observations were peLrmed macroscopic f ly and by It is shown that characteristic excrescences (protuberances), caused by pv.fraxini are main f y limited necrosis. It is also demonstrated that large parenchymatous g a f Is, as caused by r. oleae or cankers as

show abstract

Pectic enzymes of Pseudomonas cepacia and penetration of polygalacturonase into cells

Cited by 31 publications

References 18 publications

Bacteriocin, Plasmid and Pectolytic Diversity in Pseudomonas cepacia of Clinical and Plant Origin

Bacteriocin, Plasmid and Pectolytic Diversity in Pseudomonas cepacia of Clinical and Plant Origin

Pectic Enzyme Activities of Bacteria Associated with Rotted Onions ( Allium cepa )

The bacterial disease of ash (Fraxinus excelsior), caused by Pseudomonas syringae subsp. savastanoi pv. fraxini III. Pathogenesis

Contact Info

Product

Resources

About