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クズの葉の調位運動が単葉の光合成速度に及ぼす影響を水平に固定した葉と自然葉の光合成速度とを比較することで検討した．固定葉と自然葉の光合成速度を比較すると，固定輩が自然葉よりも低い場合と自然葉と変わらない場合の2つの事例が認められた．これらの事例を再現するために，全体葉に対する固定葉の面積割合を変えて光合成速度を測定したところ，固定葉割合が多い場合にのみ光合成速度が低下することが確認された．このこと...から，調位運動の停止は直接的には光合成速度に影響しないが，光合成以外の生理活性に変化が生じ，これにより二次的に光合成速度を低下させていると考えられた．生理的な変化として水分ストレスの増大が考えられたので，固定葉と自然葉との茎内の樹液流量を比較した．その結果，調位運動の停止はクズの葉の水消費量を平均2倍に増加させており，このことから，調位運動の停止は水ストレスの増大を引き起こし，その結果光合成速度の低下をもたらすことが示唆された．
The effect of changes in leaf orientation of kudzu (Pueraria lobata) on leaf photosynthesis was determined by artificially fixing leaves horizontally and comparing photosynthetic rate to that of the unrestrained leaf allowed leaf orientation movement. Comparing photosynthesis of fixed and natural leaves, it was determined that in some instances, photosynthetic rate of fixed leaves did not differ significantly from natural leaves. However, at times, fixed leaves had a lower photosynthetic rate than natural ones. Because of this, the ratio of fixed to natural leaves for the whole plant was varied. It was determined that only when the proportion of fixed leaves was high did leaf photosynthetic rate decrease. These findings indicate that restraining leaf orientation movement does not affect photosynthetic rate directly. However, changes in physiological processes other than photosynthesis may lead to lower photosynthetic performance. Since physiological changes resulting from water stress may have a great effect on leaf photosynthetic rate, the sap flow of stems of both fixed and natural leaves was measured. It was found that prevention of leaf movement in kudzu increased transpiration by an average of two times, resulting from water stress, suggesting one cause for the decline in photosynthesis.show more
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