Figure 2.

Models proposed for actin-based motility of nucleus and chloroplast. (A) Nuclear movement along an actin bundle. Upon strong blue-light irradiation, the nucleus (blue) starts to move along the actin bundle (black) toward the anticlinal wall (brown). (B) Nuclear movement following lateral movement of an actin bundle. The nucleus is anchored statically to the actin bundle, which laterally moves toward the anticlinal wall under strong blue light, enabling the nucleus to reach the anticlinal wall. (C) Chloroplast movement using the cp-actin filaments. In strong blue light, evenly distributed cp-actin filaments (black) become biased to increase at the leading edge of the chloroplast (green) with the onset of chloroplast movement (adopted from Kadota et al. 2009). Red arrows indicate the moving direction of the nucleus and chloroplast.