• The Plant Pathology Journal
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• 제34권5호
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• pp.393-402
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• 2018

Rice world production is affected due to the growing impact of diseases such as bacterial panicle blight, produced by Burkholderia glumae. The pathogen-induced symptoms include seedling rot, grain rot and leafsheath browning in rice plants. It is currently recognized the entrance of this pathogen to the plant, from infected seeds and from environmental sources of the microorganism. However, it is still not fully elucidated the dynamics and permanence of the pathogen in the plant, from its entry until the development of disease symptoms in seedlings or panicles. In this work it was evaluated the infection of B. glumae rice plants, starting from inoculated seeds and substrates, and its subsequent monitoring after infection. Various organs of the plant during the vegetative stage and until the beginning of the reproductive stage, were evaluated. In both inoculation models, the bacteria was maintained in the plant as an endophyte between $1{\times}10^1$ and $1{\times}10^5cfu$ of B. $glumae.g^{-1}$ of plant throughout the vegetative stage. An increase of bacterial population towards initiation of the panicle was observed, and in the maturity of the grain, an endophyte population was identified in the flag leaf at $1{\times}10^6cfu$ of B. $glumae.g^{-1}$ fresh weight of rice plant, conducting towards the symptoms of bacterial panicle blight. The results found, suggest that B. glumae in rice plants developed from infected seeds or from the substrate, can colonize seedlings, establishing and maintaining a bacterial population over time, using rice plants as habitat to survive endophyticly until formation of bacterial panicle blight symptoms.

• 한국작물학회지
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• 제8권1호
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• pp.69-81
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• 1970

1. 대두 4개품종을 20개경합처리로 주간간격을 5-10-20-40-80 cm 변화시켜 대두유전자형에 대한 10개형질을 조사하였다. 2. 수량, 100립중, 초장, 분지수, 일주맥수, 맥당립수는 주간간격처리에 의하여 고도의 유의성을 보였다. 3. 절수와 개화일수는 간격처리에 효과가 없었으며 성숙은 4개품종의 간격효과가 상이하였다. 4. 결실기간은 주간간격처리에 대하여 영향을 받았으며 초장은 간격이 넓어짐에 따라 짧아졌으며 감소할수록 증가하였다. 분지수도 간격이 증가하였을 때 증가하였다. 개체수량은 간격이 감소할수록 감소하였으나 전수량은 반대였다. 5. 시비효과는 인정되지 않았다. 또 80cm주간의 수량도 인정되지 않았다. 6. 경합효과에서 강세경합은 금강대립 품종이며 약세경합은 충북백 Shelby였다. 7. 대두수량에 최적간격은 20cm주간이었다. 8. 지방함량은 넓은 간격에서 증가하였으며 단백질함량은 좁은 간격에서 증가하였다.

• 한국작물학회지
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• 제33권4호
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• pp.380-385
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• 1988

The present study was conducted to evaluate agronomic characters of the soybean germplasm which was collected from the sites covering whole areas of southern Korean peninsula. A total of 2,748 Korean native soybeans was grouped for fruiting period and in this group frequency distribution of the important agronomic characters and relationships among the characters were determined. The results obtained were summarized as follows; The soybean germplasm was comprised of SeoulㆍKyonggi-do 7.5%, Kangwon-do 13.3%, Chungchongbuk-6.6%. Chungchongnam-do 12.3%, Chollabuk-do 10.7%, Chollanam-do 12.6%, Kyongsangbuk-do 20.8%, Kyongsangnam-do 15.3% and Cheju-do 0.6% in number of collections. Frequency distribution of the germplasm for fruiting period was 0.14% in Group I (below 55 days). 1.67% in Group II (56-60 days), 10.58% in (Group III(61-65 days), 23.18% in Group IV(66-70 days), 25.91% in Group V(71-75 days) 19.79% in Group Ⅵ(76-80 days), 15.1% in Group Ⅶ(81-85 days) and 3.6% in Group Ⅷ(over 85 days). The lines over 70 days in fruiting period were as much as 64.4% of germplasm. The fruiting period varied largely from 45 days to 91 days. Fruiting period was positively correlated to seed weight, days to maturity, days to flowering, plant height and number of branches per plant, respectively. While. it was negatively correlated to number of pods, lodging and virus infectivity, repectively, and in particular negative correlation was shown significantly between yield and fruiting period. Average yield was very high as much a 1.389kg/ha in fruiting period Group I, and decreased with increment of fruiting period, 1.400kg/ha in Group II. 1.384kg/ha in Group III. 1,299kg/ha in Group IV, 1,197kg/ha in Group V, 1,117kg/ha in Group Ⅵ, 967kg/ha in Group Ⅶ and 832kg/ha in Group Ⅷ.

• 한국수산과학회지
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• 제44권2호
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• pp.155-161
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• 2011

Induction of regeneration and maturation of the free-living gametophytes of Undariopsis peterseniana (Kjellman) Miyabe et Okamura was studied at four temperatures (5, 10, 15, and $20^{\circ}C$), four levels of irradiance (5, 10, 20, and 40 ${\mu}mol$ $m^{-2}\;s^{-1}$) and three photoperiods (14:10, 12:12, and 10:14 h L:D). Female gametophyte fragments were maintained in active regeneration without reaching sexual maturity under conditions of $15^{\circ}C$, 20 ${\mu}mol\;m^{-2}\;s^{-1}$, 10:14 h (L:D), whereas the conditions for male gametophytes were slightly different at $15^{\circ}C$, 20 ${\mu}mol\;m^{-2}\;s^{-1}$, 14:10 h (L:D). The sexual maturation of female and male gametophytes took place under $15^{\circ}C$, 20 ${\mu}mol\;m^{-2}\;s^{-1}$, 14:10 h (L:D) and $10^{\circ}C$, 10 ${\mu}mol\;m^{-2}\;s^{-1}$, 10:14 h (L:D), respectively. These results provide basic information for controlling the regeneration and maturation of free-living gametophytes for artificial seed production of U. peterseniana.

• 한국정보시스템학회:학술대회논문집
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• 한국정보시스템학회 2000년도 추계학술대회
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• pp.26-31
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• 2000

It is said that the focus of managing venture business is currently moving from technology competition to management competition. By the way, the software venture business(SVB) has some weak points in its structural composition and itematization and no professional personnel in other several sections except technology development section. In addition, such basic functions as technology and R & D, finance and accounting, marketing required to the management of business are concentrated on only one man, its representative director. Therefore, this study aims to provide the basic data useful to the establishment of governmental policy in information and communication, to the rearing of the SVB by a local government related to the software, and to the administration of SVB by investigating the actual conditions. This study attempts to examine the literature on venture business and software industry, and its management with a questionnaire about the actual conditions of managing the SVB. The questionnaire is given to 527 local enterprises belonging to the Software Industry Association and to 171 enterprises in the Software Center. This study compromises the characteristics of the SVB, the actual conditions of its technology and R & D, finance and accounting, and marketing. The characteristics of the SVB are classified into categories such as the stage of its growth(the stage of its seed and start-up, the stage of tis development and growth, the stage of its stability and maturity) and the main business(the system integration, the software development for contract, the package software development service, the software-related service). Additionally, the study attempts to analyze positively the actual condition of its management after classified by the areas of business profile, its general management, its technology development, its finance and accounting, and its marketing The result of this study is found that the SVB has a lot of troubles in part of marketing and finance & accounting activity as well as general management. The SVB realizes the importance of the technology development rather than that of management activity including marketing activity. So we expect this study can assist the SVB to establish the business guidelines for own management plans.

• 한국작물학회지
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• 제57권1호
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• pp.83-88
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• 2012

In order to get information on tocopherol content and composition in fifty-six soybean germplasms were evaluated by HPLC. From the principle component analysis, the first three components accounted for 71.6% of the total variance of tocopherol content in the germplasms. Principal component 1 showed significant correlations with all the morphological markers except 100-seed weight. Soybean germplasms were divided into three groups by the first two principal components. The highest content of ${\alpha}$-tocopherol was $38.6{\mu}g$ per g in Tanner, while that of ${\gamma}$-tocopherol was $195.6{\mu}g$ in PI 91073. In case of ${\delta}$-tocopherol, IT 105622 showed the highest value as $29.8{\mu}g$. The contents of tocopherol were gradually increased from the late August to late September, which was 10 days before maturity, in Alchankong and PI 96322. The tocopherol content was higher in seeds from the plants sown early than those sown late. Total tocopherol contents of PI 96188, Geomjeongkong 2, and Suwon 183 grown in Gimje were higher than those grown in Iksan, but the difference was not observed in PI 96322. These results suggest that the contents of tocopherol in soybean were affected not only by the genotypes but also by environment.

• 한국잠사곤충학회지
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• 제43권2호
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• pp.99-103
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• 2001

오디용 뽕품종으로 대성뽕, 대붕뽕 및 대옥뽕을 육성하였으며 큰누에용 장려품종중에서 신광뽕을 선발하였는 바 주요 특성은 다음과 같다. 1. 대성뽕, 대붕뽕 및 대옥뽕은 염색체수가 2n=56인 4배체이고, 신광뽕은 2n=42인 3배체이다. 2. 오디의 종자형성률은 대성뽕, 대붕뽕 및 대옥뽕은 58%이상이였으며 신광뽕은 6.7%로 매우 낮았다. 3.오디의 과중은 대성뽕이 4.05g,대옥뽕이 3.38g,대붕뿐이 2.99g로서 대과형이고 신광뽕은 2.28g로 중과형이다 4. 오디과즙의 당도는 신광뽕은 14.8% , 대옥뽕은 13.7% , 대붕뽕은 13.1% , 대성뽕은 12.7%이며 당산비는 모든 품종이 21이상이다. 5. 오디의 숙기는 신광뽕은 조숙계, 대붕뽕, 대옥뽕은 중숙계 , 대성봉은 만숙계 이다. 6. 오디의 수량성은 대붕뽕은 다수성이고 대성뽕과 신광뽕은 비교적 높은편이며 대옥뽕은 보통 수준이다. 7. 내동(한)성은 신광뽕, 대옥뽕, 대붕뽕은 보통이고 대성뽕은 다소 약하다.

• 한국작물학회지
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• 제28권2호
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• pp.233-239
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• 1983

종전에는 Brassica napus에서 성분이 개량되지 않은 유채의 일반 품종들의 Winter type만을 대상으로 춘파성 정도를 분류하고 추태로서 분류기준을 삼았으나 본 시험에서는 같은 B. napus인 Summer type까지를 포함하고 성분이 개량된 양질유ㆍ양박 품종을 공시하여 임실여부로서 분류기준을 삼는 새로운 분류를 시도하여 춘파성 정도를 조사하였던 바 그 결과를 요약하면 다음과 같다. 1. 현재 목포지장에서 보유하고 있는 양질유ㆍ양박 유채(Brassica napus) 품종 및 육성계통들은 8단계 group으로 춘파성 정도를 분류할 수 있었고 춘파성 정도 제Ⅶ group는 Summer type의 계통들이 이에 속하였으며 이들 계통은 Oro, Midas 등의 Summer type의 품종과 교배하여 선발된 계통들이었다. 2. 춘파 파종기에 따른 성숙기변화는 춘파시기가 늦을수록 성숙기는 지연되는 경향이었고 춘파성 정도가 높음에 따라 생육일수와 적산온도가 줄어드는 경향이었다. 3. 춘파성 정도와 내한성 관계는 춘파성 정도가 높을수록 내한성이 낮았으며 춘파성 정도와 초성간에는 춘파성이 높을수록 초성에서 I형에 가깝고 주경의 신장이 분지보다 빈약한 바 이들 모든 상호관계는 고도의 부상관으로 나타났다. 4. 월동에 안전한 추파재배용계통은 춘파성 정도가 낮은 0, I, II group로서 공시품종중 59 품종이 이에 속하였다.

• 한국자원식물학회지
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• 제35권6호
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• pp.785-795
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• 2022

Traditional germplasms are unsuitable for mechanized production, limiting adzuki bean production. The creation of cultivars that can be harvested by mechanized means is an urgent task for breeders. The bottom pod height (BPH), lodging resistance, and synchronous maturing of adzuki beans are critical factors for the reduction of losses due to mechanized harvesting. In this study, 14 traits of 806 adzuki bean accessions were analyzed. All growth stages and the yield, lodging score, and synchronous maturing correlated negatively with the BPH. These negative correlations reflect the increased difficulty of breeding to simultaneously satisfy the needs for no lodging, high synchronous maturing rates, BPHs > 10 cm, and high yield. We screened three germplasms with no lodging, high synchronous maturing rates, and BPHs > 10 cm that were used as mechanization-adapted breeding material for crossing with high-yield cultivars. Agronomic trait diversity in adzuki beans was also examined in this study. Principal component and cluster analyses were conducted for 806 germplasms resulting in three clusters with the yield and three growth stage traits serving as the main discriminating factors. Cluster 1 included high-yield germplasms with the number of pods per plant and the number of seeds per pod being the major discriminant factors. Cluster 2 included germplasms with long growth periods and large 100-seed weights while cluster 3 contained germplasms with high BPHs. In general, the characteristics that make mechanical harvesting feasible and those assessed in this study could be utilized to choose and enhance adzuki beans production.

• 한국초지조사료학회지
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• 제43권3호
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• pp.138-147
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• 2023

Buckwheat (Fagopyrum esculentum), which is a traditional Korean crop, has been known as a health food due to its rich nutrition. This study was conducted to evaluate the change in flavonoid content of flowers and seeds during post-flowering growth of Korean tartary buckwheat variety 'Hwanggeummiso', with the aim of providing basic data for the development of functional food and feed additive. Tartary buckwheat took 69 and 99 days from the sowing date to reach the flowering and maturity stages, respectively. As a result of examining the flavonoid components of each part of tartary buckwheat, chlorogenic acid, rutin, and isoquercitrin of flowers increased from the flowering period on 22 May (0 days after flowering) to 42 days after flowering, while quercetin increased until 21 days after flowering and then decreased thereafter. In seeds, chlorogenic acid, rutin, and isoquercitrin were most abundant at the time of seed-bearing on 14 days after flowering, and showed a decreasing tendency thereafter. On the other hand, quercetin showed a tendency to increase until 21 days after flowering and then decrease. Overall, the flavonoid content was higher in flowers than in seeds, with rutin being particularly prominent. Based on this, the possibility as food materials and feed additives was confirmed using buckwheat produced in Korea.