Document Detail

The regulation of cell wall extensibility during shade avoidance: a study using two contrasting ecotypes of Stellaria longipes.
MedLine Citation:
PMID:  18768908     Owner:  NLM     Status:  MEDLINE    
Shade avoidance in plants involves rapid shoot elongation to grow toward the light. Cell wall-modifying mechanisms are vital regulatory points for control of these elongation responses. Two protein families involved in cell wall modification are expansins and xyloglucan endotransglucosylase/hydrolases. We used an alpine and a prairie ecotype of Stellaria longipes differing in their response to shade to study the regulation of cell wall extensibility in response to low red to far-red ratio (R/FR), an early neighbor detection signal, and dense canopy shade (green shade: low R/FR, blue, and total light intensity). Alpine plants were nonresponsive to low R/FR, while prairie plants elongated rapidly. These responses reflect adaptation to the dense vegetation of the prairie habitat, unlike the alpine plants, which almost never encounter shade. Under green shade, both ecotypes rapidly elongate, showing that alpine plants can react only to a deep shade treatment. Xyloglucan endotransglucosylase/hydrolase activity was strongly regulated by green shade and low blue light conditions but not by low R/FR. Expansin activity, expressed as acid-induced extension, correlated with growth responses to all light changes. Expansin genes cloned from the internodes of the two ecotypes showed differential regulation in response to the light manipulations. This regulation was ecotype and light signal specific and correlated with the growth responses. Our results imply that elongation responses to shade require the regulation of cell wall extensibility via the control of expansin gene expression. Ecotypic differences demonstrate how responses to environmental stimuli are differently regulated to survive a particular habitat.
Rashmi Sasidharan; C C Chinnappa; Laurentius A C J Voesenek; Ronald Pierik
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-09-03
Journal Detail:
Title:  Plant physiology     Volume:  148     ISSN:  0032-0889     ISO Abbreviation:  Plant Physiol.     Publication Date:  2008 Nov 
Date Detail:
Created Date:  2008-11-07     Completed Date:  2009-01-02     Revised Date:  2013-06-05    
Medline Journal Info:
Nlm Unique ID:  0401224     Medline TA:  Plant Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1557-69     Citation Subset:  IM    
Plant Ecophysiology, Institute of Environmental Biology, Utrecht University, 3584 CA Utrecht, The Netherlands.
Data Bank Information
Bank Name/Acc. No.:
GENBANK/EU840703;  EU840714;  EU840720;  EU840721
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MeSH Terms
Cell Wall*
Molecular Sequence Data
Plant Proteins / physiology
Species Specificity
Stellaria / physiology*
Reg. No./Substance:
0/Plant Proteins
Comment In:
Plant Signal Behav. 2009 Jun;4(6):528-9   [PMID:  19816143 ]

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

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