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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.
화분관 (花紛管) In Vitro 생장의 굴수성에 (屈水성) 대하여
곽병화 (Beyoung Hwa Kwack) 한국식물학회 1971 Journal of Plant Biology Vol.14 No.2
Zephyranthes candida, Narcissus pseudonarcissus and Crinum asiaticum pollen were placed near their pistil parts respectively on agar cultural media (microslides) containing 10% sucrose and 100㎎/1 boric acid plus 1% agar with or without calcium and some other calcium-supporting inorganic salts. If fresh pistils (100% moisture) were used pollen grew toward their pistil parts, showing positive tropism. This was also true when combinations among three different species were made. Pollen tubes grew away from the pistils if they were dried (below 10% moisture), showing negative tropism. Pollen could not show sny tropic growth and thus grew at random of all directions if the pistil parts were incompletely dried (approximately 50% moisture). The similar tropic responses of pollen-tube growth with the three species could be demonstrated with either wet or dried tooth-pick segments. Calcium ions in the basic medium merely promated pollen-tube growth and so eitherpositive or negative tropism became rather distinctive, but they were not tropically active. Pollen tubes grow toward pistil parts with more moisture content and seem to be hydrotropically sensitive. This was assumed due to the cohesive force existing in water molecules.
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.
콩과식물화분의 Leucine Aminopeptidase 검출과 그 Isozyme 에 대하여
곽병화 (Beyoung Hwa Kwack) 한국식물학회 1970 Journal of Plant Biology Vol.13 No.2
Identification and observations of leucine aminopeptidase (LAP) and multiple molecular forms of the enzyme, isozymes, were made with a technique of starch-gel eletrophoresis for various legume pollen. Plants tested other tnan Leguminosae demonstrated either no indication of the presence or at least trace of the enzyme and the isozymes, although all legume pollen tested showed strong LAP patterns. The electrophoretic patterns of LAP failed to be shown if the extracts were heated or otherwise denatured. Extent of zymogrammatic appearance of LAP and the isozymes were characteristic of a species.