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    Plant natriuretic peptides are apoplastic and paracrine stress response molecules

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    Type
    Article
    Authors
    Wang, Yuhua
    Gehring, Christoph A cc
    Irving, Helen R.
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Bioscience Program
    Molecular Signalling Group
    Date
    2011-04-07
    Online Publication Date
    2011-04-07
    Print Publication Date
    2011-05
    Permanent link to this record
    http://hdl.handle.net/10754/561750
    
    Metadata
    Show full item record
    Abstract
    Higher plants contain biologically active proteins that are recognized by antibodies against human atrial natriuretic peptide (ANP). We identified and isolated two Arabidopsis thaliana immunoreactive plant natriuretic peptide (PNP)-encoding genes, AtPNP-A and AtPNP-B, which are distantly related members of the expansin superfamily and have a role in the regulation of homeostasis in abiotic and biotic stresses, and have shown that AtPNP-A modulates the effects of ABA on stomata. Arabidopsis PNP (PNP-A) is mainly expressed in leaf mesophyll cells, and in protoplast assays we demonstrate that it is secreted using AtPNP-A:green fluorescent protein (GFP) reporter constructs and flow cytometry. Transient reporter assays provide evidence that AtPNP-A expression is enhanced by heat, osmotica and salt, and that AtPNP-A itself can enhance its own expression, thereby generating a response signature diagnostic for paracrine action and potentially also autocrine effects. Expression of native AtPNP-A is enhanced by osmotica and transiently by salt. Although AtPNP-A expression is induced by salt and osmotica, ABA does not significantly modulate AtPNP-A levels nor does recombinant AtPNP-A affect reporter expression of the ABA-responsive RD29A gene. Together, these results provide experimental evidence that AtPNP-A is stress responsive, secreted into the apoplastic space and can enhance its own expression. Furthermore, our findings support the idea that AtPNP-A, together with ABA, is an important component in complex plant stress responses and that, much like in animals, peptide signaling molecules can create diverse and modular signals essential for growth, development and defense under rapidly changing environmental conditions. © 2011 The Author.
    Citation
    Wang, Y. H., Gehring, C., & Irving, H. R. (2011). Plant Natriuretic Peptides are Apoplastic and Paracrine Stress Response Molecules. Plant and Cell Physiology, 52(5), 837–850. doi:10.1093/pcp/pcr036
    Sponsors
    This work was supported by the Australian Research Council [Discovery project funding scheme (DP0557561, DP0878194)]; Australian Postgraduate Award [to Y.H.W.].
    Publisher
    Oxford University Press (OUP)
    Journal
    Plant and Cell Physiology
    DOI
    10.1093/pcp/pcr036
    PubMed ID
    21478192
    ae974a485f413a2113503eed53cd6c53
    10.1093/pcp/pcr036
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Bioscience Program

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