• KOREAN JOURNAL OF CROP SCIENCE
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• v.62 no.2
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• pp.149-155
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• 2017

To establish cultivation areas for the stable production of yacon, this study investigated the productivity and functional component contents of yacon in eight regions of Korea from 2011 to 2013. The results of principal component analysis using these data were as follows. A survey of 16 agricultural traits and meteorological data in the eight yacon cultivation areas showed that five factors (average temperature, maximum temperature, minimum temperature, frost-free days, and fructooligosaccharide content) were highly significant at the p < 0.001 level. Among the 16 agricultural traits and meteorological data used in the main component analysis of yacon cultivation areas, approximately eight contributed to the first principal component, and approximately four contributed to each of the second and third principal components. In particular, factors related to productivity, fructooligosaccharide content, and temperature change were considered important criteria for the classification of cultivation areas. The cultivation areas were divided into three groups by principal component analysis. In Group I, containing the Jinbu and Bonghwa areas in the mid-highland region at 500-560 m above sea level, the product yield was the highest at 2,622-3,196 kg/10a, the fructooligosaccharide content was also the highest at 9.04-9.62%, and the mean temperature was $17.3-18.5^{\circ}C$. In Group II, the areas Suncheon, Okcheon, Yeoju, and Gangneung, at 20-180 m above sea level, had the lowest yield, relatively lower fructooligosaccharide content, and the highest temperature. The areas in Group III showed values intermediate between those of Group I and Group II. For the different yacon cultivation areas, the product quantity and fructooligosaccharide content differed according to the environmental temperature, and the temperature conditions and number of frost-free days are considered important indicators for cultivation sites. Therefore, in terms of producing yacon with high quality, cultivation at 500-560 m is considered to give a higher yield and functional fructooligosaccharide content.

• Korean Journal of Plant Resources
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• v.20 no.1
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• pp.86-88
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• 2007

This experiment was carried out to find out proper soil acidity (pH) that can enhanced ornamental worth and marketability on flowerpot cultivation of Saxifraga stolonifera. It was treated 3 replications of randomized complete block design to pH 4.5, 5.0, 5.5 and 6.0. Soil was used peatmoss and young plant of Saxifraga stolonifera planted at 10cm pot of diameter. It was investigated to growth characteristics at intervals of twenty days after planting. On the growth characteristics at different soil acdity (pH) of Saxifraga stolonifera, It was many growth increment of plant width, plant height, leaf length and leaf width on pH 4.5, but was remarkably reduced growth increment on a higher soil acidity (pH). Therefore, Saxifraga stolonifera was showed the best growth when planted at soil of $pH4.5{\sim}5.0$.

• Journal of Crop Science and Biotechnology
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• v.11 no.2
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• pp.101-106
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• 2008

To identify inheritance of clubroot disease resistance genes in Chinese cabbage, seedling tests of $BC_1P_1,\;BC_1P_2$, and $F_2$ populations derived from $F_1$ hybrid(var. CR Saerona) using single spore isolate(race 4 identified with William's differential host) from Plasmodiophora brassciae were conducted. Resistance(R) and susceptible(S) plants segregated to 1:0 in backcross to the resistant parent. The $F_2$ population segregated in a 3(R):1(S) ratio. This result implied that the resistance of clubroot disease is controlled by a single dominant gene to the race 4 of P. brassicae in CR Saerona. To develop DNA markers linked to clubroot resistance genes, 185 plants of CR Saerona among $F_2$ populations were used. A total of 300 arbitrary decamer was applied to $F_2$ population using BSARAPD(Bulked segregant analysis-Randomly amplified polymorphic DNA). One RAPD marker linked to clubroot resistance gene in CR Saerona($OPJ_{1100}$) was identified. This marker was 3.1 cM in distance from resistance gene in $F_2$ population. This marker may be useful for a marker-assisted selection(MAS) and gene pyramiding of the clubroot disease resistant gene in Chinese cabbage breeding programs.

• Korean Journal of Soil Science and Fertilizer
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• v.47 no.6
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• pp.425-431
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• 2014

Most fields in highland areas are covered with rye or hairy vetch for conservation during a fallow. However, using cover crops needs an effort to sow, and this makes top soil more vulnerable to loss due to surface disturbances. The aims of this study were to develop an automatic seeding-regulator device using a low-price, extensive-use GPS sensors and a DC motors and to evaluate a working efficiency of it after adaptation to partial tillage machine for reducing seeding effort. The amount of runoff water and soil loss was evaluated with partial tillage and simultaneous-seeding after harvesting soybean, in 17% slope lysimeters. In results, the seeding amount with the machine speed was stable between $0.5{\sim}0.8m\;s^{-1}$ of working sections. The automatic control device of seeding-rate could be enough to solve the slip problems of power selecting supply system or five four-wheel drive device. In partial tillage and simultaneous seeding, runoff water was 11.6% ($1.8m^3ha^{-1}$) of the scatter-seeding control ($15.5m^3ha^{-1}$) and soil loss was 13.2% ($7kg\;ha^{-1}$) of the scatter-seeding control ($53kg\;ha^{-1}$). These results suggest that partial tillage and simultaneous-seeding methods are very effective in decreasing work effort and soil loss of sloped land.

• Korean Journal of Plant Resources
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• v.19 no.4
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• pp.515-516
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• 2006

This experiment was carried out to find out proper culture soil for the flowerpot cultivation of Sedum kamtschaticum. Peatmoss was used for the culture soil. pH of the culture soils were adjusted to 4.5, 5.0, 5.5 and 6.0 using calcium hydroxide. Young plants of Sedum kamtschaticum were planted in the pots of 10cm in diameter. The experiment was conducted by the completely randomized design with 3 replications. Growth characteristics were investigated at intervals of 30 days after planting. As the pH of culture soil is lower, growth of Sedum kamtschaticum showed longer plant height and more number of leaves and branches. pH 4.5 to 5.0 appeared to be optimum range as soil reaction of Sedum kamtschaticum cultivation.

• Korean Journal of Breeding Science
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• v.40 no.3
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• pp.258-262
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• 2008

The experiment was conducted to investigate the potential for environmentally friendly cultivation of cv. Haryeong, which was bred by the National Institute of Highland Agriculture in 2006, through evaluation of the late blight field resistance at the farmer's practices level. cv. Haryeong showed higher field resistance to late blight as 590.3 in mean Area Under the Disease Progress Curve (AUDPC) during the cultivation period than cv. Superior as 1377.7 in AUDPC. However there was no observed different trend among the experimental treatments. Mean of tuber yield of cvs. Haryeong and Superior were 2,870 kg/10a and 2,301 kg/10a, respectively, and in all experimental treatments Haryeong was 25% higher than those of Superior. Mean of dry matter content of Haryeong and Superior were 18.1% and 16.1%, respectively, and there were no significant differences among the experimental treatments. cv. Haryeong was confirmed as a suitable cultivar for environmentally friendly cultivation in this experiment. In the future, additional research on fertilization and disease management will be required.

• Korean Journal of Plant Resources
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• v.31 no.6
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• pp.714-718
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• 2018

A new Gomchwi cultivar 'Sammany' was developed by a cross between Gomchwi (Ligularia fischeri (Ledeb.) Turcz.) and Handaeri-gomchwi (Ligularia fischeri var. spiciformis Nakai). Gomchwi is a common Korean name referring wild edible plant species within Ligularia genus. 'Sammany' has purple colored petiole ears and petiole trichome is absent. It has 2nd degree leaf vein density. Plant height, leaf length, leaf width and petiole length were 46.2, 19.1, 19.5 and 32.1 cm, respectively. Plant height was higher than 'Gondalbi'. Bolting occurred in mid. July and it flowered from late August to early September. 'Gondalbi' bolted and flowered 26 days earlier than 'Sammany', and consequently has earlier flowering time more than 26 day. Leaf number of 'Sammany' was 156 per plant but 'Gondalbi' had 130. 'Sammany' had thicker leaves (0.61 mm) compared to 'Gondalbi' (0.46 mm). As a result, yield was higher in 'Sammany (1,077 g/plant)' than 'Gondalbi (798 g/plant)' and leaf hardness was lower in 'Sammany ($20.8kg/cm^2$)' compared to 'Gondalbi ($23.0kg/cm^2$)'. In addition, 'Sammany' was found to be moderately resistant to powdery mildew. With enhanced agronomic and pathology traits, 'Sammany' was newly registered as a new Gomchwi cultivar (variety protection no. 131 on May 2017).

• Proceedings of the Plant Resources Society of Korea Conference
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• 2020.08a
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• pp.75-75
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• 2020

Potatoes were first introduced outside the Andes region four centuries ago, and have become an integral part of much of the world's food. Potatoes were first introduced into Europe in the 16th century and Korea in the early 19th century. Potatoes have a short growing season, high production per unit area, relatively strong environmental adaptability, and are cultivated in more than 130 countries around the world. It is the world's fourth-largest crop, following rice, wheat, bean and maize. In the nutritional aspects, potatoes contain abundant vitamins and minerals, as well as an assortment of phytochemicals such as carotenoids and natural phenols. Due to the high content of potato functional compounds, it has known that potatoes are effective in the prevention of various human diseases. In particular, the potato contains a large amount of polar compounds, including the saponin in the polar compounds, and the physiological activity of the saponins, such as immunity enhancement, antioxidant and anti-inflammatory is known. In this study, the antioxidative activity of polar compounds from five potatoes was examined by cell based anti-oxidation assay. The smallest amount of ROS(Reactive oxygen species) was generated when the compound was derived from 'Haryung' and 'hongyoung' and strong SOD(Superoxide dismutase) activity was observed in 'Sumi' and 'Jayoung'. The results of this study reveal the antioxidative effect of polar compounds extracted from various kind of potatoes, which will enable the acquisition of new bioactive candidates and the establishment of new profit generation models for farmers

• Proceedings of the Plant Resources Society of Korea Conference
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• 2023.04a
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• pp.26-26
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• 2023

포스트 코로나 이후 먹거리에 대한 소비자의 인식전환으로 건강먹거리인 야콘에 대한 관심이 증가하고 있다. 야콘은 남미 안데스에서 도입된지 40여년 되었으며 달콤한 맛과 아삭아삭한 식감을 가져 생식용과 야콘즙으로 인기있으나 현재 국내 육종된 품종이 없다. 따라서, 다양한 유전자원을 확보하고 자원에 대한 평가를 통해 신품종 육성을 위한 기초 자료로 활용하고자 실시하였다. 연구에 사용된 재료는 국립식량과학원에서 보유하고 있는 5개 자원을 대상으로 초장, 엽수, 줄기수, 생체중, 관아수량, 괴근수량 등을 조사하였으며, 조사방법은 농촌진흥청 농업과학기술 연구조사 분석기준(RDA, 2012) 준하였다. 야콘 유전자원의 지상부 특성 결과, 초장이 92-127cm 범위를 보였으며, 줄기수는 8-12개, 경엽중은 1,433-2,855kg, 엽수는 152-195개의 범위를 보였다. 또한, 유전자원별 지하부 특성을 살펴보면, 유전자 원별 HY1이 관아수가 가장 많고, 관아수량도 352/10a으로 가장 무거웠다. 괴근수량을 살펴보면, HYL2가 총수량이 5,197 kg/10a, 상품수량이 4,213 kg/10a으로로 가장 많았으며, HYL3, HYL4, HYL5, HYL1 순이었다. 유전자원의 생리장해 결과를 조사한 결과, 열근 및 부패발생은 HYL1이 가장 심하였으며, HLY5가 상대적으로 약했다. 유전자원의 품질특성을 조사한 결과, 당도는 HYL5가 12.5로 가장 높았으며, HYL1이 8.7로 가장 낮았다. 이상의 결과를 바탕으로, 향후 야콘의 인공교배 단계에서부터 육종프로그램에 활용할 계획이다.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2021.04a
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• pp.26-26
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• 2021

메밀(Fagopyrum esculentum Moench)은 마디풀과(Polygonaceae) 메밀속 (Fagopyrum)으로 약 20종이 있으며, 전 세계 인류 역사와 함께해 왔으며, 오랫동안 사랑을 받아 온 작물이다. 메밀 생태형 분류는 늦게 파종할수록 종실 수량이 떨어지는 여름메밀, 반대로 늦게 파종할수록 종실 수량이 증가하는 가을메밀과 중간형 메밀이 있다. 여름메밀 대표품종은 양절메밀, 양절메밀2호가 있다. '양절메밀'은 춘파·하파 재배가 가능한 여름메밀 품종으로, 1994년 육성되어 장려 품종으로 결정되었다. '양절메밀'의 특성은 유한생육 초형으로, 조숙·단간·다수성 이며, 꽃색은 흰색이며 종자는 흑색이다. 성숙일수는 60-64일로 짧으며, 성숙 후에도 탈립이 강하고, 경장은 단간으로, 도복에 강한 편이다. 그 후 수량성이 증가된 '양절메밀 2호'가 육성되었다. 양절메밀2호는 대립종자로 종자가 흑갈색이며 천립중도 29.5g으로 양절메밀보다 무겁다. 가을메밀로는 대산메밀, 다원 및 순백이 육성되었다. 싹용인 '대산메밀'은 줄기가 연홍색이고 종자가 갈색이었다. '대산메밀'은 가을메밀 품종으로 가을 재배에 적합하다. 경장은 중장간종이며, 생육 일수는 양절메밀보다 약간 늦은 중생종이다. 메밀싹 수율이 높아 새싹 재배에 적합한 것으로 나타났다.