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Inhibitory Effects of Super Reductive Water on Plant Pathogenic Fungi
Jae-SeounHur,Hae-JinKim,Soon-OkOh,YoungJinKoh,Young-SeKwak,ChoongIlLee 한국식물병리학회 2002 Plant Pathology Journal Vol.18 No.5
The antifungal activity of super reductive water (SRW) against plant pathogenic fungi was examined to extend its application to integrated pest management (IPM) for plant diseases. Diluted solutions (×1/10, ×1/25, and ×1/50) of SRW inhibited fungal growth of kiwifruit soft rot pathogen, Diaporthe actinidiae, in a concentration dependent manner. When kiwifruits were inoculated on wounds with mycelium blocks, stock and diluted solutions successfully inhibited the disease development. In addition to the high pH of the SRW, fungistatic activity was also considered as the cause of the antifungal effect against the pathogen. Whereas conidial germination of Magnaporthe grisea was not affected by the diluted SRW solutions, appressorium formation was significantly inhibited in a concentration dependent manner. With little harmfulness to human health and environment, SRW could be used to control plant pathogenic fungi, particularly appressorium-forming fungal pathogens.
HyoShimHan,HyeYoungNam,YoungJinKoh,Jae-SeounHur,JaeSungJung 한국미생물학회 2003 The journal of microbiology Vol.41 No.1
We have collected eight high-level streptomycin-resistant strains of Pseudomonas marginalis and P. syringae pv. actinidiae which were isolated from kiwifruit orchards in Korea and Japan. The molecular mechanisms of resistance were investigated by the PCR, susceptibility tests, and nucleotide sequence analysis. Of the eight high-level streptomycin-resistant strains, four harbored strA-strB genes, which encode streptomycin-inactivating enzymes. While the three Korean strains of P. marginalis did not have plasmid and carried the resistant genes in the chromosomes, the Japanese strain of P. syringae pv. actinidiae had a plasmid containing strA-strB genes. The myomycin susceptibility test demonstrated that the high-level resistance to streptomycin of the remaining four strains is associated with mutations in the rpsL gene. Nucleotide sequence analyses revealed that they contain a single base-pair mutation in codon 43 of their rpsL gene.