First report in South Korea of a bacterial leaf blight of oats caused by Pseudomonas salomonii.

In March 2020, approximately 20% of leaves in a commercial oat field growing Avena sativa (cv. Samhan) in Jeongeup, Korea (35.3859°, 126.

Biocontrol Efficacy of Formulated O6 against Plant Diseases and Root-Knot Nematodes.

Commercial biocontrol of microbial plant diseases and plant pests, such as nematodes, requires field-effective formulations. The isolate O6 is a Gram-negative bacterium that controls microbial plant pathogens both directly and indirectly. This bacterium also has nematocidal activity.

Biological Control Potential of Bacillus amyloliquefaciens KB3 Isolated from the Feces of Allomyrina dichotoma Larvae.

Most biocontrol agents for plant diseases have been isolated from sources such as soils and plants. As an alternative source, we examined the feces of tertiary larvae of the herbivorous rhino beetle, Allomyrina dichotoma for presence of biocontrol-active microbes. The initial screen was performed to detect antifungal activity against two common fungal plant pathogens.

The dctA gene of Pseudomonas chlororaphis O6 is under RpoN control and is required for effective root colonization and induction of systemic resistance.

Transcription from the dctA gene, which encodes an organic acid transporter in the root-colonizing bacterium Pseudomonas chlororaphis O6, is under complex regulatory control. Promoter sequence analysis revealed an RpoN binding site. The regulation of transcript accumulation by the level of ammonium ions in the growth medium confirmed RpoN regulation, even in the presence of glucose.

Transcriptional regulation and mutational analysis of a dctA gene encoding an organic acid transporter protein from Pseudomonas chlororaphis O6.

A dctA gene encoding a protein with identity to a C(4)-dicarboxylic acid/H(+) symporter was cloned from a beneficial root colonizer, Pseudomonas chlororaphis O6 (PcO6). Expression of the dctA gene was induced in minimal medium by several organic acids and was repressed by glucose. Highest expression was observed in early-logarithmic (log) cells grown on fumarate, acetate or succinate with decline as cells approached late-log growth phase.