نتایج جستجو برای: pseudomonas fluorescens cha0

تعداد نتایج: 53246  

Journal: :Journal of bacteriology 2002
Theo H M Smits Stefanie B Balada Bernard Witholt Jan B van Beilen

We have cloned homologs of the Pseudomonas putida GPo1 alkane hydroxylase from Pseudomonas aeruginosa PAO1, Pseudomonas fluorescens CHA0, Alcanivorax borkumensis AP1, Mycobacterium tuberculosis H37Rv, and Prauserella rugosa NRRL B-2295. Sequence comparisons show that the level of protein sequence identity between the homologs is as low as 35%, and that the Pseudomonas alkane hydroxylases are as...

Journal: :Applied and environmental microbiology 2006
Alexandre Jousset Enrique Lara Luis G Wall Claudio Valverde

In soil ecosystems, bacteria must cope with predation activity, which is attributed mainly to protists. The development of antipredation strategies may help bacteria maintain higher populations and persist longer in the soil. We analyzed the interaction between the root-colonizing and biocontrol strain Pseudomonas fluorescens CHA0 and three different protist isolates (an amoeba, a flagellate, a...

Journal: :کنترل بیولوژیک آفات و بیماری های گیاهی 0
سمیه مختاری کارشناسی ارشد (مربی)، دانشگاه خلیج فارس نوازاله صاحبانی دانشیار، پردیس ابوریحان دانشگاه تهران حسن رضا اعتباریان استادیار، پردیس ابوریحان دانشگاه تهران

root-knot nematodes (meloidogyne spp.) are among the most important groups of plant-parasitic nematodes, causing damage and yield losses to most cultivated plants. the bacterium pseudomonas fluorescens cha0 and the fungus trichoderma harzianum bi were investigated for biological control capability and systemic induction of resistance against the nematode m. javanica under glasshouse conditions....

Journal: :Journal of bacteriology 2002
Stephan Heeb Caroline Blumer Dieter Haas

In Pseudomonas fluorescens CHA0, an antagonist of root-pathogenic fungi, the GacS/GacA two-component system tightly controls the expression of antifungal secondary metabolites and exoenzymes at a posttranscriptional level, involving the RNA-binding protein and global regulator of secondary metabolism RsmA. This protein was purified from P. fluorescens, and RNA bound to it was converted to cDNA,...

Journal: :Journal of general microbiology 1991
T Oberhänsli G Dfago D Haas

Pseudomonas fluorescens strain CHA0 is an effective biocontrol agent against soil-borne fungal plant pathogens. In this study, indole-3-acetic acid (IAA) biosynthesis in strain CHA0 was investigated. Two key enzyme activities were found to be involved: tryptophan side chain oxidase (TSO) and tryptophan transaminase. TSO was induced in the stationary growth phase. By fractionation of a cell extr...

Journal: :Applied and environmental microbiology 1997
J Troxler M Zala Y Moenne-Loccoz C Keel G Defago

The persistence of the biocontrol agent Pseudomonas fluorescens CHA0 in the surface horizon of 12 large outdoor lysimeters planted with winter wheat, Phacelia tanacetifolia followed by spring wheat, or maize was monitored for 1 year. Soil was inoculated with a spontaneous rifampin-resistant mutant (CHA0-Rif) of CHA0, and the strain was studied by using colony counts, Kogure's direct viable coun...

2011
Gunnar J. Henkes Alexandre Jousset Michael Bonkowski Michael R. Thorpe Stefan Scheu Arnaud Lanoue Ulrich Schurr Ursula S. R. Röse

Soil bacteria such as pseudomonads may reduce pathogen pressure for plants, both by activating plant defence mechanisms and by inhibiting pathogens directly due to the production of antibiotics. These effects are hard to distinguish under field conditions, impairing estimations of their relative contributions to plant health. A split-root system was set up with barley to quantify systemic and l...

Journal: :کشاورزی (منتشر نمی شود) 0
سمیه مختاری دانشجوی فارغ التحصیل کارشناسی ارشد، گروه حشره شناسی و بیماری های گیاهی، پردیس ابوریحان، دانشگاه تهران نوازاله صاحبانی استادیار، گروه حشره شناسی و بیماری های گیاهی، پردیس ابوریحان، دانشگاه تهران حسن رضا اعتباریان استاد بازنشسته، گروه حشره شناسی و بیماری های گیاهی، پردیس ابوریحان، دانشگاه تهران

biological control of root-knot nematode meloidogyne javanica by application of pseudomonas fluorescens cha0 was evaluated under greenhouse condition. results showed that p. fluorescens (109 cfuml-1) as shoot spray significantly reduced in no. of eggmass and egg per individual eggmass as comparison to control. application p. fluorescens as shoot spray induced systemic activation of peroxidase (...

Journal: :Applied and environmental microbiology 2006
Christophe Dubuis Joëlle Rolli Matthias Lutz Geneviève Défago Dieter Haas

In the biocontrol strain Pseudomonas fluorescens CHA0, the Gac/Rsm signal transduction pathway positively controls the synthesis of antifungal secondary metabolites and exoenzymes. In this way, the GacS/GacA two-component system determines the expression of three small regulatory RNAs (RsmX, RsmY, and RsmZ) in a process activated by the strain's own signal molecules, which are not related to N-...

Journal: :Systematic and applied microbiology 2011
Alban Ramette Michele Frapolli Marion Fischer-Le Saux C Gruffaz Jean-Marie Meyer Geneviève Défago Laurent Sutra Yvan Moënne-Loccoz

Fluorescent Pseudomonas strains producing the antimicrobial secondary metabolite 2,4-diacetylphloroglucinol (Phl) play a prominent role in the biocontrol of plant diseases. A subset of Phl-producing fluorescent Pseudomonas strains, which can additionally synthesize the antimicrobial compound pyoluteorin (Plt), appears to cluster separately from other fluorescent Pseudomonas spp. based on 16S rR...

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