• The Plant Pathology Journal
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• 제18권4호
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• pp.199-203
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• 2002

Soft rot occurred severely in onion bulbs stored under low temperature ($5^{\circ}C$) in storage houses at Changyoung, Kyungnam province, Korea in early 2000. Water-soaking and yellowish-brown lesions initially appeared on the outside scales of diseased onion bulbs, gradually progressing into the inside scales. Among the bacterial isolates obtained from the lesions, K-2 isolate was found to be responsible for the disease, which grew at a temperature range of from $0^{\circ}C$ to $36^{\circ}C$ with optimum temperature of $00^{\circ}$-$33^{\circ}C$. However, it showed strong pathogenicity to onion bulbs at $25^{\circ}C$ and $5^{\circ}C$ at 3 days and 2 months, respectively. The bacterium also caused soft rot on potato and showed hypersensitive reactions to tobacco and potato. The causal bacterium of onion soft rot was identified as Pseudomonas marginalis based on morphological, biochemical, and physiological characteristics including LOPAT, Soft rot in onion under low temperature storage caused by P. marginalis has not been previously reported.

• The Plant Pathology Journal
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• 제21권2호
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• pp.102-105
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• 2005

Severe wilt disease epidemic was found on winter daphnes (Daphne odora Thunb.) cultivated in farmers, nurseries in Suncheon, Jeonnam in 2003. Typical symptoms appeared on the leaves of winter daphne as yellowish wilts and turned brown from the lower leaves on the same plant. Severely infected leaves were defoliated, resulting in blight of stems and eventual death of the entire plant. Black decayed vascular tissues were distinctly observed in a wilted plant. Fusarium sp. was isolated from the diseased plants repeatedly and its pathogenicity was confirmed by artificial inoculation on healthy plants. The fungus was identified as Fusarium oxysporum on the basis of the morphological and cultural characteristics on potato dextrose agar and carnation leaf agar. The optimum temperature for fungal growth was around $25{\circ}C$ and the fungal growth was inhibited by metconazole, triflumizole and trifloxystrobin on potato dextrose agar. This is the first report on the wilt disease of winter daphnes caused by F.oxysporum in Korea.

• 한국식물병리학회지
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• 제12권3호
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• pp.358-362
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• 1996

감자 잎말림 바이러스를 검정하기 위하여 ELISA 및 전자현미경에 의해 바이러스 감염이 확인된 기내 배양중인 감장의 줄기로부터 RT-PCR 분석을 수행하였다. 분리된 총 RNA들로부터 바이러스 cDNA를 합성하고 감자 잎말림 바이러스 외피단백질의 일부인 465bp를 특이하게 증폭하도록 고안한 두 primer를 사용하여 PCR 반응을 하였다. 증폭된 465pb의 DNA 절편의 염기서열을 분석한 결과 역시 감자 잎말림 바이러스임을 확인하였다. 바이러스 검정에 있어서 EL-ISA 방법과 RT-PCR 방법간의 민감도를 조사한 결과 RT-PCR 방법간의 민감도를 조사한 결과 RT-PCR 방법이 ELISA 방법보다 감자 잎말림 바이러스검정에 있어서보다 정확한 방법인 것으로 사료된다.

• 한국자원식물학회지
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• 제10권4호
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• pp.300-304
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• 1997

저온관련 유전자인 H28 유전자를 갖고 있는 Agrobacterium MP90균주를 Desiree와 Atlantie 감자 품종의 잎절편과 공동배양한 후 약 6-8주 후에 항생제가 첨가된 선발배지에서 multiple shoots를 얻을수 있었다. 선발된 형질전환체를 대상으로 PCR 방법을 이용한 NPT II 유전자와 H28를 확인한 결과 내한성유전자가 식물체의 genome에 안정적으로 삽입되었음을 확인하였고 northern blot 확인에 의하여 내한성 유전자가 발현됨을 확인하였다.

• The Plant Pathology Journal
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• 제27권1호
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• pp.93-97
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• 2011

For quarantine purpose, we selected five plant RNA viruses including Cucumber vein yellowing virus (CVYV), Cucurbit yellow stunting disorder virus (CYSDV), Potato aucuba mosaic virus (PAMV), Potato yellow dwarf virus (PYDV), and Tomato chlorosis virus (ToCV), which are not reported in Korea and cause serious economic losses to the family Cucurbitaceae or Solanaceae. To detect those viruses, we employed RT-PCR technique with specific oligonucleotide primer pairs and tested their detection efficiency for each virus. To design RT-PCR primers, coat protein was used for CVYV, CYSDV, and ToCV whereas RNA polymerase and nucleocapsid regions were used for PAMV and PYDV, respectively. The development of an RT-PCR based method proved a useful tool for rapid detection and identification of quarantine virus infections.

• 원예과학기술지
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• 제19권3호
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• pp.329-333
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• 2001

감자의 품종육성의 초기세대에서 플러그 육묘 선발법을 이용하여 정식과정을 생략하고 플러그 내에서 직접 계통을 선발하는 방법과 숙기판별 효과를 구명코자 일련의 시험을 수행하였다. 감자의 실생육묘를 위하여 105공, 200공 및 288공 플러그 트레이가 사용되었다. 플러그 트레이에서의 종자발아율은 94- 96%로 높았다. 플러그 규격별 괴경착생률은 종자 파종 후 50일과 60일까지는 105공에서 가장 높았고, 70일에는 200공에서 가장 높았으나 288공의 플러그 트레이에서는 가장 낮았다. 그러므로 괴경착생이 빠른 조생개체의 선발을 위해서는 플러그의 크기가 큰 105공이 효과적인 것으로 생각된다. 한편, 감자육종 초기세대의 플러그 육묘단계에서 복지의 형태에 따른 조.만생 개체의 선발효과를 구명코자 복지의 길이에 따라 숙기를 구분하였다. 1세대인 유묘단계에서 복지가 짧은 그룹은 2세대인 괴경 선발단계에서도 대부분 조생종으로 나타났고, 반면 복지가 긴 그룹은 대부분 만생종으로 구분되었다. 이상의 결과를 통하여 볼 때 감자육종 초기세대에서 플러그 육묘법은 복지의 형태적 특성 구분이 용이하여 감자의 숙기관련 형질선발에 효과적인 것으로 판단되었다.

• 한국식물병리학회:학술대회논문집
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• 한국식물병리학회 2002년도 총회 및 추계학술발표회
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• pp.89.1-89
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• 2002

• 한국환경과학회지
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• 제30권12호
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• pp.1015-1025
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• 2021

Our research work aimed to evaluate cover crop effects of winter rye on soil characteristics, soil conservation, and yield productivities on potato fields with 15% slope during a fallowed period. There were two controls of bared field without any cultivation and conventional potato cultivation without winter rye. Potato cultivation increased soil pH, organic matter, available phosphate, and exchangeable cation regardless of cover crop cultivation. Sub-soil, particularly, all components of soil chemical properties showed higher value in winter rye cultivation than conventional cultivation. Higher soil density was observed on cover crop cultivation than conventional cultivation resulting from root residues of the cover crop both topsoil and subsoil. Cover crop residues positively affected plant growth and reduced the amount of soil erosion by holding the soil. Although severe soil erosion was seen in conventional cultivation, winter rye cultivation declined soil erosion by 47% during the fallow period on potato slope fields. Distinct soil bacterial communities were detected among treatments and some OTU(Operational Taxonomic Unit)s showed significantly higher abundance in winter rye treatment. Total yield and commercial rate demonstrated no significant differences while higher tuber phosphate, K⁺, and Mg²⁺ contents were observed in winter rye cultivation.

• 한국균학회지
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• 제32권1호
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• pp.45-49
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• 2004

2003년 4월부터 11월에 수집한 감자와 단호박 시료에 발생하는 진균을 조사한 결과, 지금까지 우리나라에서 발생기록이 없었던 Verticillium tenerum이 검출되었다. 이 균은 강원 평창과 전북 김제지역에서 수집한 감자괴경 시료와 연천지역에서 수집한 단호박 과실 및 종자 시료에서 검출되었다. V. tenerum의 분생포자경은 주로 $3{\sim}5$개의 피알라이드를 윤생으로 형성하였다. 피알라이드는 플라스크형으로 가늘었으며 무색이었고, 크기는 $10{\sim}26{\times}2{\sim}5\;{\mu}m$이었다. 분생포자는 난형 또는 장타원형으로 크기는 $2.5{\sim}7.5{\times}2{\sim}4\;{\mu}m$였고 slimy head를 형성하고 연한 적갈색을 띠었다. 그리고 감자와 호박 시료 위에 적갈색을 띠는 독특한 균총을 형성하였다.

• Journal of Plant Biotechnology
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• 제5권4호
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• pp.215-219
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• 2003

Optimal shoot regeneration and transformation conditions of root type chicory (Cichorium intybus L. var. sativus cv Cesare) were studied. Leaf explants were co-cultured with Agrobacterium tumefaciens, which contained NPTII as a selectable marker and a rice homeotic gene, OsMADS1, that encodes a MADS-domain-containing transcription factor. After one day of co-cultivation, explants were transferred to selection media consisting of MS basal medium supplemented with 0.5 mg/L BAP, 0.1 mg/L IAA, 70 mg/L kanamycin, and 250 mg/L cefotaxime. PCR and Southern blot analyses revealed stable integration of the OsMADS1 gene in the chicory genome. Four-teen original transgenic plants ($T_o$ plants) were acclimatized in the greenhouse and examined for their morphological characters. Most of the transgenic plants showed altered morphologies, such as short, bushy, and early-flowering phenotypes with reduced apical dominance. Additionally, half of the transgenic plants exhibited altered leaf shapes, and 4 out of 14 plants were sterile. These phenotypes were inherited by the next generation. Northern blot analysis confirmed expression of the OsMADS1 gene in both floral and vegetative organs.