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Cytokinins Are Initial Targets of Light in the Control of Bud Outgrowth(1[OPEN])

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    SYSNO ASEP0468498
    Document TypeJ - Journal Article
    R&D Document TypeJournal Article
    Subsidiary JČlánek ve WOS
    TitleCytokinins Are Initial Targets of Light in the Control of Bud Outgrowth(1[OPEN])
    Author(s) Roman, H. (FR)
    Girault, T. (FR)
    Barbier, F. (FR)
    Peron, T. (FR)
    Brouard, N. (FR)
    Pěnčík, Aleš (UEB-Q) ORCID, RID, SAI
    Novák, Ondřej (UEB-Q) RID, ORCID, SAI
    Vian, A. (FR)
    Sakr, S. (FR)
    Lothier, J. (FR)
    Le Gourrierec, J. (FR)
    Leduc, N. (BE)
    Number of authors12
    Source TitlePlant Physiology - ISSN 0032-0889
    Roč. 172, č. 1 (2016), s. 489-509
    Number of pages21 s.
    Languageeng - English
    CountryUS - United States
    Keywordscell-cycle regulation ; pea axillary buds ; oryza-sativa l. ; apical dominance ; rosa sp ; arabidopsis-thaliana ; lateral buds ; meristem activity ; plant-responses ; acts downstream
    Subject RIVEB - Genetics ; Molecular Biology
    R&D ProjectsLO1204 GA MŠk - Ministry of Education, Youth and Sports (MEYS)
    LK21306 GA MŠk - Ministry of Education, Youth and Sports (MEYS)
    Institutional supportUEB-Q - RVO:61389030
    UT WOS000388451900037
    AnnotationBud outgrowth is controlled by environmental and endogenous factors. Through the use of the photosynthesis inhibitor norflurazon and of masking experiments, evidence is given here that light acts mainly as a morphogenic signal in the triggering of bud outgrowth and that initial steps in the light signaling pathway involve cytokinins (CKs). Indeed, in rose (Rosa hybrida), inhibition of bud outgrowth by darkness is suppressed solely by the application of CKs. In contrast, application of sugars has a limited effect. Exposure of plants to white light (WL) induces a rapid (after 3-6 h of WL exposure) up-regulation of CK synthesis (RhIPT3 and RhIPT5), of CK activation (RhLOG8), and of CK putative transporter RhPUP5 genes and to the repression of the CK degradation RhCKX1 gene in the node. This leads to the accumulation of CKs in the node within 6 h and in the bud at 24 h and to the triggering of bud outgrowth. Molecular analysis of genes involved in major mechanisms of bud outgrowth (strigolactone signaling [RwMAX2], metabolism and transport of auxin [RhPIN1, RhYUC1, and RhTAR1], regulation of sugar sink strength [RhVI, RhSUSY, RhSUC2, and RhSWEET10], and cell division and expansion [RhEXP and RhPCNA]) reveal that, when supplied in darkness, CKs up-regulate their expression as rapidly and as intensely as WL. Additionally, up-regulation of CKs by WL promotes xylem flux toward the bud, as evidenced by Methylene Blue accumulation in the bud after CK treatment in the dark. Altogether, these results suggest that CKs are initial components of the light signaling pathway that controls the initiation of bud outgrowth.
    WorkplaceInstitute of Experimental Botany
    ContactDavid Klier,, Tel.: 220 390 469
    Year of Publishing2017
Number of the records: 1