大豆不同生育期的叶取向现象

Soybean Leaflet Orientation During Different Growth Stage

通过盆栽实验,观察了“丹豆5号”大豆叶取向现象。结果表明:趋日运动和避日运动共存于“丹豆5号”叶片。水分适宜条件下,叶片营养生长期以趋日运动为主,生殖生长期以避日运动为主。水分胁迫诱导并加剧避日运动。证明叶取向运动系大豆适应强光和水分亏缺的重要方式。

Potted experiments were carried out on Dan No. 5 (Glycine maxL. ) to observe leaflet orientation. The results showed that both diaheliotropism and parahe-liotoopism existed. Under the well-watered conditions , terminal leaflets were generally sun-tracking during the vegetative stage, whereas leaflets tended to be sun-avoiding during the pod filling stage. With the development of water stress, paraheliotropism was substantially induced and became more obvious. It was proved that leaflet orientation is the main mechanism of soybean for adapting to water stress and high light intensity.