Required for chloroplast photorelocation movement; chloroplast accumulation upon low blue light and for chloroplast movement to the bottom of cells in darkness, by modulating chloroplast actin (Cp-actin) filaments distribution, appearance and disappearance. May mediate a slight resistance to aluminum in root hair cells. Expressed in leaves and stems, but not in roots. The J domain co-chaperone activity is required for chloroplast photorelocation movement. Lacks the chloroplast accumulation response under weak blue light and chloroplast movement in darkness, but shows a normal avoidance response under strong blue light. Non biased distribution of chloroplast actin (Cp-actin) filaments.