In vivo reorganization of the actin cytoskeleton in leaves of Nicotiana tabacumL. transformed with plastin-GFP. Correlation with light-activated chloroplast responses

Abstract

The architecture of the actin cytoskeleton in the mesophyll of tobacco is significantly modulated by strong light. This modulation does not affect the direction of chloroplast redistribution in the cell. Calcium ions have multiple functions in the mechanism of the movements. Our results suggest also that Mg(2+) is a regulatory molecule cooperating with Ca(2+) in the signaling pathway of blue light-induced tobacco chloroplast movements.