Abstract
Most leguminous plants close their leaves in the evening, as if to sleep, and open them early in the morning. This circadian rhythm is known to be controlled by the biological clock of such plants. Extensive studies on other nyctinastic plants led to the isolation of a variety of leaf-closing and leaf-opening substances. And, we found that the circadian rhythmic leaf-movement of these plants is controlled by a biological clock that regulates the balance of concentration between leaf-opening and -closing substances.
Highlights
In contrast with animals, plants are rooted and unable to move from one place to another by themselves
This review focuses on a variety of bioactive compounds related to the leaf movement of nyctinastic plants, whose leaves close at night and open in the daytime according to a circadian rhythm
We revealed that there exist leaf-opening substances together with leaf-closing ones in every nyctinastic plant
Summary
Plants are rooted and unable to move from one place to another by themselves. This review focuses on a variety of bioactive compounds related to the leaf movement of nyctinastic plants, whose leaves close at night and open in the daytime according to a circadian rhythm. The presence of leaf-opening substances indicates that nyctinastic movement is controlled by the change in the concentration of the leaf-closing factor, and by the competitive interaction between leaf–closing and leaf–opening substances.
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