Abstract
We have monitored the effect of photo-environment on the circumnutation of Arabidopsis thaliana (Columbia) flower stalk using time-lapse monitoring. Under continuous white light condition, the frequency of flower stalk circumnutation is high, with low degree of stalk curvature, while the opposite is true in the case of dark condition. Intensity of light modulates the frequency of circumnutation in a dose dependent manner under white, red and blue light conditions. In general, the frequency of circumnutation decreased with decreasing light intensity. However, under blue light condition, the frequency of circumnutation was lower than that of red light condition at any given intensity. It is believed that the circumnutation is an autonomic growth movement, which is not affected by external stimuli, but in the present study, we obtained a clear indication that flower stalk circumnutation in A. thaliana is affected by external photo-environmental changes.
