Effects Water Stress on Physiological Traits at Various Growth Stages of Rice

Choi, Weon-Young,Park, Hong-Kyu,Kang, Si-Yong,Kim, Sang-Su,Choi, Sun-Young The Korean Society of Crop Science 1999 Korean journal of crop science Vol.44 No.3

The object of this study was to determine the difference of the time course changes of transpiration, diffusion resistance and photosynthetic rate of rice at several different growth stages subjected to soil moisture stress (SMS) and recovery by irrigation. A japonica rice cultivar 'Dongjinbyeo', was grown under flooded condition in a plastic container filled with silty loam soil. At 5 main growth stages, the container was treated by SMS until initial wilting point (IWP) and then reirrigated. The duration of SMS until IWP were the longest, 13 days for tillering stage, and the shortest, 7 days for panicle initiation and meiosis stage. The transpiration rate rapidly decreased during SMS and the transpiration rate at IWP of the stressed plant showed 10∼20% compared with control, and the transpiration rate of stressed plant at most growth stages also recovered rapidly after irrigation and then reached 100% of control within a week. The shoot photosynthetic rate in all growth stages rapidly decreased by SMS, and the rates at IWP of stressed plants were de-creased nearly to 0%, beside the treatment at tillering stage. The recovery degree of photosynthetic rate by irrigation ranged from 20 to 90%, showed higher at early growth stages of SMS treatment than that of later stages. At all growth stages the leaf diffusion resistance of stressed plants was over 3 times that of the control resulting from a rapid increase at 3 to 5 days after draining for SMS, and showed quick recovery by irrigation within 3 days after drainage. The above physiological parameters changed in close relation with the decrease of the soil matric potential after SMS. These results indicate that at all main growth stages of rice plants the transpiration and photosynthesis reduction by stomatal closure reponded sensitively to the first stage of SMS closely related with decrease of soil water potential, while those recovery pattern and recovered degree by irrigation are little different by growth stage of rice.

Effects Water Stress on Physiological Traits at Various Growth Stages of Rice

Weon Young Choi,Hong Kyu Park,Si Yong Kang,Sang Su Kim,Sun Young Choi 韓國作物學會 1999 Korean journal of crop science Vol.44 No.3

The object of this study was to determine the difference of the time course changes of transpiration, diffusion resistance and photosynthetic rate of rice at several different growth stages subjected to soil moisture stress (SMS) and recovery by irrigation. A japonica rice cultivar 'Dongjinbyeo', was grown under flooded condition in a plastic container filled with silty loam soil. At 5 main growth stages, the container was treated by SMS until initial wilting point (IWP) and then reirrigated. The duration of SMS until IWP were the longest, 13 days for tillering stage, and the shortest, 7 days for panicle initiation and meiosis stage. The transpiration rate rapidly decreased during SMS and the transpiration rate at IWP of the stressed plant showed 10∼20% compared with control, and the transpiration rate of stressed plant at most growth stages also recovered rapidly after irrigation and then reached 100% of control within a week. The shoot photosynthetic rate in all growth stages rapidly decreased by SMS, and the rates at IWP of stressed plants were de-creased nearly to 0%, beside the treatment at tillering stage. The recovery degree of photosynthetic rate by irrigation ranged from 20 to 90%, showed higher at early growth stages of SMS treatment than that of later stages. At all growth stages the leaf diffusion resistance of stressed plants was over 3 times that of the control resulting from a rapid increase at 3 to 5 days after draining for SMS, and showed quick recovery by irrigation within 3 days after drainage. The above physiological parameters changed in close relation with the decrease of the soil matric potential after SMS. These results indicate that at all main growth stages of rice plants the transpiration and photosynthesis reduction by stomatal closure reponded sensitively to the first stage of SMS closely related with decrease of soil water potential, while those recovery pattern and recovered degree by irrigation are little different by growth stage of rice.

Effects of Water Stress by PEG on Growth and Physiological Traits in Rice Seedlings

Weon-Young Choi,Si-Yong Kang,Hong-kyu park,Sang-Su Kim,Ki-Sang Lee,Kyu-Seong Lee,Hyun-Tak Shin,Sun-Young Choi 韓國作物學會 2000 Korean journal of crop science Vol.45 No.2

This study was conducted to evaluate the drought tolerance of Japonica and Indica rice cultivars during germinating and seedling stages by using the polyethylene glycol (PEG) solution. Each 5 cultivars of Japonica and Indica were cultured from 14 days after seeding(DAS) to 21 DAS using the PEG solution in a moderate water potential (-0.63 MPa). The lengths of radicle and plumule during the germinating stage were inhibitied by the PEG treatment to about 50% and 85%, respectively. The application of PEG to the seedling of two rice types caused to inhibit the plant height and leaf age about 23 % and 10%, respectively. Shoot and root dry weights by PEG treatment were inhibited more severely in Japonica than those in Indica. The difference on delaying of leaf area expansion between both rice types was not found with treatment of PEG, while the leaf color was increased in both Japonica and Indica by 19.9% and 9.2%, respectively. The average photosynthetic ability was inhibited more in Japonica to 36.0% than did Indica to 27.9%. The stomatal conductance was severely affected by PEG treatment, and the degree was varied in both rice types, ranged with 80-85% in Japonica and 29.3-81.6% in Indica. These results indicate there is little relationship between seed germination and seedling growth under the stress of low water potential.

Prevention and Control of Antimicrobial Resistance and Zoonoses : Congeners of PCDD/Fs and Co-PCBs Patterns in Beef Consumed in Korea

( Si Weon Choi ),( Soo Yeon Kim ),( Hyon Suk Lee ),( Mee Kyung Kim ),( Dong Gyu Kim ),( Sung Ok Song ) 대한인수공통전염병학회 2007 창립총회 및 학술대회 초록집 Vol.2007 No.1

Effects of Water Stress by PEG on Growth and Physiological Traits in Rice Seedlings

Choi, Weon-Young,Kang, Si-Yong,Park, Hong-Kyu,Kim, Sang-Su,Lee, Ki-Sang,Lee, Kyu-Seong,Shin, Hyun-Tak,Choi, Sun-Young The Korean Society of Crop Science 2000 Korean journal of crop science Vol.45 No.2

This study was conducted to evaluate the drought tolerance of Japonica and Indica rice cultivars during germinating and seedling stages by using the polyethylene glycol (PEG) solution. Each 5 cultivars of Japonica and Indica were cultured from 14 days after seeding(DAS) to 21 DAS using the PEG solution in a moderate water potential (-0.63 MPa). The lengths of radicle and plumule during the germinating stage were inhibitied by the PEG treatment to about 50% and 85%, respectively. The application of PEG to the seedling of two rice types caused to inhibit the plant height and leaf age about 23 % and 10%, respectively. Shoot and root dry weights by PEG treatment were inhibited more severely in Japonica than those in Indica. The difference on delaying of leaf area expansion between both rice types was not found with treatment of PEG, while the leaf color was increased in both Japonica and Indica by 19.9% and 9.2%, respectively. The average photosynthetic ability was inhibited more in Japonica to 36.0% than did Indica to 27.9%. The stomatal conductance was severely affected by PEG treatment, and the degree was varied in both rice types, ranged with 80-85% in Japonica and 29.3-81.6% in Indica. These results indicate there is little relationship between seed germination and seedling growth under the stress of low water potential.

연구보문 : 벼 이앙재배에서 재식밀도간 질소분시방법에 따른 수량과 미질

최원영 ( Weon Young Choi ),최민규 ( Min Kyu Choi ),고종철 ( Jong Cheol Ko ),김영두 ( Young Doo Kim ),양창휴 ( Chang Hyu Yang ),김택겸 ( Tack Kyum Kim ),김시주 ( Si Ju Kim ) 한국국제농업개발학회 2010 韓國國際農業開發學會誌 Vol.22 No.4

호남평야지에서 중대립 "다미"의 수량 및 품질 향상을 위한 적정 재식밀도 및 질소분시방법을 구명하기 위하여 2007년과 2008년까지 익산 호남농업연구소에서 수행한 내용을 요약하면 다음과 같다. 가. 출수기는 8월 19일로 재식밀도 및 질소분시방법간 차이가 없었다. 나. 재식밀도간 쌀수량과 심백미율은 비슷하였고, 완전미율 은 18.2주가 24.2주/m2 이앙보다 많았으며, 질소분시방법간 쌀 수량은 30:20:50>50:20:30>70:0:30% 순으로 많아 최고수량은 재식밀도 24.2주/m2 이앙에서 질소분시방법은 50:20:30% 이었으며, 백미완전미율은 50:20:30% 분시에서 높았고 단백질함량은 50:20:30<70:0:30<30:20:50% 순으로 낮았다. 이상의 결과로 볼 때, 중대립 "다미"의 품질 향상을 위한 적정 재식밀도는 24.2주/m2 이앙이고 질소분시방법은 50:20:30% 이었다. This study was conducted to establish an optimum planting density and nitrogen split ratio for the improvement yield and quality of transplanting rice in Honam plain region. Field trials were undertaken with rice cultivar "Dami" in experimental paddy fields, located at Iksan, of National Institute of Crop Science in 2007 and 2008. Over two seasons, there were two levels of planting density 18.2 and 24.2 hills m-2 and three levels of nitrogen(N) split application ratio of 30:20:50%, 50:20:30% and 70:0:30%, transplanting:2nd topdressing at tillering stage:3rd topdressing at panicle initiation stage, respectively, of total N(9g m-2) applied. There was no significant in plant growth and yield components by N split ratio under different planting density, and rice yield and the ratio of white core were similar in planting densities. The head rice ratio was higher in 18.2 than 24.2 hills m-2. The rice yield by nitrogen split ratio was higher in the order of 30:20:50>50:20:30>70:0:30%. The top yield of head rice was in 24.2 hills m-2 of planting density with 50:20:30% of nitrogen split ratio. Head rice ratio was highest in 50:20:30% of nitrogen split ratio. The protein content was low in the order of 50:20:30<70:0:30<30:20:50%. These results suggest that an optimum planting density was 24.2 hills m-2 with N split application ratio of 50:20:30%.

연구보문 : 쌀 품위 향상을 위한 중대립 "다미"의 적정 이앙시기 규명

최원영 ( Weon Young Choi ),최민규 ( Min Kyu Choi ),구본일 ( Bon Il Ku ),박홍규 ( Hong Kyu Park ),김영두 ( Young Doo Kim ),고종철 ( Jong Cheol Ko ),고재권 ( Jae Kwon Ko ),유진희 ( Jin Hee Ryu ),김시주 ( Si Ju Kim ) 韓國國際農業開發學會 2009 韓國國際農業開發學會誌 Vol.21 No.3

Development of new on-line statistical program for the Korean Society for Radiation Oncology

Si Yeol Song,MD,PhD,Seung Do Ahn,MD,PhD,Weon Kuu Chung,MD,PhD,Kyung Hwan Shin,MD,PhD,Eun Kyung Choi,MD,PhD,Kwan Ho Cho,MD,PhD 대한방사선종양학회 2015 Radiation Oncology Journal Vol.33 No.2

Purpose: To develop new on-line statistical program for the Korean Society for Radiation Oncology (KOSRO) to collect and extract medical data in radiation oncology more efficiently. Materials and Methods: The statistical program is a web-based program. The directory was placed in a sub-folder of the homepage of KOSRO and its web address is http://www.kosro.or.kr/asda. The operating systems server is Linux and the webserver is the Apache HTTP server. For database (DB) server, MySQL is adopted and dedicated scripting language is the PHP. Each ID and password are controlled independently and all screen pages for data input or analysis are made to be friendly to users. Scroll-down menu is actively used for the convenience of user and the consistence of data analysis. Results: Year of data is one of top categories and main topics include human resource, equipment, clinical statistics, specialized treatment and research achievement. Each topic or category has several subcategorized topics. Real-time on-line report of analysis is produced immediately after entering each data and the administrator is able to monitor status of data input of each hospital. Backup of data as spread sheets can be accessed by the administrator and be used for academic works by any members of the KOSRO. Conclusion: The new on-line statistical program was developed to collect data from nationwide departments of radiation oncology. Intuitive screen and consistent input structure are expected to promote entering data of member hospitals and annual statistics should be a cornerstone of advance in radiation oncology.

림프증식성 질환에서 in situ DNA labeling에 의한 apoptosis 검출과 bcl-2 종양단백 발현

최종원,서진태,강문수,남정현,김진주,배수환,김시영,윤휘중,조경삼 대한임상병리학회 1996 대한임상병리학회지 Vol.16 No.6

尿路感染症에 대한 Aminosidine Sulfate(Gabbromicina)의 臨床報告

金時煌,崔樂圭,朱槿源 中央醫學社 1974 中央醫學 Vol.26 No.2

The effects of Aminosidine sulfate in the treatment of urinary tract infections were evaluated in the Dept. of Urology, Seoul National University Hospital from May 1 to September 30, 1973. Fifteen cases of acute gonococcal urethritis, 5 cases of acute non-gonococcal urethritis, 8 cases of acute cystitis and 5 cases of acute pyelonephritis were subjected in this study. All cases were injected 1 gm of Aminosidine sulfate intramuscularly and the treatment period was 3-10 days according to the responses of the drug to the diseases. The success of treatment were based on the subsidence of subjective symptoms. and negative bacteriological study at least until 7 to 10 days after treatment. The cure rate was 86.7% for N. gonorrhea, 100% for staphylococcus aureus, 92.3% for E. coli and 50% for no organism(acute non-gonococcal urethritis), and overall cure rate was 86.7%. No particular side effects or reactions were observed during Aminosidine treatment except severe pain on injection site in 10 cases.