Document Detail

Effect of blue light on endogenous isopentenyladenine and endoreduplication during photomorphogenesis and de-etiolation of tomato (Solanum lycopersicum L.) seedlings.
MedLine Citation:
PMID:  23049779     Owner:  NLM     Status:  MEDLINE    
Light is one of the most important factor influencing plant growth and development all through their life cycle. One of the well-known light-regulated processes is de-etiolation, i.e. the switch from skotomorphogenesis to photomorphogenesis. The hormones cytokinins (CKs) play an important role during the establishment of photomorphogenesis as exogenous CKs induced photomorphogenesis of dark-grown seedlings. Most of the studies are conducted on the plant model Arabidopsis, but no or few information are available for important crop species, such as tomato (Solanum lycopersicum L.). In our study, we analyzed for the first time the endogenous CKs content in tomato hypocotyls during skotomorphogenesis, photomorphogenesis and de-etiolation. For this purpose, two tomato genotypes were used: cv. Rutgers (wild-type; WT) and its corresponding mutant (7B-1) affected in its responses to blue light (BL). Using physiological and molecular approaches, we identified that the skotomorphogenesis is characterized by an endoreduplication-mediated cell expansion, which is inhibited upon BL exposure as seen by the accumulation of trancripts encoding CycD3, key regulators of the cell cycle. Our study showed for the first time that iP (isopentenyladenine) is the CK accumulated in the tomato hypocotyl upon BL exposure, suggesting its specific role in photomorphogenesis. This result was supported by physiological experiments and gene expression data. We propose a common model to explain the role and the relationship between CKs, namely iP, and endoreduplication during de-etiolation and photomorphogenesis.
Véronique Bergougnoux; David Zalabák; Michaela Jandová; Ondřej Novák; Anika Wiese-Klinkenberg; Martin Fellner
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-09-25
Journal Detail:
Title:  PloS one     Volume:  7     ISSN:  1932-6203     ISO Abbreviation:  PLoS ONE     Publication Date:  2012  
Date Detail:
Created Date:  2012-10-10     Completed Date:  2013-04-22     Revised Date:  2013-07-11    
Medline Journal Info:
Nlm Unique ID:  101285081     Medline TA:  PLoS One     Country:  United States    
Other Details:
Languages:  eng     Pagination:  e45255     Citation Subset:  IM    
Laboratory of Growth Regulators, Faculty of Science, Palacky University and Institute of Experimental Botany A.S ČR v.v.i., Olomouc, Czech Republic.
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MeSH Terms
Cell Cycle / drug effects,  genetics
Cyclin D3 / genetics,  metabolism*
Cytokinins / metabolism*
Endoreduplication / physiology,  radiation effects*
Hypocotyl / physiology,  radiation effects*
Isopentenyladenosine / metabolism*
Lycopersicon esculentum / physiology,  radiation effects*
Morphogenesis / physiology,  radiation effects
Plant Proteins / genetics,  metabolism*
Seedling / physiology,  radiation effects*
Reg. No./Substance:
0/Cyclin D3; 0/Cytokinins; 0/Plant Proteins; 2365-40-4/N(6)-(delta(2)-isopentenyl)adenine; 7724-76-7/Isopentenyladenosine

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