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수도 (水稻) IR 667 의 적고현상에 미치는 질소의 영향에 관한 연구
곽병화(Beyoung Hwa Kwack),구영서(Yung Suh Koo) 한국식물학회 1971 Journal of Plant Biology Vol.14 No.4
Pot and paddy field tests were conducted to study red discoloration of rice var. IR 667 leaves with reference to the leading Korean native variety Jinhung and Paldal, with the following results: 1. Minor elements such as Mn, Fe, B, Al, Ca and Si had no influence on the discoloration, but a supply of various soluble nitrogen compounds completely restricted it. The more prosperous the growth of IR 667 with nitrogen, the more severe the discoloration appears when nitrogen absorption becomes limited. 2. Chlorotic pigments extracted from both IR 667 and Jinhung were compared spectrophotometrically, and found to have different spectral peaks. IR 667 had peak closer to red than Jinhung, indicating the characteristic of the variety. IR 667 was observed to be more sensitive to nitrogen deficiency than Jinhung or the other japonica variety. 3. It was concluded that all the factors limiting nitrogen supply for IR 667 growth, such as low nitrogen application, restriction of root respiration (low temperature, poor drainage, toxic gases or substances in the root zone, etc.) and pest injuries, would result in the appearance of the so-called red discoloration, because of the reduction in nitrogen uptake. Since, the discoloration of IR 667 is varietal characteristic when grown in Korea, control of it may be beneficial cultural practice in increasing grain yield, although the increased succeptibility to pests and a drop in the rate of maturity due to relatively high nitrogen level in the leaves may result in an unexpected drop in yield. It is anticipated that further exploration conducted from practical point of view will establish the relationships between the extent of red discoloration, nitrogen availability and grain yield in IR 667.
In Sem - Vitro 달맞이꽃화분 (花紛) 의 석회에 의한 생장촉진과 DNP 및 저온의 그 억제작용에 관하여
곽병화(Beyoung Hwa Kwack),윤경은(Kyung Eun Yoon) 한국식물학회 1969 Journal of Plant Biology Vol.12 No.2
The promotive effect of Ca in semi-vitro culture of Oenothera biennis pollen was by and large identical to that of in vitro systems. This promotive effect became additive when boron was supplemented to the media and even more so if K was further supplemented. No such Ca action waa observed when performed under the conditions of relatively low temperature. An uncoupling agent of ATP in respiration, DNP, inhibited the promotive action of B, but not that of Ca. The inhibitory effect of DNP was greater at low temperatures. IAA was rather inhibitory on pollen growth in semi-vitro culture, even much greater than it if DNP was supplemented to the IAA-containing media.
대두유축신장에 (大豆幼軸伸長) 미치는 각종생장 조절물질과 석회 및 가리의 (加里) 생리적작용에 대하여
곽병화(Beyoung Hwa Kwack),윤경은(Kyung Eun Yoon) 한국식물학회 1968 Journal of Plant Biology Vol.11 No.1
Hrpocotyl segments of shade-grown soybean sprouts (var. Kumdo) were floated in solutions of various substances at physiological levels and grown for either 24 hours at 28℃ or 72 hours at 25℃. Increased length of the segments beyond 20㎜ (the original length) was obtained as a measure of the present studies. At the room temperature, Ca and DNP strong1y inhibited elongation of the hypocotyl segments, whereas K, IAA. GA and EDTA in general promoted it. There were, however, no such differences in the effects at relatively low temperature. This indicated that the elongation process not only involves stretching of wall materials, but also does synthesis of the materials. Ca was found to be antagonistic to the promotive action of GA in the elongation, and the IAA action involves metabolic energy. EDTA seemed to act as a widely known chelator removing Ca already existed in the hypocotyl tissue, thus showed a promotion in the elongation.