Studies on Leaf Orientation Movements in Kudzu (Pueraria lobata) (I) : Diurnal Changes of Leaflet Azimuth and Leaf Temperature

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  • Liu H. K.
    Department of Forestry, Faculty of Agriculture, Kyushu University
  • Gyokusen Koichiro
    Department of Forestry, Faculty of Agriculture, Kyushu University
  • Saito Akira
    Department of Forestry, Faculty of Agriculture, Kyushu University

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Other Title
  • クズの葉の調位運動に関する研究(I) : 小葉の方位調節と葉温の日変化
  • クズの葉の調位運動に関する研究(1)小葉の方位調節と葉温の日変化
  • クズ ノ ハ ノ チョウイ ウンドウ ニカンスルケンキュウ 1 ショウヨウ ノ

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Abstract

The type of leaf movement and its effect on leaf temperature in Kudzu (Pueraria lobata), a leguminous vine, was studied. The change in the size of the projection area formed by the leaf on a grid surface below it was used to measure leaf orientation movement. Variation in the size of the area projected by each leaf during the day was large in the morning and at dusk, but was very small at midday. From these findings it can be deduced that the Kudzu leaf takes in sunlight through diaheliotropic movement in the morning and at dusk; but takes shelter from strong solar radiation through paraheliotropic movement at midday. Furthermore, it was observed that the leaf moves with regularity and that leaf changes its orientation with one fixed point on the leaf as the axis. Comparing the leaf temperature of a natural leaf with an artificially fixed one, it was determined that there was no significant difference in the leaf temperature of both leaves while the natural leaf undergoes diaheliotropic movement. However, the temperature of the natural leaf was 4℃ lower than that of the fixed leaf during paraheliotropism. This reveals that leaf orientation movement in Kudzu functions to reduce leaf temperature.

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