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Actin cytoskeleton in Arabidopsis thaliana under blue and red light

Background information. Actin cytoskeleton is the basis of chloroplast‐orientation movements. These movements are activated by blue light in the leaves of terrestrial angiosperms. Red light has been shown to affect the spatial reorganization of F‐actin in water plants, where chloroplast movements are closely connected with cytoplasmic streaming. The aim of the present study was to determine whether blue light, which triggers characteristic responses of chloroplasts, i.e. avoidance and accumulation, also influences F‐actin organization in the mesophyll cells of Arabidopsis thaliana. Actin filaments in fixed mesophyll tissue were labelled with Alexa Fluor® 488‐conjugated phalloidin. The configuration of actin filaments, expressed as a form factor (4π·area/perimeter2), was determined for all actin formations which were measured in fluorescence confocal images.