Eremina, M.* ; Unterholzner, S.J.* ; Rathnayake, A.I.* ; Castellanos, M.* ; Khan, M.I.* ; Kugler, K.G. ; May, S.T.* ; Mayer, K.F.X. ; Rozhon, W.* ; Poppenberger, B.*
     
    
        
         Brassinosteroids participate in the control of basal and acquired freezing tolerance of plants.
        Brassinosteroids participate in the control of basal and acquired freezing tolerance of plants.
     
    
        
    
    
        
        Proc. Natl. Acad. Sci. U.S.A. 113, E5982-E5991 (2016)
    
    
    
      
      
	
	    Brassinosteroids (BRs) are growth-promoting plant hormones that play a role in abiotic stress responses, but molecular modes that enable this activity remain largely unknown. Here we show that BRs participate in the regulation of freezing tolerance. BR signaling-defective mutants of Arabidopsis thaliana were hypersensitive to freezing before and after cold acclimation. The constitutive activation of BR signaling, in contrast, enhanced freezing resistance. Evidence is provided that the BR-controlled basic helix-loop-helix transcription factor CESTA (CES) can contribute to the constitutive expression of the C-REPEAT/DEHYDRATION-RESPONSIVE ELEMENT BINDING FACTOR (CBF) transcriptional regulators that control cold responsive (COR) gene expression. In addition, CBF-independent classes of BR-regulated COR genes are identified that are regulated in a BR- and CES-dependent manner during cold acclimation. A model is presented in which BRs govern different cold-responsive transcriptional cascades through the posttranslational modification of CES and redundantly acting factors. This contributes to the basal resistance against freezing stress, but also to the further improvement of this resistance through cold acclimation.
	
	
	    
	
       
      
	
	    
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        Publication type
        Article: Journal article
    
 
    
        Document type
        Scientific Article
    
 
    
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        Keywords
        Cbf1 ; Cbfs ; Cesta ; Brassinosteroid ; Cold Responses; Cold Response Pathway; Gene-expression; Low-temperature; Arabidopsis-thaliana; Transcriptional Activators; Signaling Pathway; Biosynthesis; Stress; Ice1; Growth
    
 
    
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        Publication Year
        2016
    
 
    
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        2016
    
 
    
    
        ISSN (print) / ISBN
        0027-8424
    
 
    
        e-ISSN
        1091-6490
    
 
    
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	    Volume: 113,  
	    Issue: 40,  
	    Pages: E5982-E5991 
	    Article Number: ,  
	    Supplement: ,  
	
    
 
    
        
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            National Academy of Sciences
        
 
        
            Publishing Place
            Washington
        
 
	
        
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        Reviewing status
        Peer reviewed
    
 
     
    
        POF-Topic(s)
        30202 - Environmental Health
    
 
    
        Research field(s)
        Environmental Sciences
    
 
    
        PSP Element(s)
        G-503500-002
    
 
    
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        Erfassungsdatum
        2016-10-07