• Korean journal of applied entomology
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• v.52 no.1
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• pp.1-4
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• 2013

Acrolepiopsis nagaimo (Yasuda, 2000) belonging to the family Acrolepiidae (Lepidoptera) is newly reported from Korea. The species was first collected at Gimcheon-si in 2003 and later they were found to infest Chinese yam, Dioscorea batatas at a Chinese yam experimental field of the Institute for Bioresources Research located at Andong in 2008. Diagnostic characteristics of the adult are described and photographs of adult and male and female genitalia are provided.

• Korean Journal of Medicinal Crop Science
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• v.6 no.1
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• pp.33-37
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• 1998

Browning index rised rapidly within 15 hrs to 83% of total browning in Jang - ma (Dioscorea batatas Decne) tissues at $40^{\circ}C$ while 37% in Dan - ma. Therefore, the degree of browning process of Jang - ma was faster than that of Dan - ma. Browning in Jang - ma was inhibited by treatments of NaCl which showed 48 and 39% inhibition, respectively, after 48 hrs of incubation. Also the treatment of $80^{\circ}C$ heating showed excellent inhibition within 24 hrs. In the case of Dan - ma, browning process was inhibited by treatments of 1 and 0.5M NaCl and $70^{\circ}C$ heating, which showed 43, 26 and 23% inhibition, respectively, after 48 hrs of incubation.

• Journal of Life Science
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• v.34 no.3
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• pp.153-159
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• 2024

Dioscorea alata L, commonly known as "tropical yam" is the most widely consumed yam species among the 650 yam species belonging to the Dioscoreacea family. It is extensively cultivated in tropical and subtropical regions and is a major food source in Africa and India. Also, it is used for medicinal purposes, particularly in China and Taiwan, for its anti-inflammatory properties. In comparison to other yam varieties such as D. batatas or D. opposita, the tropical yam has gained popularity in Korea due to its higher yield per unit area. In this study, the nutritional characteristics and anti-thrombosis activity of the aerial bulbils of D. alata L. tropical yam were compared to those of D. opposita. The results showed that the aerial bulbils of tropical yam exhibited nutritional characteristics and potent anticoagulant activity compared to those of domestic yam varieties. The bulbils extract of tropical yam showed superior anticoagulant activities against thrombin, prothrombin and blood coagulation factors. Furthermore, the bulbils extract of tropical yam exhibited strong platelet aggregation inhibition at 0.25 mg/ml and showed no hemolytic activity up to a concentration of 2.5 mg/ml. These findings suggest the potential development of high-value anti-thrombosis agents utilizing the aerial bulbils of tropical yam.

• Korean Journal of Medicinal Crop Science
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• v.7 no.3
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• pp.167-171
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• 1999

This experiment was conducted to determine effects of trenching depth on characteristics and yield of tubers in Chinese yam (Dioscorea opposita Thunb). Self-propelled trencher, ‘NF-827H’ produced by KAWABE company, was used for trenching. When trenched, tuber's length and weight were longer and heavier, tuber's shape was better, and marketable tuber yield was remarkably increased than those of conventional plowing and soil preparation by a tractor. The size and yield of tubers were greatly enhanced by trenching in long-tuber variety than that in short-tuber variety. The depth of trenching is recommended to be more than 60cm for short-tuber variety and more than 80cm for long-tuber variety considering the size, shape and yield of the tllbers.

• Korean Journal of Food Science and Technology
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• v.27 no.5
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• pp.652-657
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• 1995

To investigate the lipid components of Korean yams(Dioscorea batatas and Dioscorea aimadoimo), silicic acid column, thin layer and gas chromatographies were applied. Total crude lipid contents in D. batatas and D. aimadoimo were 1.70% and 1.31%, and total purified lipid contents were 1.35% and 0.99% on a dry weight basis. Lipids were fractionated and quantitated by silicic acid column chromatography. The contents of neutral lipids, glycolipids and phospholipids were 43.33, 39.60 and 17.07% in D. batatas and 43.94, 34.74 and 21.32% in D. aimadoimo. Neutral lipids were the most abundant, in which triglycerides and sterol ester were found as the major components. Glycolipids were mainly composed of monogalactosyl and trigalactosyl diglycerides. Phosphatidyl choline and phosphatidyl ethanolamine were the major components of phospholipid. Fatty acids of the total lipids were mainly linoleic and palmitic acids. The fatty acid compositions of neutral lipids, glycolipids and phospholipids were the same tendency as that of total lipids. However, the content of linolenic acid in glycolipids was higher than in neutral lipids and phospholipids when fractionated.

• Korean Journal of Medicinal Crop Science
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• v.6 no.3
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• pp.170-175
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• 1998

This study was conducted to determine the effect of seminal sections of tuber and staking methods on growth and yield of a chinese yam (Dioscorea batatas Decne). Tuber was divided into top head, head, median and tail which were used as seminal sections of tuber. The emergence of shoots was delayed in median and tail sections by 15 days as compared with top head and head sections. Sections from head and tail exhibited yield increase as high as 16 and 15%, respectively, compared to top head sections. Although flowering and bubil setting occurred almost at the same time in all staking methods, fresh weight of stem and leaves was higher in ${\wedge}-$, I-type stake supporting net than in the conventional stake. In the cultivar, 'Dan-ma', tuber yield didn't show a meaningful increase statistically by all staking methods. But ${\wedge}-$ and I-type stake supporting net increased the yield of the cultivar, 'Jang-ma', as high as 11 and 8%, respectively, compared to conventional stake. Also I-type stake was ideal supportor of net, considering the cost of management.

• Korean Journal of Medicinal Crop Science
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• v.8 no.4
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• pp.362-372
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• 2000

This study was conducted to obtain the basic information on the production of high yield and qualitied yam in Andong, major yam-producing district, in Kyongbuk province, using three major Yam cultivars, such as Danma, Jangma and Alata (round type). Alata showed the longest tuber width while Jangma showed the longest tube length. Danma showed the highest tube yield at 2,123 kg/10a. Tubes of Alata had higher dry ratio than those of other cultivars, suggesting that Alata could be used as good processing materials. Characteristics of top parts, such as vine length, leaf number, and lateral vine number showed typical sigmoid curves. Tuber characteristics such as length, width and fresh weight of tuber were linearly increased as the growth period was progressed. Relative growth rate (RGR) for new tuber and stem reached the highest value at 86 DAT (days after transplanting). There were similar tendencies among the cultivars in net assimilation rate (NAR). The highest crop growth rate (CGR) was appeared at 156 DAT regardless of cultivars. In the changes of leaf area ratio (LAR), there were significant differences among three cultivars. LAR were decreased at 86, 106 and 136 DAT for Alata, Danma and Jangma, respectively. However, specific leaf weight (SLW) was greatly increased at 176 DAT, and leaf area index (LAI) was decreased at 156 DAT in all cultivars.

• Journal of Practical Agriculture & Fisheries Research
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• v.7 no.1
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• pp.64-73
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• 2005

This study was done to determine the regional adaptability of Dioscorea opposita in Korea. Suwon, Chunchon, Kangneung, Yonchon and Taean had soil pH of 6.62, 5.65, 5.9, 5.9 and 5.82, respectively, being at more unfavorable conditions than a standard soil condition for yam with pH 6.2. The amounts of organic matter in Suwon, Chunchon, Taean, and Yonchon were 1.96%, 4.51%, 3.76%, 1.89% and 1.12%, respectively, being at more favorable conditions than a standard organic matter in soil for yam with 2.0~3.0%. As the results from cultivating of large plantings in different regions, Suwon showed the largest the tuber dry weight of 135g. In comparison of general component between round yam and short yam in the area of Kangneung, protein of round yam(3.30%) was higher than that of short yam(1.40%). Dryness in round yam(36.5%) was lower than that of short yam(28.9%), indicating a higher dry weight ratio of round yam. In tuber extracts analysis, saponins content was respectively 23.7mg/g in round yam and 10.4mg/g in short yam.

• Proceedings of the Korean Society of Crop Science Conference
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• 1994.06a
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• pp.136-137
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• 1994

• The Korean Journal of Food And Nutrition
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• v.5 no.1
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• pp.49-54
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• 1992

In an attempt of develop composite flours, D. aimadoimo of yams in Korea was investigated with respect to its physicochemical properties and sensory analysis with baking bread. The results are summarized as follows ; 1. Yam had 73.21% of water, 21.65% of carbohydrate, 3.3% of crude protein, 0.25% of fat, 1.60% ash and 20.3%of starch. 2. Sucrose was 78% of the total free sugars in yam flour. It was contained which 67% of total free amino acids were serine, arginine & alanine and 23.6% of total amino acids was glutamic acid. 3. As the yam flour level in amylogram patterns (8% dry basis) was increased, the initial pasting temperature was increased and the viscosity decreased. 4. Replacement of yam flour with 10% wheat flour was the bests in sensory evaluation of the products.