Leaf-opening substance in the nyctinastic plant, Albizzia julibrissin Durazz
Ueda, M. (Keio Univ., Yokohama (Japan). Faculty of Science and Technology) | Sawai, Y. | Shibazaki, Y. | Tashiro, C. | Ohnuki, T. | Yamamura, S.
cis-p-Coumaroylagmatine (T) was isolated from Albizzia julibrissin Durazz, a cyctinastic punt, as a leaf-opening substance. The compound was quite effective for opening the plant leaves at 5 x 10(-6) M at night, but was not effective for other nyctinastic plants. The bioactive fraction with leaf-closing activity was also Separated from the plant extract. Although the leaf-opening activity of the punt extract changed between the day and night, the content of 1 was almost constant through a 24-h day. These results suggest that the change in content of an unknown leaf-closing factor induced balance between the two leaf-movement factors through a 24-h day
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