Phototropin-dependent biased relocalization of cp-actin filaments can be induced even when chloroplast movement is inhibited

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Abstract

In a recent publication using an actin-visualized line of Arabidopsis (Ichikawa et al. 2011), we reported a detailed analysis with higher time resolution on the dynamics of chloroplast actin filaments (cp-actin filaments) during chloroplast avoidance movement and demonstrated a good correlation between the biased configuration of cp-actin filaments and chloroplast movement. However, we could not conclusively determine whether the reorganization of cp-actin filaments into a biased configuration preceded actual chloroplast movement (and thus, whether it could be a cause of the movement). in this report, we present clear evidence that the reorganization of cp-actin filaments into a biased distribution is induced even in the absence of the actual movement of chloroplasts. When the cells were treated with 2,3-butanedione monoxime (BDM), a potent inhibitor of myosin ATPase, chloroplast motility was completely suppressed. Nevertheless, the disappearance and biased relocalization of cp-actin filaments toward the side of the prospective movement direction were induced by irradiation with a strong blue light microbeam. the results definitively indicate that the reorganization of cp-actin filaments is not an effect of chloroplast movement; however, it is feasible that the biased localization of cp-actin filaments is an event leading to chloroplast movement. © 2011 Landes Bioscience.

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Yamada, N., Suetsugu, N., Wada, M., & Kadota, A. (2011). Phototropin-dependent biased relocalization of cp-actin filaments can be induced even when chloroplast movement is inhibited. Plant Signaling and Behavior, 6(11), 1651–1653. https://doi.org/10.4161/psb.6.11.17767

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