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Calmodulin7 plays an important role as transcriptional regulator in Arabidopsis seedling development

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Title Calmodulin7 plays an important role as transcriptional regulator in Arabidopsis seedling development
 
Creator Kushwaha, Ritu
Singh, Aparna
Chattopadhyay, Sudip
 
Subject Transcriptional Regulator
Arabidopsis
Calmodulin 7
Seedling Development
 
Description Although calmodulin (CaM) is known to play multiple regulatory roles in eukaryotes, its direct function as transcriptional
regulator is unknown. Furthermore, the physiological functions of CaM are largely unknown in plants. Here, we show that
one of the four Arabidopsis thaliana CaM isoforms, CAM7, is a transcriptional regulator that directly interacts with the
promoters of light-inducible genes and promotes photomorphogenesis. CAM7 overexpression causes hyperphotomorphogenic growth and an increase in the expression of light-inducible genes. Mutations in CAM7 produce no visible effects on
photomorphogenic growth, indicating likely redundant gene functions. However, cam7 mutants display reduced expression
of light-inducible genes, and cam7 hy5 double mutants show an enhancement of the hy5 phenotype. Moreover, over-
expression of CAM7 can partly suppress the hy5 phenotype, indicating that the two factors work together to control light-
induced seedling development. The mutational and transgenic studies, together with physiological analyses, illustrate the
concerted function of CAM7 and HY5 basic leucine zipper transcription factor in Arabidopsis seedling development.
 
Date 2013-11-07T11:02:15Z
2013-11-07T11:02:15Z
2008
27 June 2008
 
Type Article
 
Identifier Plant Cell, 20: 1747-1759
http://hdl.handle.net/123456789/92
 
Language en
 
Publisher American Society of Plant Biologists