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    Phosphate-dependent root system architecture responses to salt stress

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    Plant Physiol.-2016-Kawa-pp.16.00712.pdf
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    Type
    Article
    Authors
    Kawa, Dorota
    Julkowska, Magdalena
    Montero Sommerfeld, Hector
    Horst, Anneliek ter
    Haring, Michel A
    Testerink, Christa
    KAUST Department
    Biological and Environmental Science and Engineering (BESE) Division
    Center for Desert Agriculture
    Date
    2016-05-20
    Permanent link to this record
    http://hdl.handle.net/10754/618039
    
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    Abstract
    Nutrient availability and salinity of the soil affect growth and development of plant roots. Here, we describe how phosphate availability affects root system architecture (RSA) of Arabidopsis and how phosphate levels modulate responses of the root to salt stress. Phosphate (Pi) starvation reduced main root length and increased the number of lateral roots of Arabidopsis Col-0 seedlings. In combination with salt, low Pi dampened the inhibiting effect of mild salt stress (75mM) on all measured RSA components. At higher NaCl concentrations, the Pi deprivation response prevailed over the salt stress only for lateral root elongation. The Pi deprivation response of lateral roots appeared to be oppositely affected by abscisic acid (ABA) signaling compared to the salt stress response. Natural variation in the response to the combination treatment of salt and Pi starvation within 330 Arabidopsis accessions could be grouped into four response patterns. When exposed to double stress, in general lateral roots prioritized responses to salt, while the effect on main root traits was additive. Interestingly, these patterns were not identical for all accessions studied and multiple strategies to integrate the signals from Pi deprivation and salinity were identified. By Genome Wide Association Mapping (GWAS) 13 genomic loci were identified as putative factors integrating responses to salt stress and Pi starvation. From our experiments, we conclude that Pi starvation interferes with salt responses mainly at the level of lateral roots and that large natural variation exists in the available genetic repertoire of accessions to handle the combination of stresses.
    Citation
    Phosphate-dependent root system architecture responses to salt stress 2016:pp.00712.2016 Plant Physiology
    Sponsors
    This work was supported by the Netherlands Organisation for Scientific Research (NWO-NSFC project ALW 846.11.002) and STW Perspectief 10987.
    Publisher
    American Society of Plant Biologists (ASPB)
    Journal
    Plant Physiology
    DOI
    10.1104/pp.16.00712
    Additional Links
    http://www.plantphysiol.org/lookup/doi/10.1104/pp.16.00712
    ae974a485f413a2113503eed53cd6c53
    10.1104/pp.16.00712
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Center for Desert Agriculture

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