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논문 기본 정보

자료유형
학술저널
저자정보
Yi Hoonbok (Department of Biological Science, Minnesota State University, Bio-Evaluation Center, Korea Research Institute for Bioscience and Biotechnology) Yi Myoung-ae (Department of Biological Science, Minnesota State University) Choe Hyung T. (Department of Biological Science, Minnesota State University)
저널정보
한국식물학회 식물학회지 식물학회지 제48권 제4호
발행연도
2005.1
수록면
429 - 439 (11page)

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Lipoxygenase (LOX), one of the main oxidative catalysts in plants, is involved in the regulation of growth and senescence. We investigated changes in LOX activity or its properties as they related to the development of oat plants at four stages (germination, growth, natural senescence, and dark-incubated senescence). LOX activity was high during early growth and at senescence. At pH 4.5, activity showed an abrupt surge compared with a normal enzyme reaction pattern at pH 6.5. The optimum reaction temperature was $25^{\circ}C$ ; LOX and peroxidase exhibited similar activity patterns. Polyacrylamide gel electrophoresis revealed that the purified LOX consisted of three isoenzymes in germinating seeds, two in growing seedlings, and three during both natural and dark-induced senescence. As determined by isoelectric focusing, the isoelectric points (pI) of LOX ranged from 3.6 to 6.5 throughout the four developmental stages; for natural or dark-induced senescence, the pi was 9.0.

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