• The Plant Pathology Journal
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• v.37 no.3
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• pp.205-214
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• 2021

The use of the supernatant from a Bacillus subtilis culture mixed with sodium bicarbonate was explored as a means of controlling stem brown spot disease in dragon fruit plants. In in vitro experiments, the B. subtilis supernatant used with sodium bicarbonate showed a strong inhibition effect on the growth of the fungus, Neoscytalidium dimidiatum, the agent causing stem brown spot disease and was notably effective in preventing fungal invasion of dragon fruit plant. This combination not only directly suppressed the growth of N. dimidiatum, but also indirectly affected the development of the disease by eliciting the dragon-fruit plant's defense response. Substantial levels of the pathogenesis-related proteins, chitinase and glucanase, and the phenylpropanoid biosynthetic pathway enzymes, peroxidase and phenyl alanine ammonia-lyase, were triggered. Significant lignin deposition was also detected in treated cladodes of injured dragon fruit plants in in vivo experiments. In summary, B. subtilis supernatant combined with sodium bicarbonate protected dragon fruit plant loss through stem brown spot disease during plant development in the field through pathogenic fungal inhibition and the induction of defense response mechanisms.

• Korean journal of applied entomology
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• v.52 no.1
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• pp.45-51
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• 2013

Tropical plants of mango(Mangefera indica), dragon fruit(Hylocereus undatus), and atemoya(Annona cherimola ${\times}$ A. squamosa) are cultivated in Jeju, Korea. A pest survey on those tropical fruits was conducted from 2008 to 2011. Major pests of Mango were thrips, aphid, mealybug, and lepidoptera species. Thrips palmi and Scirtothrips dorsalis were the most important pests in mango fields. T. palmi mainly injured the leaf but S. dorsalis injured the leaf and fruit. Lepidoptera mango pests injured leaves but some larva of Adoxophyes honmai injured fruit surface around the stem. Aphid pests, Aphis gossypii and Myzus persicae, injured the shoots and Pseudococcus kraunhiae occurred on the stem and fruit. Ant species, A. gossypii, and S. litura, were important pests on dragon fruit. Ants and aphid occurred and injured the stem, flower, and fruit. Spodoptera litura larva severely injured the stem. Among the atemoya pests, S. litura and Homona magnanima caused severe damage.

• Korean Journal of Plant Resources
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• v.28 no.4
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• pp.382-390
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• 2015

Momordica charantia L. is a valuable food and medicinal plant of the gourd family (Cucurbitaceae) that is cultivated in tropical and subtropical regions of the world. Physicochemical properties of M. charantia based on cultivars, parts and growing stage were investigated. Crude protein contents of leaf were 27.5%, 26.9%, and 23.6% in native leaf (NL), cv. Erabu leaf (EL), and cv. Dragon leaf (DL), respectively. In particular, the crude protein content was the highest in leaves. The crude fat content was in the order of developmental stage 1 of cv. Erabu fruit (EF1) and developmental stage 1 of native fruit (NF1) with values of 4.0%, and 3.9%, respectively. There was also high amount of crude fiber in stem of all three cultivars. The crude ash content was in the order of cv. Erabu leaf, cv. Dragon leaf, and developmental stage 3 of native fruit (NF3) with values of 23.2%, 17.4%, and 13.6%, respectively. The major minerals found in M. charantia were K, Ca, and Mg. The potassium contents of developmental stage 3 of native fruit (NF3), developmental stage 3 of cv. Dragon fruit (DF3), cv. Dragon stem (DS), and developmental stage 2 of native fruit (NF2) were 498.37, 339.21, 314.30, and 307.34 ㎎ /100g, respectively, while the calcium contents were decreased of EL, DL, and NL with values of 513.45, 371.69, and 209.43 ㎎/100g, respectively. The calcium content was higher in leaves and stems than fruits. On the otherhand, the highest magnesium content was measured in EL (69.92 ㎎/100g). The highest contents of chlorophyll a, chlorophyll b, and total chlorophyll were found in NL (442.9 ㎎/100g dw), EL (759.6 ㎎/100g dw), and EL (1164.9 ㎎/100g dw), respectively. The vitamin C contents from developmental stage 2 of cv. Erabu fruit (EF2), NF3, developmental stage 3 of cv. Erabu on fruit (EF3), and NF2 were found with values of 2849.9, 2330.5, 1985.1, and 1844.5 ㎎/㎏, respectively, and found to be higher in Korean cultivar and Erabu fruit than in Dragon. The charantin contents of leaf were higher than the fruit found to be 547.71, 506.04 and 395.62 ㎍/g dw in DL, EL and EF2, respectively. According to the results, mineral contents, total chlorophyll and charantin contents of M. charantia were higher in the leaves (EL and DL) than the fruits. And, vitamin C content was the highest in the fruit (EF2 and EF3). Therefore, much more research needs to be undertaken to use of the leaves as well as fruits. The data showed that M. charantia can be considered a good source of nutrient for application in food system.

• Animal Bioscience
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• v.34 no.4
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• pp.594-602
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• 2021

Objective: An experiment was conducted to assess the effect of dragon fruit peel pellet (DFPP) as a rumen enhancer of dry matter consumption, nutrient digestibilities, ruminal ecology, microbial protein synthesis and rumimal methane production in Holstein crossbred bulls. Methods: Four animals, with an average live-weight of 200±20 kg were randomly assigned in a 4×4 Latin square design to investigate the influence of DFPP supplementation. There were four different dietary treatments: without DFPP, and with 200, 300, and 400 g/h/d, respectively. Results: Results revealed that dry matter consumption of total intake, rice straw and concentrate were not significantly different among treatments (p>0.05). It was also found that ruminal pH was not different among treatments (p>0.05), whilst protozoal group was reduced when DFPP increased (p<0.01). Blood urea nitrogen and NH3-N concentrations were increased at 400 g of DFPP supplementation (p<0.01). Additionally, volatile fatty acid production of propionate was significantly enhanced by the DFPP supplementation (p<0.05), while production of methane was consequently decreased (p<0.05). Furthermore, microbial protein synthesis and urinary purine derivatives were remarkably increased especially at 400 g of DFPP supplementation (p<0.05). Conclusion: Plant secondary compounds or phytonutrients (PTN) containing saponins (SP) and condensed tannins (CT) have been reported to influence rumen fermentation. DFPP contains both CT and SP as a PTN. The addition of 400 g of DFPP resulted in improved rumen fermentation end-products especially propionate (C3) and microbial protein synthesis. Therefore, DFPP is a promising rumen enhancer and indicated a significant potential of DFPP as feedstuff for ruminant feed to mitigate rumen methane production.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.9
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• pp.269-282
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• 2020

This paper presents the scientific basis for the significance and physiological activity of gongyang as tributes, focusing on the four summer fruits, i.e., grapes, watermelons, oriental melons, and dragon fruits, which were used as one of the yukbeopgongyang in Yeongsanjae's thorough literature review (yeongsanjae and 2010.3~2020.2 published fruit research). As a result of the study, the fruit is not obtained from fruit trees, but from enlightenment. Chemically, the fruit had a high content of antioxidants, such as polyphenol and flavonoid. The fruit had excellent DPPH and ABTS+ radical scavenging activities and reducing power. The skin of the fruits, the non-edible part, had higher physiological activity than the flesh, the edible part. Therefore, further studies on the physiological activity in each part of dragon fruit and regarding how to ingest and utilize the peel of the four fruits need to be conducted.

• The Plant Pathology Journal
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• v.37 no.4
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• pp.413-413
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• 2021

• Proceedings of the Plant Resources Society of Korea Conference
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• 2018.10a
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• pp.79-79
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• 2018

용과(Hylocereus undatus)는 멕시코 및 과태말라가 원산지이며 아열대 및 열대지역에서 재배되고 있으며 아시아는 베트남 타이완 중국 일본 등 국가에서 재배하고 있다. 가지에 열매가 있는 모습이 용이 여의주를 물고 있는 형과 닮았다하여 붙여진 이름이다. 지구온난화로 인한 기온상승으로 전남지역 재배에 적합한 대체 열대 및 아열대과수 개발이 필요하다. 용과는 열대과수 중 비교적 낮은 온도($10^{\circ}C$이상) 조건에서 재배 가능하여 남부지역에서 시설내 가온재배하고 있다. 국내 시설재배 중 문제점은 용과는 밤에 꽃을 피기 때문에 밤에 활동하는 매개곤충이 없어서 인공수분으로 수분문제를 해결해야한다. 인공수분의 한계시간과 수분할 경우 과실비대에 미치는 영향을 알아보고자 인공수분 시간을 개화 1시간 이내, 4~5시, 11~12시 및 무 처리(방임)로 처리하였다. 개화시기는 1차 7월 13일, 2차 8월 8일, 3차 8월 26일로 3회에 걸쳐 개화가 이루어졌으며 이시기의 화분량는 4~5시가 0.68g, 11~12시 0.47g로 1시간 이내 0.16g보다 많았고 과실비대에서 1과중은 개화11~12시가 421g, 4~5시 400g, 1시간 이내가 377g으로 처리 간에 차이는 없었지만 무처리는 185g으로 처리구와 192~236g의 유의차가 있었다. 용과의 인공수분한계시간은 다음날 아침 7시(개화 11~12시)까지 인공수분 할 경우 정상적인 착과가 이루어졌으며 과실비대를 위해서 인공수분은 필수적으로 실시해야 한다.

• Horticultural Science & Technology
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• v.19 no.2
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• pp.149-152
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• 2001

Leaf chlorophyll fluorescence capable to estimate $CO_2$ assimilation was compared among three citrus rookstocks: trifoliate orange (Poncitrus trifoliate L.), 'Flying Dragon' (Poncitrus trifoliate L. var. monstrosa) and citromelo (Poncitrus trifoliate L.${\times}$Citrus paradisi), as well as among satsuma mandarin (Citrus unshiu cv. Nichinan No.1) grafted on the 3 rootstocks. Citromelo, the most vigorous rootstock; and 'trifoliate orange'; the most common cultivar and moderate rootstocks gave the same potential and actual quantum yields, whereas 'Flying Dragon' (very dwarf) had lower values due to a higher Fo and Fs for fluorescence obtained from dark-adapted and light-adapted leaves, respectively. These findings show that the absorbed photon energy was dissipated more as fluorescence from the antena chlorophyll in 'Flying Dragon' than trifoliate orange or 'swingle' citrimelo. The satsuma mandarins grafted on these rootstocks did not, however, show the differences observed in the rootstocks by having all the same potential and actual quantum yields. It is suggested that the rootsocks do not potentially or actually electron transport in the Photosystem II (PS II) of satsuma mandarin grafted on the 3 rootstocks.

• Food Science and Preservation
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• v.22 no.4
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• pp.577-584
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• 2015

The objective of this study was to investigate the antioxidant activity of imported tropical and subtropical fruits including dragon fruits, green kiwi, papaya, pineapple, pomegranate, and yellow mango. A seventy percent of ethanol extracts were prepared. Total phenolic content, DPPH (1,1-diphenyl-2-picryl hydrazyl)-, ABTS (2,2'-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid)), superoxide anion radical scavenging activity, FRAP (ferric reducing antioxidant power), tyrosinase inhibitory activity, and reducing power were investigated for the comparisons of antioxidant activities. The phenolic content expressed as gallic acid equivalents (GAE) was found to be highest in pomegranate (12.22 mg GAE/g), followed by pineapple (3.77 mg GAE/g). Pomegranate and pineapple exhibited higher antioxidant activity than those of other fruits except for FRAP. DPPH and ABTS radical scavenging activity from pomegranate were 93.00%, and 98.98%, respectively, at a concentration of 5 mg/mL, which were equal to those of ascorbic acid used for a positive control.

• Journal of the Korea Furniture Society
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• v.27 no.3
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• pp.185-196
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• 2016

This study is about watching the changes in Modern and Contemporary ages, through Traditional Ottchil Painting analyzed the formative characteristics presented on 23 pieces of Najeon Master Bong-Ryong Kim. He restored and reproduced the Ottchil Painting Technique by making Najeon ware (lacquer ware inlaid with the mother-of-pearl) on the Korean Modern and Contemporary period. The formative characteristics of his Ottchil Painting Technique are as follows. He used a lot of the Myochilchaehoi Technique as the technique of expression, along with the Najeon Yanggam Technique mixed with Myochilchaehoi Technique. The frame material of Ottchil Painting Ware is handcrafted wood. And in the painting foundation, red is presented more than black. The colors of painting and the pattern drawn on the foundation of Ottchil painting are mainly bright red, blue, yellow, black, and white (five-color). The main pattern used is the dragon, and the subordinate patterns are clouds and Arabesque. Also, the main pattern is solo, and the subordinate pattern is mostly an arrangement combination of radiation symmetry. This style of art was most commonly used for painting fruit trays. As stated above, Bong-Ryong Kim presented various and masterful aesthetic quality based on sincere and exquisite Najeon ware production skills.