• 한국식물병리학회:학술대회논문집
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• 한국식물병리학회 2003년도 정기총회 및 추계학술발표회
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• pp.77.2-78
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• 2003

An EREBP/AP2-type transcription factor (CaPFl) was isolated by DDRT-PCR following inoculation of soybean pustule pathogen Xanthomonas axonopodis pv. glycines Bra which induces HR on pepper leaves. Genomic Southern blot analysis revealed that the CaPFl gene is present as a single copy within the hot pepper genome. The deduced amino acid sequence of CaPFl has two potential nuclear localization signals, a possible acidic activation domain, and an EREBP/AP2 motif that could bind to a conserved cis- element present in promoter region of many stress-induced genes. The mRNA level of CaPFl was induced by both biotic and abiotic stresses. We observed higher-level transcripts in resistance-induced pepper tissues than diseased tissues. Expression of CaPFl is also induced upon various abiotic stresses including ethephon, MeJA, cold stress, drought stress and salt stress treatments. To study the role of CPFI in plant, transgenic Arabidopsis and tobacco plants which express higher level of pepper CaPFl were generated. Global gene expression analysis of transgenic Arabidopsis by cDNA microarray indicated that expression of CaPFl in transgenic plants affect the expression of quite a few GCC box and DRE/CRT box-containing genes. Furthermore, the transgenic Arabidopsis and tobacco plant, expressing CaPFl showed tolerance against freezing temperature and enhanced resistance to Pseudomonas syrnigae pv. tabaci. Taken together, these results indicated that CaPFl is a novel EREBP/AP2 transcription factor in hot pepper plant and it may has a significant role(s) in regulation of biotic and abiotic stresses in plant.

• 한국자원식물학회지
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• 제20권2호
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• pp.216-219
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• 2007

Root colonization by a rhizobacterium, Pseudomonas chlororaphis O6, elicited induced systemic resistance (ISR) in the leaves of cucumber plants against fungal and bacterial pathogens. To understand the role of unique genes during strain O6-mediated ISR, a suppressive subtractive hybridization method was undertaken and led to isolation of twenty-five distinct genes. The transcriptional levels of all the genes showed an increase much earlier under O6 treatment than in water control plants only after challenge with pathogen, while no difference detected on the plants without pathogen challenge. This suggests that O6-mediated ISR is associated with the priming phenomenon, an enhanced capacity for the rapid and effective activation of cellular defense responses after challenge inoculation.

• 식물병연구
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• 제11권2호
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• pp.162-166
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• 2005

차나무(Camellia sinensis O. Kuntze) 겹둥근무늬병의 발생소장을 2004년도 전남 보성군 보성읍 소재 전남농업기술원 보성차시험장에 식재되어 있는 야부기타 품종에서 조사하였다. 차나무 겹둥근무늬병은 6월말부터 발생하기 시작하여 7월말에 최대발병률을 나타내었다. 차나무의 엽권으로부터 차나무 겹둥근무늬병균에 대한 길항미생물을 분리하였으며, 차나무 겹둥근무늬병균에 대하여 가장 길항능력이 우수하고 차나무에는 병원성을 나타내지 않는 BD0310 균주를 겹둥근무늬병 방제용 길항미생물로 선발하였다. 선발된 균주는 배양적, 형태적, 생화학적 특성 조사와 16S rDNA염기서열 분석에 의하여 Bacillus subtilis 로 동정되었다.

• The Plant Pathology Journal
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• 제23권1호
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• pp.22-25
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• 2007

Biocontrol activity of five strains of selected rhizo-bacteria were tested in tomato against bacterial wilt caused by Ralstonia solanacearum. After root bacterization the plants were grown in a perlite-hydroponic system. Upon challenge inoculation with the pathogen, all of the rhizobacterial strains efficiently suppressed the bacterial wilt in tomato in various rates, at maximum by the strain, Bacillus vallismortis strain EXTN-1. While the percent of infected plants in the non-bacterized control plants were 95%, it was only 65% in plants pre-treated with EXTN-1. It was also demonstrated that the movement of R. solanacearum within the stem was significantly hampered when the plants were root bacterized. As EXTN-1 has no antagonistic properties against R. solanacearum, the bacterial wilt was probably suppressed by a mechanism other than antibiosis. Previously, the strain had been proven to produce an efficient elicitor for inducing systemic resistance in many crops. As the present study confirmed that EXTN-1 has the ability for reducing the pathogen spread in tomato, the strain could be effectively used as a potential biocontrol agent against bacterial wilt.

• 식물병연구
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• 제30권3호
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• pp.268-277
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• 2024

Erwinia pyrifoliae is a gram-negative bacterial pathogen that commonly causes black shoot blight in pear and apple tree. Although the pathogenicity of this bacterial species is very similar to E. amylovora, there is no specific explanation of its pathogenic genes and mechanisms. In this study, our investigation into E. pyrifoliae pathogenicity involved generating seven YKB12327 mutant strains using Tn5 transposon mutagenesis. Observations revealed weakened growth rate and loss of pathogenicity in these mutants. Whole-genome sequencing and alignment analysis identified transposon insertions within the coding sequences of five strains and in the intergenic region of two strains. Annotation analysis elucidated genes directly or indirectly associated with pathogenicity. Notably, mutant strain MT16 displayed a transposon insertion mutation in the cyclic-di-GMP phosphodiesterase (pdeF) gene, a key player in bacterial signaling, governing microbial behavior and adaptation to environmental changes. Our findings provide insights into the genetic regulation of E. pyrifoliae pathogenicity, suggesting potential avenues for further research aimed at understanding and controlling this bacterial pathogen by targeting pdeF to mitigate apple black shoot blight disease.

• 한국식물병리학회:학술대회논문집
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• 한국식물병리학회 1999년도 임시총회 및 추계 학술발표회
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• pp.30.2-30
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• 1999

• The Plant Pathology Journal
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• 제36권1호
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• pp.1-10
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• 2020

Since salicylic acid (SA) was discovered as an elicitor of tobacco plants inducing the resistance against Tobacco mosaic virus (TMV) in 1979, increasing reports suggest that SA indeed is a key plant hormone regulating plant immunity. In addition, recent studies indicate that SA can regulate many different responses, such as tolerance to abiotic stress, plant growth and development, and soil microbiome. In this review, we focused on the recent findings on SA's effects on resistance to biotic stresses in different plant-pathogen systems, tolerance to different abiotic stresses in different plants, plant growth and development, and soil microbiome. This allows us to discuss about the safe and practical use of SA as a plant defense activator and growth regulator. Crosstalk of SA with different plant hormones, such as abscisic acid, ethylene, jasmonic acid, and auxin in different stress and developmental conditions were also discussed.

• The Plant Pathology Journal
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• 제40권2호
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• pp.233-233
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• 2024

• 식물병연구
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• 제22권1호
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• pp.44-49
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• 2016

2015년 6월에 경북 문경시에서 재배하는 오미자에서 줄기마름증상이 발생하였다. 발병 초기에는 잎의 선단 부위부터 위축되면서 고사현상이 발생하였고, 병이 진행됨에 따라 줄기를 거쳐 식물체 전체가 고사하였으며 주변으로 전염되었다. 감염된 줄기에서 병원균을 분리배양하여 배양적, 형태적 특징을 관찰한 결과 해당 병원균은 Botryosphaeria속에 속하는 것으로 나타났으며, 인공접종에 의한 병원성 검정에서도 동일한 병징을 나타내었다. 병원균의 정확한 동정을 위해 ITS 영역과 ${\beta}$-tubulin, EF1-${\alpha}$ 유전자의 염기서열을 복합적으로 사용한 염기서열 분석을 수행하였으며, 분석 결과 오미자의 줄기마름 증상을 일으키는 원인균은 B. dothidea로 동정되었다. 지금까지 국내에서 B. dothidea에 의한 오미자의 병이 보고되지 않았기에 본 연구를 통해 국내 처음으로 B. dothidea에 의한 오미자 줄기마름병을 보고한다.

• The Plant Pathology Journal
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• 제25권2호
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• pp.193-198
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• 2009

A full-length cDNA of OgGRP gene encoding a glycinerich cell wall protein was isolated from wild rice (Oryza grandiglumis). Deduced amino acid sequences of OgGRP are composed of 148 amino acids (16.3 kDa), and show 85.9% homology with Osgrp-2 (Oryza sativa). RT-PCR analysis showed that RNA expression of OgGRP was regulated by defense-related signaling chemicals, such as cantharidin, endothall, jasmonic acid, wounding, or yeast extract treatment. In relation to pathogen stress, the function of OgGRP was analyzed in OgGRP over-expressing Arabidopsis thaliana. Overexpression of OgGRP in Arabidopsis contributed to moderate resistance against fungal pathogen, Botrytis cinerea, by lowering disease rate and necrosis size. In the analysis of the transgenic Arabidopsis lines to check the change of gene expression profile, induction of PR1, PR5 and PDF1.2 was confirmed. The induction seemed to be caused by the interaction of ectopic expression of OgGRP with SA-and JA-dependent signaling pathways.