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Impact of end-of-day red and far-red light on plant morphology and hormone physiology of poinsettia

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    SYSNO ASEP0432724
    Document TypeJ - Journal Article
    R&D Document TypeJournal Article
    Subsidiary JČlánek ve WOS
    TitleImpact of end-of-day red and far-red light on plant morphology and hormone physiology of poinsettia
    Author(s) Islam, M.A. (NO)
    Tarkowská, Danuše (UEB-Q) RID, ORCID
    Clarke, J.L. (NO)
    Blystad, D.R. (NO)
    Gislerod, H.R. (NO)
    Torre, S. (NO)
    Olsen, J.E. (NO)
    Source TitleScientia horticulturae. - : Elsevier - ISSN 0304-4238
    Roč. 174, JUL 2014 (2014), s. 77-86
    Number of pages10 s.
    Languageeng - English
    CountryNL - Netherlands
    KeywordsAbscisic acid ; End of day far red light ; End of day red light
    Subject RIVEF - Botanics
    R&D ProjectsLK21306 GA MŠk - Ministry of Education, Youth and Sports (MEYS)
    LO1204 GA MŠk - Ministry of Education, Youth and Sports (MEYS)
    Institutional supportUEB-Q - RVO:61389030
    UT WOS000340312300011
    AnnotationControl of morphology is essential in greenhouse production of poinsettia, which is among the largest and economically most important ornamental pot plant cultures worldwide. Plant growth regulators are used to reduce shoot elongation but due to their potentially negative impacts on human health and the environment, it is highly desirable to replace these. Exploiting responses to light quality as an alternative has been investigated to a limited extent only in poinsettia and information about elongation-controlling hormones is scarce. In natural light an increased far-red (FR) proportion at the end of the day (EOD) is known to enhance shoot elongation in several species through action of phytochrome on hormone metabolism. The aim of this study was to assess the effect of manipulation of the phytochrome system at the EOD on elongation growth and hormone metabolism in poinsettia. Depending on cultivar, shoot elongation and internode lengths were reduced 34-54% by exposure to 30 min EOD-R compared to 30 min EOD-FR, both provided by light emitting diodes. The reduced elongation under EOD-R correlated with 29% and 21% lower levels of gibberellin and indole-3-acetic acid, respectively. Specific leaf and bract area were also significantly lower under EOD-R compared to EOD-FR. Bract formation and time to visible cyathia did not differ between the light treatments. In conclusion, manipulation of the phytochrome system by EOD-R in order to modulate the contents of the growth-controlling hormones can be a useful tool in control of shoot elongation in greenhouse-grown poinsettia in order to counteract the effect of the increased FR proportion at the EOD. (C) 2014 Elsevier B.V. All rights reserved.
    WorkplaceInstitute of Experimental Botany
    ContactDavid Klier,, Tel.: 220 390 469
    Year of Publishing2015
Number of the records: 1