Abstract
The oscillatory responses of a single leaf of sweet potato are examined under lighting by a fluorescent light in a uniform airflow. The leaf displacement is measured using a laser displacement detector, and the power spectrum of the data is calculated. The equilibrium position is changed as a function of time when the light is leaved on for one hour and after tuned off. The primary resonant frequency of the leaf has shifted to higher range, and its magnitude of the power spectrum has increased during the experiments. These dynamic characteristics are due to the deformation of the leaf shape by the phototropism. These responses also suggest the influence of the airflow, because the evaporation from the leaf is activated. Future study is directed to examine the various lighting effects, on plant holophyte.
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