• 식물병연구
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• 제29권3호
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• pp.310-315
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• 2023

In May 2021, characteristic soft rot symptoms, including soft, watery, slimy, black rot, wilting, and leaf collapse, were observed on melon plants (Cucumis melo) in Gokseong, Jeollanam-do, Korea. A bacterial strain, designated KNUB-06-21, was isolated from infected plant samples, taxonomically classified, and phylogenetically analyzed using 16S rRNA and housekeeping gene sequencing. Strain KNUB-06-21 was also examined for compound utilization using the API ID 32 GN system and strain KNUB-06-21 was identified as Pectobacterium brasiliense. Subsequent melon stem inoculation studies using strain KNUB-06-21 showed soft rot symptoms similar to field plants. Re-isolated strains shared phenotypic and molecular characteristics with the original P. brasiliense KNUB-06-21 strain. To our knowledge, ours is the first report of P. brasiliense causing melon soft rot disease in Korea.

• 식물병연구
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• 제29권4호
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• pp.399-404
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• 2023

Agricultural activities and the number of farms in the subarctic regions have been increasing annually after the coronavirus disease 2019 pandemic to achieve food self-sufficiency. Potatoes are vulnerable to soft rot bacteria at all stages of production, storage, and transportation. A novel bacterium, Pseudomonas sp. N3-W, isolated from Alaska tundra soil, grows at 5-25℃ and produces extracellular protease(s). N3-W caused necrotic spots (hypersensitivity) in hot pepper leaves and soft rot disease (pathogenicity) in potato tubers. The psychrotolerant N3-W caused significant soft rot symptoms on potatoes at a broad temperature range (5℃, 15℃, and 25℃). In contrast, mesophilic Pectobacterium carotovorum KACC 16999 induced severe rotting symptoms in potatoes at their optimal growth temperature of 15℃ and 25℃. However, it barely produced symptoms at 5℃, which is the appropriate storage and transportation temperature for potatoes. The results of pathogenicity testing imply that psychrotolerant soft rot pathogens from polar regions may cause severe soft rot not only during the crop growing season but also during storage and transportation. Our study indicates the possibility of new plant pathogen emergence and transmission due to the expansion of crop cultivation areas caused by permafrost thawing in response to recent polar warming.

• 식물병과 농업
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• 제5권1호
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• pp.61-63
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• 1999

Bacterial soft rot was observed on radish grown in Hongcheon, Kanwon-Do, Korea. The soft rot symptoms began as small water-soaked lesions. The water-soaked lesions enlarged rapidly in roots and produced a foul odor. When roots were affected in the field, the shoots also became infected and watery, causing infected plants to wilt, disorganize, and die. The causal organism was isolated from the lesions, and the identified as Erwinia chrysanthemi based on the morphological, physiological and biochemical characteristics. E. chrysanthemi is first described bacterium which causes bacterial soft rot on radish in Korea.

• 한국식품위생안전성학회지
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• 제37권2호
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• pp.55-62
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• 2022

세균성 무름병은 배추와 같은 채소의 주요 질병중의 하나이며, 특히 김치의 주원료인 배추의 저장에 있어서 발생할 경우, 품질 저하로 인한 경제적 손실을 유발한다. 우리는 무름병이 발생한 배추로부터 원인이 되는 세균들을 분리하였고, 해당 세균이 신선한 배추 조직에 인위적으로 접종하였을 경우, 무름병이 발생하는 것을 확인하였다. 해당 원인균 2종을 동정한 결과, Pseudomonas kribbensis와 Pantoea vagans로 확인되었다. 이러한 원인 세균을 제어하기 위하여 차아염소산수 처리와 항균활성 유산균의 배양 상등액을 이용하여 제어하는 테스트를 진행하였다. 본 테스트에 사용한 항균활성 유산균은 리스테리아와 같은 병원성 미생물과 Pseudomonas 속 계열을 저해하는 Lactobacillus plantarum PL203 유산균을 선별하여 사용하였다. 제어 테스트는 정상 배추 조직에 무름병 원인균 2종을 각각 10⁵ cfu/g 이 되도록 접종한 후, 차아염소산수를 농도별로 분무하거나 항균활성 유산균 배양상등액을 0.5 mL 분무한 후, 25℃에서 5일간 배양한 결과, 차아염소산수 120 ppm 이상 첨가한 구간과 항균활성 유산균 배양 상등액을 처리한 구간에서 대조구와 비교하여 배추 무름 원인세균을 완전하게 제어하는 것을 확인하였다.

• 한국식물병리학회지
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• 제14권4호
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• pp.361-363
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• 1998

Occurrence of soft rots was observed on celery that was massively grown in Pyungchang, Kangwon-Do, Korea. Soft rot symptom appeared first on the lower parts of the celery which eventually extended into whole aboveground parts of it. The casual organism isolated from the infected lesions was identified as Erwinia carotovora subsp. carotovora based on the physiological and chemical characteristics, and on the results of the Biolog program (Biolog Inc., U. S. A.). E. carotovora subsp. carotovora is the first described bacterium which causes the bacterial soft rot disease on celery in Korea.

• 식물병연구
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• 제6권1호
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• pp.15-18
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• 2000

1998년 대전의 비닐하우스에서 재배중인 칼란코에의 잎에 세균병이발생하였다. 이들 병반은 수침상 병반이 나타나고 병반진전과 함께 무름증상을 보였다. 이들로부터 분리한 병원세균을 침접종한 결과 자연병징과 같은 병반을 형성하였다. 병원세균의 세균학적 특성을 조사한 결과 E. herhicola로 동정되었다. 국내에서는 아직 칼란코에 (Kalanchoe blossfeldiana)의 병원세균으로 E. herbicola가 보고되지 않았다. 따라서 이를 E. herbicola에 의한 \"칼란코에의 세균성 무름병\"으로 명명할 것을 제안한다.할 것을 제안한다.

• 식물병연구
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• 제10권1호
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• pp.82-85
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• 2004

Erwinia carotovora subsp. carotovora에 의한 배추 무름병은 배추에서 가장 큰 문제가 되고 있는 병 중 하나이다. 본 연구는 칼슘비료 시비가 배추 무름병 발생에 미치는 영향을 조사하기 위하여 실시하였다 칼슘 비료 7종을 선발하여 배추 유묘에 엽면 살포한 후, 세균현탁액과 mineral oil을 4:1로 혼합하여 배추의 중앙 기부에 10 m1 관주 접종하는 mineral oil 접종법으로 접종하였다. 배추 유묘에 엽면 살포한 결과 calcium hydroxide가 다른 calcium 비료보다 무름병 방제에 효과가 높게 나타났다. 질소 비료시비는 무름병 발생을 촉진한 반면, calcium hydroxide를 수용액으로 엽면시비할 때 유묘에서뿐 아니라 포장 시험에서도 무름병 발생을 억제하였다. Calcium과 질소를 혼합 살포할 때도 calcium 단독살포와 마찬가지로 무름병 발생을 억제하였다.

• 한국식물병리학회지
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• 제12권1호
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• pp.116-120
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• 1996

안동지방의 하우스메론 재배농장에서 메론의 과일 및 줄기에 수침상 병반이 관찰되었다. 이 병이 진전되면서 식물의 조직을 연부시키고, 마침내 식물 전체가 말라죽는다. 수침상병반에서 분리된 병원세균의 병원성과 형태적·생리적 특성을 조사한 결과, Erwinia carotovora subsp. carotovora로 동정되었다. 이 병원세균은 국내에서 시판되고 있는 농용항생제 2종과 의약용 항생제 2종에 대해 모두 감수성이었다. 이 병은 한국에서 처음 보고된 것이기에, 병명을 "메론이 세균성무름병(bacterial soft rot of melon)"이라고 부를 것을 제안한다.

• 한국식물병리학회지
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• 제3권3호
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• pp.236-238
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• 1987

A bacterial disease of elephant foot, Hydrosome rivieri Engl., was newly found in Taejon, Korea in August 1986. The affected plants showed symptoms of soft rot on leaf blades and petioles. Bacterial isolates from affected plants found to be pathogenic to elephant foots by antificial inoculation, producing similar symptoms with those produced naturally. The baterium was also pathogenic to carrot, Chinese cabbage, radish, potato and onion, and developed symptom of soft root on them. On the basis of bacteriological characteristics and pathogenicity, tested bacterium was identified as Erwinia carotovora subsp. carotovora and this disease was proposed to name 'Bacterial soft rot of elephant foot'.

• 식물병연구
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• 제21권4호
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• pp.255-260
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• 2015

We investigated influence of three commercial antibiotics viz., oxolinic acid, streptomycin, and validamycin A, on biocontrol and plant growth promoting activities of Bacillus vallismortis EXTN-1 and BS07M in Chinese cabbage. Plants were pre-drenched with these strains followed by antibiotics application at recommended and ten-fold diluted concentration to test the effect on biocontrol ability against soft rot caused by Pectobacterium carotovorum SCC1. The viability of the two biocontrol strains and bacterial pathogen SCC1 was significantly reduced by oxolinic acid and streptomycin in vitro assay, but not by validamycin A. In plant trials, strains EXTN-1 and BS07M controlled soft rot in Chinese cabbage, and there was a significant difference in disease severity when the antibiotics were applied to the plants drenched with the two biocontrol agents. Additional foliar applications of oxolinic acid and streptomycin reduced the disease irrespective of pre-drench treatment of the PGPRs. However, when the plants were pre-drenched with EXTN-1 followed by spray of validamycin A at recommended concentration, soft rot significantly reduced compared to untreated control. Similarly, strains EXTN-1 and BS07M significantly enhanced plant growth, but it did not show synergistic effect with additional spray of antibiotics. Populations of the EXTN-1 or BS07M in the rhizosphere of plants sprayed with antibiotics were significantly affected as compared to control. Taken together, our results suggest that the three antibiotics used for soft rot control in Chinese cabbage could affect bacterial mediated biocontrol and plant growth promoting activities. Therefore, combined treatment of the PGPRs and the commercial antibiotics should be carefully applied to sustain environmental friendly disease management.