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The aim of this work was to study the relationship between chloroplast responses and the organization of actin cytoskeleton in living tobacco cells. Chloroplast movements were measured photometrically as changes in light transmission through the leaves. The actin cytoskeleton, labeled with plastin-GFP, was visualised by confocal microscopy.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Results<\/jats:title>\n            <jats:p>The actin cytoskeleton was affected by strong blue and red light. No blue light specific actin reorganization was detected. EGTA and trifluoperazine strongly inhibited chloroplast responses and disrupted the integrity of the cytoskeleton. This disruption was reversible by Ca<jats:sup>2+<\/jats:sup> or Mg<jats:sup>2+<\/jats:sup>. Additionally, the effect of trifluoperazine was reversible by light. Wortmannin, an inhibitor of phosphoinositide kinases, potently inhibited chloroplast responses but did not influence the actin cytoskeleton at the same concentration. Also this inhibition was reversed by Ca<jats:sup>2+<\/jats:sup> and Mg<jats:sup>2+<\/jats:sup>. Magnesium ions were equally or more effective than Ca<jats:sup>2+<\/jats:sup> in restoring chloroplast motility after treatment with EGTA, trifluoperazine or wortmannin.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Conclusion<\/jats:title>\n            <jats:p>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<jats:sup>2+<\/jats:sup> is a regulatory molecule cooperating with Ca<jats:sup>2+<\/jats:sup> in the signaling pathway of blue light-induced tobacco chloroplast movements.<\/jats:p>\n          <\/jats:sec>","DOI":"10.1186\/1471-2229-9-64","type":"journal-article","created":{"date-parts":[[2009,5,29]],"date-time":"2009-05-29T20:26:18Z","timestamp":1243628778000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":30,"title":["In vivo reorganization of the actin cytoskeleton in leaves of Nicotiana tabacumL. transformed with plastin-GFP. 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