• Title/Summary/Keyword: Cucumis melo var. makuwa

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Soft Rot on Cucumis melo var. makuwa Caused by Rhizopus oryzae

  • Kwon, Jin-Hyeuk;Kim, Jin-Woo;Lee, Yong-Hwan;Shim, Hong-Sik
    • Mycobiology
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    • v.38 no.4
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    • pp.336-338
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    • 2010
  • Rhizopus oryzae is reported for the first time on Cucumis melo L. var. makuwa Makino. A detailed description of this Korean specimen is given, along with its rDNA internal transcribed spacer sequence. On the basis of mycological characteristics and molecular data, the fungus was identified as R. oryzae Went & Prinsen Geerligs.

Effect of the ice pack treatment in the corrugated box for improving the storage quality of the oriental melon (Cucumis melo var. makuwa) at high temperature conditions during summer (여름철 고온 환경 조건에서 참외(Cucumis melo var. makuwa)의 저장 중 선도유지를 위한 아이스 팩 처리 포장 박스 적용 연구)

  • Choi, Woo Suk;Chung, Dae-Sung;Lee, Youn Suk
    • Food Science and Preservation
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    • v.21 no.1
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    • pp.25-33
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    • 2014
  • The effects of the ice pack and aluminum coated board in the corrugated boxes for maintaining the quality of fresh oriental melons (Cucumis melo var. makuwa) were investigated. The harvested oriental melons were stored at a temperature of $30^{\circ}C$ for 21 days after placing them in the corrugated boxes treated with control, including ice pack and aluminum coated board. The treatment with the ice pack and aluminum coated board was identified to have maintained the relative low temperature in the corrugated box against the high temperature from the environment. For the storage study of the oriental melon, the treatments with the ice pack and aluminum coated board reduced the respiration rate, the development of external color, and total weight loss. All treatments were also effective in maintaining the firmness and decreasing the decay ratio of the oriental melon as compared to those that were controlled. However, the value of total soluble solids regarding the fruit was insignificantly affected by the ice pack treatment. The results indicated that the application of the ice pack and aluminum coated board in the corrugated box played an important role in maintaining the quality of oriental melons during storage. The combination with the ice pack and aluminum coated board had more effective values on the storage qualities for oriental melons than that with the ice pack only. Based on the results of this study, the ice pack and aluminum coated board were the useful treatments for reducing the loss of quality of the fresh oriental melons in high temperature storage conditions.

Vegetative Compatibility Groups and Pathogenicity Variation among Isolates of Fusarium oxysporum f.sp. melonis

  • Ahn, Il-Pyung;Lee, Yong-Hwan
    • The Plant Pathology Journal
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    • v.16 no.4
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    • pp.227-230
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    • 2000
  • A total of 90 isolates of Fusarium oxysporum f.sp. melonis, the causal agent of oriental melon (Cucumis melo var. makuwa) wilt, was isolated from symptomatic tissues of oriental melon from 4 provinces in Korea. These isolates were grouped into vegetative compatibility groups (VCGs) by demonstrating heterokaryosis through complementation using nitrate nonutilizing (nit) mutants. No self-incompatibility was observed in any of isolates. All isolates were grouped into 3 VCGs ; A, B, and C. iSOLATES BELONGING TO VCG A and VCG B accounted for 87% and 91% of the fungal population collected in 1991 and 1993, respectively. As the increment of cultivation period in the same field, the proportion of isolates belonging to VCG B increased whereas that of isolates belonging to VCG A decreased. Mean virulence of a total population increased as the increment of cultivation period in the same field. Isolates belonging to VCG B showed the highest increment of virulence. These data suggest that replanting of a host plant in the same field may cause increase of virulence in the pathogens. Furthermore, virulence of F. oxysporum f.sp. melonis isolates is related to the VCGs.

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Hypoglycemic Activity of the Hexane Extract of Oriental Melon (Cucumis melo L. var. makuwa Makino) Seeds and Its Active Compounds

  • Chen, Lei;Kim, Hye Suk;Choi, Bo-Ram;Yang, Shaonan;Xu, Enning;Suh, Jun Kyu;Kang, Young-Hwa
    • Korean Journal of Plant Resources
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    • v.27 no.6
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    • pp.622-628
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    • 2014
  • The aim of this work is to evaluate the potential of oriental melon (Cucumis melo L. var. makuwa Makino) seeds for the management of type 2 diabetes by controlling glucose absorption. The ${\alpha}$-glucosidase and ${\alpha}$-amylase inhibitory effects of the hexane extracts from oriental melon seeds were investigated. A bioassay-guided fractionation technique was used to elucidate the principal active components. The results show that the hexane extract from oriental melon seeds exhibited high inhibitory activities against ${\alpha}$-glucosidase and ${\alpha}$-amylase. The hexane extract was further fractionated into four sub-fractions. Among them, the sub-fraction F-1 exhibited the most potent anti-diabetic effect. The active components were isolated and identified by gas chromatography/mass spectroscopy (GC-MS). Free fatty acids showed significant hypoglycemic activity (p < 0.001) and fatty acid composition influenced enzyme inhibitory activities. These results suggest that oriental melon seeds could be used to prevent type 2 diabetes.

Occurrence of Sclerotinia Rot on Cucurbitaceous Vegetable Crops in Greenhouses (온실재배 박과 채소작물에서의 균핵병 발생)

  • Kim, Wan-Gyu;Cho, Weon-Dae;Jee, Hyeong-Jin
    • The Korean Journal of Mycology
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    • v.27 no.3 s.90
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    • pp.198-205
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    • 1999
  • Cucurbitaceous vegetable crops grown in greenhouses in Korea were surveyed from 1995 to 1997. Incidence of Sclerotinia rot was as high as $30{\sim}70%$ at its maximum on Cucumis melo var. reticulatus (netted melon), Cucumis sativus (cucumber), Cucurbita moschata (pumpkin) and Cucurbita pepo (summer squash) but relatively low on Citrullus lanatus (watermelon) and Cucumis melo var. makuwa (oriental melon). Symptoms of Sclerotinia rot developed on stems of all the cucurbits, fruits of five cucurbits except C. lanatus, petioles of two Cucurbita spp. and leaves of C. moschata. A total of 126 isolates of Sclerotinia sp. were obtained from the lesions and identified as Sclerotinia sclerotiorum based on the morphological and cultural characteristics. The fungus was very frequently isolated from stems and fruits of the cucurbits but rarely from petioles and leaves. Six isolates of the fungus were pathogenic to six cucurbits tested although there was some difference in virulence among the isolates to some of the hosts. C. lanatus was the most susceptible to the isolates, whereas C. melo var. makuwa was the most resistant. C. melo var. reticulatus and C. sativus were relatively susceptible to the isolates, and C. moschata and C. pepo relatively resistant.

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Inhibition of Preharvest Drops by AVG Foliar Application in Staking Cultivation of Oriental Melon (Cucumis melo L. var. makuwa Mak.) Plants (AVG 처리(處理)에 의한 지주재배(支柱栽培) 참외의 낙과억제(落果抑制))

  • Chung, Hee-Don;Choi, Young-Jun;Ju, Sung-Don
    • Horticultural Science & Technology
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    • v.18 no.6
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    • pp.792-796
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    • 2000
  • The staking cultivation (SC) of oriental melon (Cucumis mela L. var. makuwa Mak.) produced more fruit yield than that of the conventional (creeping) growing. In the SC, preharvest fruit drop rate was high as 47.6% compared to 13.0% of the conventional cultivation. However, the foliar application of aminoethoxyvinylglycine (AVG, $100mg{\cdot}L^{-1}$) at 2 weeks after flowering (20 days before harvest) greatly reduced fruit drops up to 10.9% without causing any effects on ripening and quality of fruits . The AVG application markedly suppressed ethylene production in harvested fruits.

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