• KOREAN JOURNAL OF CROP SCIENCE
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• v.60 no.1
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• pp.54-62
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• 2015

To analysis of virus free sweetpotato effect, 5 virus free sweetpotato and virus normal sweetpotato varieties were planted in 5 different regions at 2010 year. The average yields of virus free sweetpotato are showed different results according to regions. Sinjami which cultivated at Iksan were increased maximum 68% compare to normal. However, Sinjami which cultivated in Hamyang were decreased yield 11% compare to normal. Analysis of tuber formation ratio of Sinjami, Yenhwangmi, Singeonmi which cultivated in Nonsan were decreased tuber number compare to normal. However, 3 varieties were all increased on Average storage root weight and yield of marketable storage root. In the results of analysis of marketable storage root according to cultivated regions and varieties, all varieties except Sinjami which cultivated in Hamyang were increased yield. Also, quality of virus free sweetpotato were enhanced 7 to 9 compare to virus infected sweet potato which showing average 3. Contents of starch between virus free and virus infected sweetpotato were not affected by virus. Virus free sweetpotato were more increased starch products according to increased total production yield. Also, $Brix^{\circ}$(%) was not showing difference between virus free and virus infected sweetpotatoes. In this experiment, Virus free sweetpotato are enhanced production yields and quality. Therefore, we suggested that virus free sweetpotato is one of the methods to reduce damage by sweetpotato virus.

• Journal of the Korean Applied Science and Technology
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• v.32 no.1
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• pp.93-99
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• 2015

The aim of this study was to analyze nutritional compositions of rapeseed pollen granules and to determine the possible usage of pollen granules as a yeast culture medium. Rapeseed pollen granules (per 100 g) were consisted of carbohydrate 58.9 g, protein 20.8 g, fat 4.1 g, ash 2.5 g and water 13.7 g. And fructose (13.7 g), glucose (11.1 g), and sucrose (6.6 g) of sugars and K (606.7 mg) and P (603.3 mg) of minerals were highly contained. In addition, free amino acids such as glutamic acid (2,482.4 mg), aspartic acid (2,136.5 mg), lysine (1,648.3 mg), and leucine (1,631.1 mg) were present at a higher level. When liquid medium, which was made from cracked pollen granules (5, 10, 15, 20, 25, 30, and 40 g/L), was tested for yeast culture, liquid medium containing pollen granules over 15 g/L showed higher yeast growth than YPD medium (control). Liquid medium containing both cracked pollen granules (15 g/L) and NaCl (1 ~ 20 g/L) improved yeast growth than the liquid medium without NaCl. In addition, when yeast growth was tested on solid medium made from pollen granules (15 g/L) at $30^{\circ}C$ for 2 days, yeast colonies were equally well-formed like those grown on YPD medium. Overall, rapeseed pollen granules have potential properties on yeast growth and could be used as a primary source for yeast culture.

• Korean Journal of Food Science and Technology
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• v.42 no.1
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• pp.21-26
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• 2010

Microbial-fermented tea (MFT), which is made by microorganisms through fermentation, is a popular beverage in Asia, especially in the Yunnam province, China. In this study, changes of the chemical constituents and antioxidant activity during the manufacturing process of MFT were investigated. MFT were respectively prepared from fresh leaves of three different tea species (Yabukita, Daecha, and Korean wild cultivar) and a processed green tea (Korean wild cultivar). The color of the tea infusions gradually changed to red and yellow as a function of fermentation time. Total nitrogen and caffeine contents were not significantly changed. Whereas, the chlorophyll, tannin, and total catechins contents gradually decreased. Interestingly, the epicatechin and epigallocatechin contents increased up to 25 days of fermentation and then decreased. Change of the chemical constituents of all samples showed the same patterns. The antioxidant activity of MFT from Daecha and Yabukita slightly decreased as increasing fermentation time. However, the range over which the antioxidant activity of MFT from Korean wild cultivar and green tea were not changed. This research suggests that it may be possible to manufacturing possibility of MFT using Korean wild cultivar and processed green tea.

• Korean Journal of Plant Resources
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• v.28 no.1
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• pp.111-118
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• 2015

The objective of this study was to determine the response of rapeseed (Brassica napus) to different planting date in the spring and varieties on growth and flowering characteristics. Eight rapeseed varieties were sowed at 10 day interval from 1st to 31th of March at Muan and Jeju in Korea. Significant planting dates and rapeseed varieties effects for growth, start of flowering and duration. As the planting date was being delayed, plant length and flower number were decreased, but branch number was increased. And, start of flowering date was retarded and flowering duration decreased with later planting date. Days from planting to flowering was shortened as seeding date was delayed and shortening degree was similar between experimental locations, Muan and Jeju. The days to flowering for rapeseed about 73~94 days for 1st March and then decreased to 57~71 days for the 31th March of planting date. 'Tammiyuchae' and 'Mokpo 111' seeded on each planting date come into blossom more earlier about 10 days as compared to 'Tamlayuchae' and 'Naehanyuchae'. The duration of flowering for the B. napus varieties was shortened as planting date was delayed. The results revealed that flowering characteristics of rapeseed can be greatly enhanced by planting as early as possible, and early flowering varieties i.e. 'Tammiyuchae' and 'Spring' were the most suitable varieties among the tested varieties for planting in the spring.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2020.08a
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• pp.52-52
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• 2020

유채(Brassica napus L.)는 식용유 생산을 목적으로 재배되며, 1975년에는 26.8천ha가 재배되어 연간 생산량이 34.7천톤이 생산되었으나, 외국으로부터 값싼 식용유의 대량수입으로 재배면적이 급격하게 감소되었다. 그러나 최근에 지방자치단체를 중심으로 경관용 재배면적이 증가하고 있고, 건강에 대한 관심이 높아짐에 따라 국내산 non-GM 식용유 생산을 목적으로 유채 재배면적이 급격하게 증가하고 있다. 유채의 대량생산을 위해서는 논 재배가 필수적이나 유채와 벼의 이모작 재배 시기가 겹치는 문제점이 발생하고 있어 조생종 유채의 품종개발과 함께 봄 파종이 가능한 유채의 품종 육성에 대한 요구가 매우 높다. 따라서 본 연구에서는 국내 보유 유채를 포함하는 십자화과(Cruciferae) 유전자원의 특성 평가를 통해 극조숙 유채 품종 육성을 조기에 육성하기 위해 실시하였다. 농촌진흥청 국립유전자원센터에서 분양받은 유전자원 146계통을 파종 재배하면서 핵형분석과 외부형질을 기준으로 정확한 종을 동정하였고, 각 유전자원의 생육 및 개화특성을 조사하였다. 유전자원들을 세포분석기를 이용하여 핵형을 분석한 결과, 전체 146개의 유전자원 중 유채(B. napus L.) 128계통, 갓(B. juncea Sinsk) 6계통, 배추(B. campestris Makino) 9계통, 미분류 3계통 등으로 조사되었다. 유전자원을 가을 파종(10월 22일)하였을 때 개화가 가장 빠른 계통(IT 279089)이 파종 후 137일 이후인 3월7일부터 개화가 시작되었고, 가장 늦은 계통(IT 279198)은 191일 후인 4월 30일에 개화가 시작되었다. 봄 파종(2월 4일)하였을 때 개화가 가장 빠른 계통(IT 279089)이 파종 후 79일 이후인 4월 23일부터 개화가 시작되었고 IT 279092 등 29계통은 추대와 개화가 되지 않았다. 위와 같은 연구결과를 토대로 개화시기가 빠른 유전자원을 육종을 위한 인공교배 시화분친이나 종자친으로 이용하면 지방산 품질이 좋고 극조숙성인 유채 품종의 개발이 가능할 것으로 생각된다.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.56 no.3
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• pp.183-191
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• 2011

This study was undertaken to collect basic knowledge of Jatropha which is one of bio-energy crops, based on the understanding of physiological and molecular aspects under salt and drought conditions. The treatments were followed as: 100, 200 and 300 mM NaCl for salt stress and 5, 10, 20 and 30% PEG for drought stress for 8 days, respectively. Leaf growth, stomatal conductance, chlorophyll fluorescence and gene expression of aquaporin (JcPIP2) of Jatropha were investigated. From 2 days after treatments, plants treated with higher than 100 mM NaCl and 10% PEG respectively were significantly suppressed in leaf length, width, and stomatal conductance, but 5% PEG treatment showed that plant growth was improved more than control plant. Semi-quantitative RT-PCR analyses revealed that the JcPIP2 gene was expressed in root, stem, cotyledon and leaves. It was not detected in leaves at 200 and 300 mM NaCl treatments. However, transcripts of JcPIP2 were induced in roots and stems under salt and drought conditions compared to those of healthy plants. Therefore, it was concluded that JcPIP2 plays an important role in improving drought tolerance.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.64 no.1
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• pp.55-62
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• 2019

Rapeseed meal, which is a byproduct of rapeseed oil extraction, improves crop productivity by supplying nutrients to the soil. The present study aimed to manufacture fermented rapeseed meal compost using two effective microbial agents and evaluate their efficiency as fertilizer. To types of fermented rapeseed meal, manufactured using either a bio-carrier or microbial agent, showed no differences in pH, electrical conductivity (EC), and total nitrogen content. However, the contents of $NH_4-N$ and $NO_3-N$ as inorganic nitrogen were increased by 5.6 times and 1.5 times, respectively, after 5 d of fermentation. Rapeseed meal fermented for 5 d was applied to tomato a basal fertilizer and after eight weeks, the plant height increased in all fermented rapeseed treatments compared to that in the chemical fertilizer treatment, and also the quantum yield of photosystem II (PS II) showed the same trend. The total nitrogen content of tomato leaves treated with a microbial fermented rapeseed meal was twice as high as that of that treated with a chemical fertilizer. It was confirmed that the increase in the tomato height was an effect of the rapeseed meal containing inorganic nitrogen, which can easily be absorbed by plants. From these results, it is considered that fermented rapeseed meal manufactured with an effective microbial agent for 5 d showed the highest inorganic nutrient content and greatest growth enhancement in tomato.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.66 no.4
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• pp.383-391
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• 2021

To develop a cultivation method for the mass production of sweetpotato cultivars, 'Juhwangmi' (orange tuber) and 'Sinjami' (puple tuber), the yield of tuber roots and content of various functional substances were analyzed according to planting intervals and growing periods. For 'Juhwangmi, the total yield of tubers was increased by respectively 36% and 54% and the yield of tubers over 300 g was increased by respectively 170% and 221% in the 140-day and 160-day cultivation plots compared with that in the 120-day cultivation plot at the 70×20 cm planting interval. Similarly, the total content of beta-carotene in the tubers increased as the cultivation period was extended. In particular, beta-carotene content at the 70×20 cm planting interval was the highest. For 'Sinjami', at the same planting interval, the total yield of tubers and yield of tubers over 300 g significantly increased as the growing period was extended. Within the same cultivation period, the yield of tubers over 300 g and the total anthocyanin content of 'Sinjami' were higher at the 70×30 and 70×35 cm planting intervals than at the 70×20 and 70×25 cm planting intervals in the 140-day and 160-day cultivation plots. Moreover, the total polyphenol and flavonoid content was significantly higher in 'Sinjami' than in 'Juhwangmi', and the values were the highest in the 160-day cultivation plots. In particular, the content of these two functional substances in tubers over 300 g was the highest at the 70×30 and 70×35 cm planting intervals.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.68 no.1
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• pp.20-26
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• 2023

Fiber content in the storage roots of sweetpotato varies between different varieties. For examples, the high fiber content of certain types has a poor texture when steamed or roasted. This study was conducted to evaluate the optimal sieve mesh size for separating fibers, the chemical composition of fibers and differences in fiber content among different varieties. We found that the separated fiber content (dry weight) of mashed and steamed sweetpotato was higher after washing three times (143.3 mg/100 g) compared with that washed five times (128.4 mg/100 g). The Hogammi variety remained 85.9% of total fiber content at 10 mesh (2,000 ㎛) and 9.6% of total fiber content at 30 mesh (600 ㎛), and Jinyulmi remained 74.9 and 16.7% of total fiber content , respectively. Therefore, a 30 mesh sieve was considered the most suitable for fiber separation. Among the 10 studied cultivars, Jinhongmi showed the lowest amount of fiber (24.8 mg/100 g) and Hogammi had the highest amount (111.4 mg/100 g), which was 4.5 times larger than that of Jinhongmi. Cellulose, hemicellulose and lignin content of separated fibers showed no difference between the viscous-type Hogammi and powdery-type Jinyulmi varieties, with averages of 32.5, 22.3 and 29.6%, respectively. Correlation results using the Image J program showed a significant correlation between the distribution of the stained area and the fiber content (R = 0.74, p < 0.05). Staining distribution differed among varieties, suggesting that a simple fiber content test could be performed using the staining method on raw sweetpotato. These results provide useful information to help inform farmers on the fiber content of different sweetpotato varieties.

• Korean Journal of Breeding Science
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• v.42 no.3
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• pp.294-297
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• 2010

A new intermediate parent 'Wonye 30001' (Allium cepa L.) was developed by Bioenergy Crop Research Center, NICS in 2009. As a male sterile line, 'Wonye 30001' could be used for hybrid seed production by crossing with pollen parent. The first cross was conducted in 2000. Male sterile plants were selected from 'Ginque' breeding lines and fertile plants were selected from YG-1-1. The male sterile line 'Wonye 30001' has circular bulb and bulb weight of 260 g. As mid-late maturing type, lodging date is around May 20. Plant height and stem diameter are 57 cm and 15.9 mm, respectively. In seed harvesting characteristics, number of flower stalks and the length are 6 and 135cm, respectively. Flowering date of 'Wonye' is May 23 and is completely male sterile. 'Wonye 30001' is a promising male sterile line for hybrid bulb onion seed production.