
%0 Journal Article
%A Scott, BIH 
%A Gulline, HF 
%T Natural and Forced Circadian Oscillations in the Leaf of Trifolium Repens
%J Australian Journal of Biological Sciences
%D 1972/02/01
%V 25
%N 1
%P 61-76
%K 
%R https://doi.org/10.1071/BI9720061
%U https://www.publish.csiro.au/paper/BI9720061 
%X The leaves of white clover (T. repens) exhibit typical circadian characteristics with an endogenous period, T, of 25-27 hr. Oorresponding oscillations are observed of the torque exerted by leaflets prevented from closing. The mean variation in torque during a cycle was 339 ± 13 dyne cm. When leaves were subjected to light-dark cycles at constant temperature, entrainment was obtained for periods from 0·7 to 1· 4T. Phase shifts were observed ranging from a lag of 40° for O' 7T to an advance of 130° for 1· 4T. The pulvinus was shown to be both the photoreceptor and the site of the endogenous timer. 
