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CENTRORADIALIS-LIKE1 (CENL1), a poplar ortholog of Arabidopsis thaliana TERMINAL FLOWER1 (TFL1), was markedly downregulated in the wild-type apex coincident with SD-induced growth cessation. By contrast, poplar overexpressing a heterologous Avena sativa PHYA construct (P35S:AsPHYA), with PHYA accumulating in the rib meristem (RM) and adjacent tissues but not in the shoot apical meristem (SAM), upregulated CENL1 in the RM area coincident with an acceleration of stem elongation. In SD-exposed heterografts, both P35S:AsPHYA and wild-type scions ceased growth and formed buds, whereas only the wild type assumed dormancy and P35S:AsPHYA showed repetitive flushing. This shows that the transition is not dictated by leaf-produced signals but dependent on RM and SAM properties. In view of this, callose-enforced cell isolation in the SAM, associated with suspension of indeterminate growth during dormancy, may require downregulation of CENL1 in the RM. Accordingly, upregulation of CENL1\/TFL1 might promote stem elongation in poplar as well as in Arabidopsis during bolting. Together, the results suggest that the RM is particularly sensitive to photoperiodic signals and that CENL1 in the RM influences transition to dormancy in hybrid poplar.<\/jats:p>","DOI":"10.1105\/tpc.107.056721","type":"journal-article","created":{"date-parts":[[2008,1,12]],"date-time":"2008-01-12T01:54:43Z","timestamp":1200102883000},"page":"59-74","source":"Crossref","is-referenced-by-count":113,"title":["<i>CENL1<\/i>Expression in the Rib Meristem Affects Stem Elongation and the Transition to Dormancy in<i>Populus<\/i>"],"prefix":"10.1093","volume":"20","author":[{"given":"Raili","family":"Ruonala","sequence":"first","affiliation":[{"name":"Plant Biology, Department of Biological and Environmental Sciences, University of Helsinki, FI-00014 Helsinki, Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pa\u0308ivi L.H.","family":"Rinne","sequence":"additional","affiliation":[{"name":"Department of Plant and Environmental Sciences, Norwegian University of Life Sciences, N-1432 A\u030as, Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jaakko","family":"Kangasja\u0308rvi","sequence":"additional","affiliation":[{"name":"Plant Biology, Department of Biological and Environmental Sciences, University of Helsinki, FI-00014 Helsinki, Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christiaan","family":"van der Schoot","sequence":"additional","affiliation":[{"name":"Department of Plant and Environmental Sciences, Norwegian University of Life Sciences, N-1432 A\u030as, Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2008,1,11]]},"reference":[{"key":"2021040620344372000_b1","doi-asserted-by":"crossref","first-page":"1825","DOI":"10.1139\/b91-232","volume":"69","year":"1991","journal-title":"Can. 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