Document Detail


Stem cell activation by light guides plant organogenesis.
MedLine Citation:
PMID:  21724835     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Leaves originate from stem cells located at the shoot apical meristem. The meristem is shielded from the environment by older leaves, and leaf initiation is considered to be an autonomous process that does not depend on environmental cues. Here we show that light acts as a morphogenic signal that controls leaf initiation and stabilizes leaf positioning. Leaf initiation in tomato shoot apices ceases in the dark but resumes in the light, an effect that is mediated through the plant hormone cytokinin. Dark treatment also affects the subcellular localization of the auxin transporter PIN1 and the concomitant formation of auxin maxima. We propose that cytokinin is required for meristem propagation, and that auxin redirects cytokinin-inducible meristem growth toward organ formation. In contrast to common wisdom over the last 150 years, the light environment controls the initiation of lateral organs by regulating two key hormones: auxin and cytokinin.
Authors:
Saiko Yoshida; Therese Mandel; Cris Kuhlemeier
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Genes & development     Volume:  25     ISSN:  1549-5477     ISO Abbreviation:  Genes Dev.     Publication Date:  2011 Jul 
Date Detail:
Created Date:  2011-07-04     Completed Date:  2011-08-26     Revised Date:  2013-06-28    
Medline Journal Info:
Nlm Unique ID:  8711660     Medline TA:  Genes Dev     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1439-50     Citation Subset:  IM    
Affiliation:
Institute of Plant Sciences, University of Bern, CH-3013 Bern, Switzerland.
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MeSH Terms
Descriptor/Qualifier:
Cytokinins / metabolism,  pharmacology
Gene Expression Regulation, Plant / radiation effects
Indoleacetic Acids / metabolism,  pharmacology
Light*
Lycopersicon esculentum / cytology*,  drug effects,  growth & development,  radiation effects*
Membrane Transport Proteins / metabolism
Organogenesis / drug effects,  radiation effects*
Plant Growth Regulators / pharmacology
Plant Leaves / cytology,  drug effects,  growth & development,  radiation effects
Plant Shoots / cytology,  drug effects,  growth & development,  radiation effects
Plant Stems / cytology*,  drug effects,  radiation effects*
Protein Transport / radiation effects
Signal Transduction / radiation effects
Chemical
Reg. No./Substance:
0/Cytokinins; 0/Indoleacetic Acids; 0/Membrane Transport Proteins; 0/Plant Growth Regulators
Comments/Corrections

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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