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논문 기본 정보

자료유형
학술저널
저자정보
Miah, Mohammad Idrish (School of Biomolecular and Physical Sciences, Griffith University) Johnsson, Anders (Biophysics Laboratory, Department of Physics, Norwegian University of Science and Technology)
저널정보
한국식물학회 식물학회지 식물학회지 제50권 제4호
발행연도
2007.1
수록면
480 - 483 (4page)

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초록· 키워드

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Rhythmic up-down movements were studied in the lateral leaflets of Desmodium gyrans (L.F.) DC. These were recorded with a video-computer system, whereby the digital video signals from a CCD camera were processed with special software. Under control conditions ($24^{\circ}C\;and\;0.1nM\;cm^{-2} s^{-1}$ of stable, dim light), the average period of lateral leaflet movement was 3.5 min. In the presence of light stimuli (for 2 min), those leaflets always moved toward the light, regardless of where it was applied to any axial part of the pulvinus. The strongest effect was manifested by a reduced amplitude of movement and, thus, a shortened period, which could be up to ${\sim}43%$ less under moderate light intensity $(5nM cm^{-2} s^{-1})$. Oscillations regained their original regularity over ${\sim}10$ cycles after the light stimulus was removed. In addition, these oscillations temporarily disappeared after long exposure $({\sim}10 min)$ under moderate light, or when the leaflets were quickly exposed to a higher intensity $({\sim}12nM\;cm^{-2}s^{-1})$. Therefore, we have now demonstrated that light can affect physiological parameters that are involved in the control of oscillations.

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