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The metabolites exported from brightly illuminated chloroplasts spread along the internode with the liquid flow and cause transient changes in chlorophyll fluorescence at cell areas that are exposed to dim light or placed shortly in darkness. The largest distance to which the photometabolites can be transported has not yet been determined. Neither is it known if lateral transport has an influence on the induction of chlorophyll fluorescence. In this study, the relations between spatial connectivity of anchored chloroplasts in characean internodes and fluorescence induction curves were examined. Connectivity between remote cell parts was pronounced upon illumination of a cell spot at a distance up to 10\u2009mm from the area of fluorescence measurement, provided the spot was located upstream in the cytoplasmic flow. Spatial interactions between distant cell sites were also manifested in strikingly different slow stages of fluorescence induction caused by narrow\u2010 and wide\u2010field illumination. Cytochalasin D, cooling of bath solution, and inactivation of light\u2010dependent envelope transporters were used to disturb cyclosis\u2010mediated spatial interactions. Although fluorescence induction curves induced by narrow\u2010 and wide\u2010field illumination differed greatly under control conditions, they became similar after the inhibition of cyclosis with cytochalasin D. The results indicate that cytoplasmic streaming not only drives the lateral translocation of photometabolites but also promotes the export of reducing power from illuminated chloroplasts due to flushing the chloroplast surface and keeping sharp concentration gradients.<\/jats:p>","DOI":"10.1111\/ppl.13531","type":"journal-article","created":{"date-parts":[[2021,8,20]],"date-time":"2021-08-20T08:00:06Z","timestamp":1629446406000},"page":"1901-1913","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Effects of chloroplast\u2013cytoplasm exchange and lateral mass transfer on slow induction of chlorophyll fluorescence in Characeae"],"prefix":"10.1111","volume":"173","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3131-8890","authenticated-orcid":false,"given":"Alexander A.","family":"Bulychev","sequence":"first","affiliation":[{"name":"Department of Biophysics, Faculty of Biology Moscow State University  Moscow 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