• 인간식물환경학회지
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• 제23권2호
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• pp.171-178
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• 2020

The present study was conducted to determine the effects of electron beam irradiation on the postharvest quality of cut flowers. Cut flowers were irradiated with electron beam at 100, 200, 400, 600, 800, 1,000, and 2,000 Gy with a 10 MeV linear electron beam accelerator to evaluate their irradiation tolerance. Postharvest quality was determined by monitoring fresh weight loss, flower longevity, flower diameter, flowering rate, visual quality of flowers and leaves, and chlorophyll content. Cut flowers showed a radiation-induced damage with increasing the irradiation dose. Flower longevity and fresh weight of cut flowers decreased when the irradiation dose was increased. Flower bud opening was also inhibited in a dose-dependent manner. The effective irradiation doses for 10% reduction of postharvest quality (ED₁₀) values were 144.4, 451.6, and 841.2 Gy in the 'Medusa' lily, 'Montezuma' carnation, and 'Rosina White' eustoma, respectively. Although tolerance of cut flowers to electron beam irradiation vary according to species, cultivars, or maturity stage conditions, it is conceivable that 'Montezuma' carnation and 'Rosina White' eustoma could be tolerated and maintained overall postharvest quality up to 400 Gy, the generic irradiation dose approved by the Animal and Plant Health Inspection Service (APHIS) and the International Plant Protection Convention (IPPC) for postharvest phytosanitary treatments.

• Mycobiology
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• 제39권1호
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• pp.52-53
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• 2011

Gray mold of blueberry caused by Botrytis sp. is reported for the first time in Korea. A detailed description of the fungus is given, along with its rDNA internal transcribed spacer sequence. The fungus was identified as Botrytis cinerea based on mycological characteristics and molecular data.

• 식물조직배양학회지
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• 제27권4호
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• pp.345-352
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• 2000

Food production is a major role of agriculture. It has been projected that the world population continues to increase by the middle of the 21st century, and the population growth results in raising a serious problem of food shortage. Thus we have to increase food as possible. A considerable amount of crops have been abandoned due to short-life after postharvest. Ethylene is a factor responsible for the postharvest loss in crops, especially horticultural crops. If we can reduce ethylene production or sensitivity by genetic engineering, we can develop, so called,“long-life crop”conferring long postharvest lives. During last two decades, intensive research for molecular dissection of ethylene biosynthesis has been carried out, and the researchers have succeeded in engineering ethylene productivity in some crops. On the other hand, after the successful isolation of Arabidopsis ethylene receptor gene ETR1, the homolog genes have been isolated in various plant species. Currently the characterization of these genes and alteration of ethylene sensitivity using the genes are in progress. This review summarizes current progress in the analysis of these genes, and discusses genetic engineering of ethylene sensitivity using these genes.

• 식물병연구
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• 제17권2호
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• pp.232-234
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• 2011

During survey of postharvest diseases of vegetables in the middle region of Korea in 2003, 2004 and 2005, new disease symptoms showing watery rot and soft rot were observed. In this study, the disease causal agents were identified as Geotrichum candidum, and their host range and pathogenicity were investigated. G. candidum isolated had wide host range and strong pathogenicity against carrot, cucumber, tomato and pumpkin. The disease occurrence on several vegetables that G. candidum can be a serious threat to stable production of fresh vegetable.

• 농업과학연구
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• 제25권1호
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• pp.19-25
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• 1998

조생종 '쓰가루' 사과의 단기저장 중 품질유지를 위한 몇 가지 수확후 처리 효과를 살펴 출하시기조절을 위한 방안을 마련하고자 하였다. 저장한 과실의 품질은 수확후 처리보다는 숙기에 많은 영향을 받았다. 경도 및 내적 품질을 고려하였을 때 착색정도가 중간 단계인 과실이 저장에 유리하였다. 수확후 처리 중 단순 PE포장은 증산억제에 따른 무게감량 방지에 효과적이었으나 기타의 품질에 대한 효과는 뚜렷하지 않았다. 그러나 에틸렌제거제 포장처리는 과실품질 유지에 긍정적인 효과를 보여주었다. 특히 산 함량이 높게 유지되어 과실은 더욱 신선하였다. 본 연구 수행 중 $0-1^{\circ}C$ 저장온도에서 생리적 장해가 주로 악편부위에 발생하였으며 미숙한 상태의 과실일수록 그 정도가 심하였다. 증상은 부정형의 작은 반점이 형성되었으며 반점부위의 표피조직은 함몰되었는데 일부 과실은 수침증상의 반점이 비교적 크게 형성되기도 하였다. 따라서 앞으로의 연구에서는 '쓰가루' 사과의 적정 저장온도에 대한 보다 세밀한 검토가 필요하였다.

• 농업과학연구
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• 제39권1호
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• pp.1-8
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• 2012

Rapid loss of grape berry quality after harvest occurs due to poor postharvest management. Understanding physiological properties between cultivars is required to develop practical technologies to control fast quality deterioration of tables grapes. Physiological characteristics of whole cluster, rachis and berries were examined to find their effects on postharvest behaviour of table grapes. 'Tamnara' showed high respiration rate and browning of rachis compared to 'Campbell Early'. Weight loss of rachis of 'Cheongsoo' was highest of three cultivars. Berry decay in 'Cheongsoo' begins at the connection portion between peduncle and berry, and berry decay of 'Cheongsoo' was the most severe among three cultivars. Precooling at $0^{\circ}C$ showed better results than cooling at $10^{\circ}C$ regardless of cultivars but cooling effect decreased when simulated marketing period increased up to 10 days. Plastic film wrapping was effective on reducing decay in general but not at higher marketing temperature. For successful commercialization of newly developed grapes, the inhibition technology of rachis browning in 'Tamnara' is required and decay control in 'Cheongsoo' through establishment of cold chain system is recommended.

• The Plant Pathology Journal
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• 제36권2호
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• pp.133-147
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• 2020

Hexanal, a C-6 aldehyde has been implicated to have antimicrobial properties. Hence, this study was conducted to determine the antifungal activities of hexanal vapor against major postharvest pathogens of banana viz., Colletotrichum gloeosporioides and Lasiodiplodia theobromae. The pathogens were cultured in vitro and exposed to hexanal vapor at 600, 800, 1,000 and 1,200 ppm. Mycelial growth of both fungal pathogens were inhibited completely at 800 ppm and the incidence of anthracnose and stem-end rot diseases reduced by 75.2% and 80.2%, respectively. The activities of peroxidase, polyphenol oxidase, phenylalanine ammonia-lyase and glucanase had transiently increased in hexanal vapor treated banana by 5 to 7 days and declined thereafter. Postharvest treatment of banana with hexanal vapor resulted in phospholipase D inhibition and also resulted in cell wall thickening of the treated fruit, which impeded the penetration of the pathogenic spores. This was further confirmed by scanning electron micrographs. The defense-related protein intermediaries had increased in hexanal vapor treated banana fruit, which suggests induced resistance against C. gloeosporioides and L. theobromae, via., the phenylpropanoid pathway which plays a significant role in hindering the pathogen quiescence. Delayed ripening due to inhibition of phospholipase D enzyme, inhibition of mycelial growth and induced systemic resistance by defense enzymes collectively contributed to the postharvest disease reduction and extended shelf life of fruit.

• 한국환경농학회지
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• 제15권4호
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• pp.434-441
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• 1996

저장중인 사과에 발생하는 병해를 방지하기 위하여 postharvest 약제로서 benomyl과 bitertanol을 사과에 처리한 후 CA 및 저온저장시켜 저장중 약제의 분해양상, 잔류량의 변화 및 약제의 안전성 평가 그리고 약제의 사과 내로의 침투율을 조사하였다. CA저장에서 약제의 분해양상은 사과의 저장 초기에는 느린 속도로 분해되나 저장 후반기로 갈수록 빠르게 분해되며, 저온저장에서는 이와는 반대로 저장 후기보다 초기에 빠른 분해양상이 나타났다. Benomyl과 bitertanol이 표준살포농도로 처리된 사과에서의 초기농도는 2.24 및 1.54mg/kg으로 나타났으며, CA저장에서는 저장후 135 및 96일, 저온저장에서는 115 및 70일에 MRL인 1mg/kg에 이르렀다. Benomyl과 bitertanol의 분해반감기는 CA저장에서 124 및 130일이고, 저온저장에서는 101 및 111일로 나타나서 CA저장보다는 저온저장에서 보다 더 빠른 분해가 이루어졌다. Benomyl과 bitertanol이 처리된 사과에서의 침투율을 조사한 결과 두 약제 모두 과육부보다는 과피에 주로 잔류되어 있었다.

• 분석과학
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• 제12권6호
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• pp.534-539
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• 1999

Penicillium, Aspergillus 및 Fusarium에 오염된 밀(Triticum aestivum L.), 콩(Glycine max Merr), 옥수수(Zea mays L.)에서 HPLC를 이용하여 주요 독소들을 검정하였다. Penicillium 독소인 brefeldin A는 밀에서 3.1~270 ppm, 콩에서 45~230 ppm, 옥수수에서 1030~1240 ppm 다량 검출되었다. Citreoviridin과 griseofulvin은 밀, 콩, 옥수수에서 각각 40~80 ppm과 3.6~26.0 ppm이 검출되었다. 그리고 citrinin과 patulin은 밀, 콩, 옥수수에서 각각 0.3~4.0 ppm과 420~3800 ppm로 검출되었고, 특히 옥수수에서 다량 검출되었다. Aspergillus 독소로 ochratoxin A는 밀에서 730 ppm, 콩에서 12.4 ppm, 옥수수는 310 ppm이 검출되었다.

• 한국식품저장유통학회:학술대회논문집
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• 한국식품저장유통학회 2007년도 학술발표회
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• pp.239.2-239.2
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• 2007