Overproduction of an inducible extracellular serine protease improves biological control of Pythium ultimum by Stenotrophomonas maltophilia strain W81

Article Abstract:

Research reveals that the damping-off disease caused by Pythium ultimum can be controlled by biological means using Gram-negative bacteria Stenotrophomonas maltophilla strain W81. Data indicate that extracellularly produced bacterial serine protease protects the crop against the fungal infection.

United States, France, Ireland, Statistical Data Included, Analysis, Physiological aspects, Gene mutations, Gene mutation, Genetic aspects, Proteases, Enzymes, Fungi, Enzyme structure-activity relationships, Plants, Protection of, Plant protection

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Impact of 2,4-diacetylphloroglucinol-producing biocontrol strain Pseudomonas fluorescens F113 on intraspecific diversity of resident culturable fluorescent pseudomonads associated with the roots of field-grown sugar beet seedlings

Article Abstract:

Indigenous pseudomonads in soil appear to be fairly resistant to biocontrol strains of Pseudomonas fluorescens F113. The latter bacterium produces the antimicrobial secondary metabolite 2,4-diacetylphloroglucinol.

Antitoxins

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Biological suppression of potato ring rot by fluorescent pseudomonads

Article Abstract:

The ability of three fluorescent pseudomonad isolates (IS-1, IS-2 and IS-3) to suppress the growth of Clavibacter michiganenesis, which causes potato root rot, was assessed. Of the three isolated, IS-1 was the most inhibitory to C. michiganenesis, followed by IS-3, then IS-2. However, IS-1 was the only isolate capable of reducing potato ring rot infection. A concentration of 10(super 9) CFU per milliliter reduced ring rot infection by 23.4% to 26.7% after 5 tp 8 weeks. IS-1 and IS-2 was identified as Pseudomonas aureofaciens, while IS-3 was identified as P. fluorescens biovar III.

Potatoes, Diseases and pests, Root rots

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