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    Supra-optimal expression of the cold-regulated OsMyb4 transcription factor in transgenic rice changes the complexity of transcriptional network with major effects on stress tolerance and panicle development

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    Type
    Article
    Authors
    Park, Myoungryoul
    Yun, Kilyoung
    Mohanty, Bijayalaxmi
    Herath, Venura
    Xu, Fuyu
    Wijaya, Edward
    Bajic, Vladimir B. cc
    Yun, Songjoong
    De Los Reyes, Benildo G.
    KAUST Department
    Computational Bioscience Research Center (CBRC)
    Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
    Applied Mathematics and Computational Science Program
    Date
    2010-09-28
    Online Publication Date
    2010-09-28
    Print Publication Date
    2010-12
    Permanent link to this record
    http://hdl.handle.net/10754/561565
    
    Metadata
    Show full item record
    Abstract
    The R2R3-type OsMyb4 transcription factor of rice has been shown to play a role in the regulation of osmotic adjustment in heterologous overexpression studies. However, the exact composition and organization of its underlying transcriptional network has not been established to be a robust tool for stress tolerance enhancement by regulon engineering. OsMyb4 network was dissected based on commonalities between the global chilling stress transcriptome and the transcriptome configured by OsMyb4 overexpression. OsMyb4 controls a hierarchical network comprised of several regulatory sub-clusters associated with cellular defense and rescue, metabolism and development. It regulates target genes either directly or indirectly through intermediary MYB, ERF, bZIP, NAC, ARF and CCAAT-HAP transcription factors. Regulatory sub-clusters have different combinations of MYB-like, GCC-box-like, ERD1-box-like, ABRE-like, G-box-like, as1/ocs/TGA-like, AuxRE-like, gibberellic acid response element (GARE)-like and JAre-like cis-elements. Cold-dependent network activity enhanced cellular antioxidant capacity through radical scavenging mechanisms and increased activities of phenylpropanoid and isoprenoid metabolic processes involving various abscisic acid (ABA), jasmonic acid (JA), salicylic acid (SA), ethylene and reactive oxygen species (ROS) responsive genes. OsMyb4 network is independent of drought response element binding protein/C-repeat binding factor (DREB/CBF) and its sub-regulons operate with possible co-regulators including nuclear factor-Y. Because of its upstream position in the network hierarchy, OsMyb4 functions quantitatively and pleiotrophically. Supra-optimal expression causes misexpression of alternative targets with costly trade-offs to panicle development. © 2010 Blackwell Publishing Ltd.
    Sponsors
    This study was funded by the United States Department of Agriculture (USDA) National Research Initiative (2006-35604-1669) and Maine Agricultural and Forestry Experiment Station (Publication 3104). M.-R.P. was a recipient of the Korea Research Foundation Fellowship (KRF-2006-352-F00002). S.-J.Y. and M.-R.P. were supported by BioGreen 21 Program-RDA (20080401034024), Republic of Korea. We also thank Dr Yulin Jia and the two anonymous reviewers for their insightful suggestions.
    Publisher
    Wiley
    Journal
    Plant, Cell & Environment
    DOI
    10.1111/j.1365-3040.2010.02221.x
    PubMed ID
    20807373
    ae974a485f413a2113503eed53cd6c53
    10.1111/j.1365-3040.2010.02221.x
    Scopus Count
    Collections
    Articles; Applied Mathematics and Computational Science Program; Computational Bioscience Research Center (CBRC); Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division

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