Circadian leaf movements in biloxi soybeans.

Leaf movement in Biloxi soybean has been investigated in some detail by Bunning (1) and Holdsworth (2). The results and the interpretations presented by these investigators differ with regard to the nature of the leaf movement response. Bunning considers the leaf movement to be a circadian manifestation of the physiological clock, while Holdsworth considers it to be essentially a photonastic response. The purpose of this investigation is to determine more precisely the nature of the leaf movement response.