| The phytohormone auxin is a component of the regulatory system that controls UV mediated accumulation of flavonoids and UV induced morphogenesis. | |
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MedLine Citation:
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PMID: 22304327 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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In plants, UV-B acclimation is a complex, dynamic process that plays an essential role in preventing UV-B damage to targets such as DNA and the photosynthetic machinery.In this study we tested the hypothesis that the phytohormone auxin is a component of the regulatory system that controls both UV mediated accumulation of flavonoids, and UV induced morphogenesis. We found that the leaf area of Arabidopsis thalianaCol-0plants raised under a low dose of UV-radiation (0.56 kJ m(-2) daily dose) was, on average,decreased by 23% relative to plants raised in the absence of UV-B, and this was accompanied by a decrease (p= 0.063) in free auxin in young leaf tissues. Compared to Col-0, both the auxin influx mutant axr4-1 and the auxin biosynthesis mutant nit1-3 displayed significantly stronger morphogenic responses, i.e. relative decreases in leaf area were greater for these two mutants. UV exposure also induced accumulation of flavonoids. In Col-0, increases in the concentrations of specific kaempferol derivatives rangedfrom 2.1 to 19-fold. Thus, UV induces complexchanges in flavonoid glycosylation patterns. Compared to Col-0, three auxin mutants displayed significantly different flavonoid profiles. Thus, based on mutant analysis, it is concluded that the phytohormone auxin plays a role in UV acclimation by regulating flavonoid concentration, flavonoid-glycosylation pattern and by controllingUV induced morphogenic responses. |
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Authors:
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Kathleen Hectors; Sandra van Oevelen; Yves Guisez; Els Prinsen; Marcel A K Jansen |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-2-3 |
Journal Detail:
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Title: Physiologia plantarum Volume: - ISSN: 1399-3054 ISO Abbreviation: - Publication Date: 2012 Feb |
Date Detail:
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Created Date: 2012-2-6 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 1256322 Medline TA: Physiol Plant Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © Physiologia Plantarum 2012. |
Affiliation:
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Laboratory of Molecular Physiology and Biotechnology, Department of Biology, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium Laboratory of Plant growth and Development, Department of Biology, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium School of Biological, Environmental and Earth Sciences, University College Cork, Distillery Field, North Mall, Cork, Ireland. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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