Erwinia Herbicola
Mostrando 1-12 de 69 artigos, teses e dissertações.
-
1. Bactérias fitopatogênicas fixadoras de N2 em associação com plantas.
Descrição das espécies de bactérias diazotroficas fitopatogênica. Agrobacterium tumefaciens. Burkholderia spp. Herbaspirillun rubrisubalbicans(Christopher e Edgerton, 1932). POsição taxonômica. Pantoae herbicola sin. Erwinia herbicola.
Seropédica: EMBRAPA-CNPAB. Publicado em: 2011
-
2. Genetic Transfer of Episomic Elements Among Erwinia Species and Other Enterobacteria: F′lac+
The episomic element F′lac+ was transferred, probably by conjugation, from Escherichia coli to Lac− strains of Erwinia herbicola, Erwinia amylovora, and Erwinia chrysanthemi (but not to several other Erwinia spp. In preliminary trials). The lac genes in the exconjugants of the Erwinia spp. showed varying degrees of stability depending on the strain (stab
-
3. Fructan from Erwinia herbicola.
Levan production by strains of Erwinia herbicola is common, and this property has some taxonomic significance for species differentiation within the "herbicola" group. The extracellular polysaccharide elaborated by strain 403 was characterized by nuclear magnetic resonance spectroscopy and methylation analysis. Results showed it to be a typical bacterial lev
-
4. Erwinia herbicola isolates from alfalfa plants may play a role in nodulation of alfalfa by Rhizobium meliloti.
Erwinia herbicola was isolated from roots of plants derived from surface-sterilized seeds of all alfalfa varieties that were tested. Some of these E. herbicola strains affected nodulation by certain strains of Rhizobium meliloti. In previously published work we presented the isolation of slow-and fast-nodulating variants from a single culture of R. meliloti
-
5. Acceptance and transfer of R-factor RP1 by members of the "herbicola" group of the genus Erwinia.
The R-factor RP1 was transferred by conjugation from Pseudomonas aeruginosa PAO12r(RPI) to various strains of Erwinia herbicola and to one strain of Erwinia stewartii. The exconjugate strains had minimum inhibitory concentration values for carbenicillin, kanamycin, neomycin, and tetracycline somewhat lower than the corresponding values for the pseudomonad RP
-
6. Induction of Nonpigmented Variants of Erwinia herbicola by Incubation at Supraoptimal Temperatures
Several strains of Erwinia herbicola produce white variants at high frequency when grown in yeast beef broth at 37 C. The relationships of the variants of E. herbicola Y46 to the parent strain have been studied with respect to cultural, morphological, physiological and serological features. All the white variants are auxotrophic, showing a requirement for th
-
7. Functional Analysis of the Erwinia herbicola tutB Gene and Its Product
The tutB gene, which lies just downstream of tpl, has been cloned from Erwinia herbicola, and its product was analyzed. Despite its high sequence similarity to tryptophan transporters, TutB was found to be a tyrosine-specific transporter. Tryptophan acted as a competitive inhibitor of tyrosine transport. Unlike the tryptophanase operon, the tpl and tutB gene
American Society for Microbiology.
-
8. Release of cell-free ice nuclei by Erwinia herbicola.
Several ice-nucleating bacterial strains, including Erwinia herbicola, Pseudomonas fluorescens, and Pseudomonas syringae isolates, were examined for their ability to shed ice nuclei into the growth medium. Only E. herbicola isolates shed cell-free ice nuclei active at -2 to -10 degrees C. These cell-free nuclei exhibited a freezing spectrum similar to that o
-
9. Production of L-dihydroxyphenylalanine in Escherichia coli with the tyrosine phenol-lyase gene cloned from Erwinia herbicola.
The gene (tutA) encoding tyrosine phenol-lyase from Erwinia herbicola was cloned into Escherichia coli, and fusions to the lac and tac promoters were constructed. The enzyme was expressed at high levels in E. coli in the presence of isopropyl-beta-D-thiogalactopyranoside or lactose as an inducer. L-Dihydroxyphenylalanine was synthesized in high yield from ca
-
10. Plasmid-borne determinants of pigmentation and thiamine prototrophy in Erwinia herbicola.
Strains of Erwinia herbicola lost yellow pigmentation and thiamine prototrophy at high frequency when grown at elevated temperature (38 degrees C) or in the presence of sodium dodecyl sulfate. All pigmentless, thiamine-auxotrophic variants had lost a large plasmid (ca. 350 megadaltons). Conversely, all pigmented, thiamine-prototrophic strains contained the l
-
11. Transfer Among Erwinia spp. and Other Enterobacteria of Antibiotic Resistance Carried on R Factors
Antibiotic resistance carried on R factors was transferred by conjugation from Escherichia coli B/r and Shigella flexneri 1a to Erwinia spp. Tetracycline resistance (TetR) carried on R factor R100 drd-56 was transferred from E. coli B/r to strains of Erwinia amylovora, E. aroideae, E. atroseptica, E. chrysanthemi, E. cytolytica, E. dissolvens, E. herbicola,
-
12. Effect of Culture Conditions on the Production of Tyrosine Phenol-Lyase by Erwinia herbicola
The effect of environmental parameters on the growth and the tyrosine phenol-lyase content of Erwinia herbicola was investigated. On mineral medium containing glycerol, l-tyrosine increased the enzyme content 23-fold. When the l-tyrosine was also the carbon source, bacterial growth was 300 times greater than the basal level. On a rich medium, tyrosine phenol