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강동진,石井龍一,이인중 慶北大學校 農業科學技術硏究所 2003 慶北大農學誌 Vol.21 No.-
Plants are often subjected to periods of soil and atmospheric water deficit during their life cycle. To find critical levels for identification of tolerant rice variety to salt- and drought-stresses, we investigated the water deficiency in the leaf of a Dongjinbyeo (DJ) cultivar, identified as intolerant variety, subjected to NaCl- and Polyethylene glycol 6000 (PEG)- treatments. The relative water content and water potential in leaf of DJ plant sharply declined along the high concentration and time after treatment in NaCl- and PEG-treated rice plants. To elucidate the method of simple screening of tolerant variety to salt- and drought-stresses, we examined the relationship between relative water content and water potential of leaves in NaCl- and PEG-treated rice plants. The relationship between relative water content and water potential in leaf of DJ plant showed the highest correlation in 80 mM NaCl-treatment, and showed high correlation only 8% PEG treatment. These results indicate that the critical level of salt stress for screening of tolerant rice was 80 mM NaCl at 48 h after NaCl treatment, and the critical concentration of drought stress for screening of tolerant rice was 8% PEG at 96 h after PEG treatment.
엽중수분 변화가 잎담배 품종간 호흡과 광합성속도에 미치는 영향
Seong Kook Bae,Ryuichi Ishii,Atsuhiko Kumura 韓國作物學會 1985 Korean journal of crop science Vol.30 No.4
품종간 엽중수분변화에 대한 광합성과 호흡에 미치는 영향을 밝히기 위하여 온실에서 자란 잎담배 5품종의 엽중수분함량을 변화시켜서 광일광합성속도, 호흡속도, 기공저항 및 엽육저항을 각각 조사한 결과를 요약하면 다음과 같다. 1. 품종간 광합성속도는 N. longiflora가 20.7mg CO2 /dm2 /hr로 제일 컸고 Burley종이 제일 적었다. 2. 광합성속도와 단위엽면적당 건물중과는 정의 상관을 보였다. 3. 안동엽은 WSD 53%에서 광합성속도가 50%정도 감소되었으나 Burley 21은 외관상으로 위조상태 이전인 WSD 43%에서 광합성능력을 상실하여 재배품종은 N. longiflora와 안동엽보다 수분결핍에 의해 광합성 작용이 크게 억제되었다. 4. 품종간 호흡속도의 변화는 수분결핍 초기에 약간 증가하다가 광합성속도와 같은 경향으로 감소하였다. 5. 수분결핍에 따라 기공저항과 엽육저항은 증가되었으며 수분결핍에 의한 광합성속도의 감소는 주로 기공이 닫혀지기 때문으로 본다. The effect of leaf water content on apparent photosynthesis and respiration of tobacco plants(five varieties) was studied under the condition without the irrigation for 10 days after the plants were sufficiently watered on the first day. The wild race (N. longiflora) among varieties showed highest apparent photosynthesis (AP) and AP had a positive correlation with specific leaf weight. N. longiflora and Andongyeob were different in their AP from the other varieties significantly under the water stress condition. Respiration rate also decreased to be simillar to AP except slight increase at early stage of water deficit. The stomatal resistance and the mesophyll resistance increased in the stressed plants. The water stress resistant character seems to be mainly due to open stomata.
Kiyomi Matsuo,Shigeyuki Ishii,Ryuichi Iiboshr,Koji Yamaguchi,Park Jinyong 한국재활복지공학회 2011 한국재활복지공학회 학술대회논문집 Vol.2011 No.11
We developed desorption type wheelchair electric-ized equipment. Since [, such as muscular power and tenacity ] it is weak, this equipment can move a short distance with a manual wheelchair, but the way with many the times of going to a distance and slopes is aimed at the direction which cannot carry out independence movement. Or when a manual wheelchair is driven, it will be aimed at the direction it becomes impossible to move by fatigue or a pain if it arrives at the destination. If this is used, without needing big muscular power and tenacity, it becomes independent and can move to the destination. Moreover, since it not only becomes small, but can move manually if it arrives at the purpose and this equipment will be removed, the approach to a toilet, a restroom, a table, etc. is also easy.
Screening of Submergence-Tolerant Rice Varieties and their Physiological Characteristics
강동진,박동수,이종희,Byung Geun Oh,Ryuichi Ishii,In Jung Lee 한국작물학회 2004 Korean journal of crop science Vol.49 No.3
This study is to identify the physiological traits of submergence-tolerant varieties of rice plants (Oryza sativa L.) in Yeongnam province, southeastern part of Korea, where the yield reduction of rice plants due to submergence is remarkably severe. In the present study, two tolerant varieties of rice plants were selected from over 30 grown in under a 10-day period. The tolerant varieties came from a submerged paddy field. As a control, one intolerant variety of rice plant was chosen. Of the tolerant variety Samgangbyeo, rather than Haepyungbyeo, had a lower dissolved oxygen consumption and maintained a higher dry weight than the intolerant variety. The leaf photosynthetic rates (LPS) of the two tolerant varieties were significantly higher than that of the intolerant-variety after four days of submergence treatment. These results indicate that lower dissolved oxygen consumption in a limited pool is prevented by ethylene formation in the tolerant varieties, which may be a mechanism of submergence tolerance.
Dong-Jin Kang,Young-Jin Seo,Koichi Futakuchi,Pisoot Vijarnsorn,Ryuichi Ishii 한국작물학회 2011 Journal of crop science and biotechnology Vol.14 No.4
Aluminum is a major phytotoxic mineral in the soil at low pH conditions. The effect of aluminum (Al) on root length, flowering time, dry matter production, and grain yield was examined using two tolerant, Pungsan (PS) and Geumgang (GG), and one susceptible,IR36, rice varieties to acid soil. Rice seedlings were subjected to two Al treatments (+Al, 150 μM of Al; –Al, 0 μM of Al) in solution culture, where pH was always adjusted at 3.5. PS and GG showed significantly larger root length than IR36 in +Al at 2 and 8 weeks after the treatment (WAT). Flowering time was delayed 9 days in +Al compared to –Al in GG and PS and 27 days in IR36. Dry matter weight and grain yield of GG and PS were also significantly higher than those of IR36 under +Al. The inhibition of such agronomic traits by Al toxicity was less in Al- tolerant varieties than in a susceptible variety.
Identification and Crop Performance of Acid Sulfate Soil-tolerant Rice Varieties
Dong-Jin Kang,Young-Jin Seo,이병규,Pisoot Vijarnsorn,Ryuichi Ishii 한국작물학회 2010 Journal of crop science and biotechnology Vol.13 No.2
The present study aims to: 1) identify acid sulfate soil (ASS)-tolerant rice varieties from the genetic stock of Korean rice (Oryza sativa L.) varieties under ASS conditions; 2) to evaluate their yield performance, and elucidate the physiological mechanism for ASS tolerance with the identified tolerant varieties. Two hundred sixty-six rice varieties were screened for ASS tolerance, and we identified two japonica-indica hybrid varieties, Geumgang (GG) and Pungsan (PS), as having high tolerance under ASS paddy conditions (pH 3). We first conducted a yield trial of GG and PS grown in Wagner pots to determine their potential yields under ASS conditions. A yield trial under paddy field condition followed. In the pot experiment, the ASS-tolerant varieties, GG and PS, showed significantly higher yields than PT-1, which is a local reference variety in mildly improved soil pH conditions (pH 4.1-4.6). Al and Fe content in GG and PS were significantly lower than that of PT-1, so there might be some mechanism that inhibits the absorption of toxic metal ions in the tolerant varieties. In the paddy conditions, the grain yields more than 5 t ha-1 of the two tolerant varieties under mildly improved soil pH condition were significantly higher than PT-1. Dry matter weights of above ground parts also showed the same trend as grain yield. The study demonstrated that the ASS-tolerant japonica-indica rice varieties with high yielding potential could contribute to the improvement of rice yield in ASS regions, and will be good materials for the development of acid soil-tolerant rice varieties.