Document Detail

CENL1 expression in the rib meristem affects stem elongation and the transition to dormancy in Populus.
MedLine Citation:
PMID:  18192437     Owner:  NLM     Status:  MEDLINE    
We investigated the short day (SD)-induced transition to dormancy in wild-type hybrid poplar (Populus tremula x P. tremuloides) and its absence in transgenic poplar overexpressing heterologous PHYTOCHROME A (PHYA). 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.
Raili Ruonala; Päivi L H Rinne; Jaakko Kangasjärvi; Christiaan van der Schoot
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-01-11
Journal Detail:
Title:  The Plant cell     Volume:  20     ISSN:  1040-4651     ISO Abbreviation:  Plant Cell     Publication Date:  2008 Jan 
Date Detail:
Created Date:  2008-03-03     Completed Date:  2008-05-15     Revised Date:  2010-09-22    
Medline Journal Info:
Nlm Unique ID:  9208688     Medline TA:  Plant Cell     Country:  United States    
Other Details:
Languages:  eng     Pagination:  59-74     Citation Subset:  IM    
Plant Biology, Department of Biological and Environmental Sciences, University of Helsinki, FI-00014 Helsinki, Finland.
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MeSH Terms
Cell Separation
Flowers / genetics
Gene Expression Regulation, Plant
Genes, Plant
Hybridization, Genetic
Membrane Potentials
Meristem / cytology,  metabolism*
Phytochrome A / genetics,  metabolism
Plant Proteins / metabolism*
Plant Stems / growth & development*
Populus / cytology,  genetics,  growth & development*,  metabolism*
RNA, Messenger / genetics,  metabolism
Reg. No./Substance:
0/Phytochrome A; 0/Plant Proteins; 0/RNA, Messenger

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