Journal
PLANT PHYSIOLOGY AND BIOCHEMISTRY
Volume 104, Issue -, Pages 146-154Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.plaphy.2016.03.018
Keywords
Light-emitting diode (LED); Blue light 450 nm; Photoreceptors; microRNA; Transcription factors ARF
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Funding
- Russian Foundation for Basic Research [12-04-31691, 13-04-01001]
- Federal Target Program Scientific and scientific-pedagogical personnel of innovative Russia [8586]
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The effect of blue LED (450 nm) on the photomorphogenesis of Arabidopsis thaliana Col-0 plants and the transcript levels of several genes, including miRNAs, photoreceptors and auxin response factors (ARF) was investigated. It was observed that blue light accelerated the generative development, reduced the rosette leaf number, significantly reduced the leaf area, dry biomass and led to the disruption of conductive tissue formation. The blue LED differentially influenced the transcript levels of several phytochromes (PHY a, b, c, d, and e), cryptochromes (CRY I and 2) and phototropins (PHOT 1 and 2). At the same time, the blue LED significantly increased miR167 expression compared to a fluorescent lamp or white LEDs. This increase likely resulted in the enhanced transcription of the auxin response factor genes ARF4 and ARF8, which are regulated by this miRNA. These findings support the hypothesis that the effects of blue light on A. thaliana are mediated by auxin signalling pathway involving miRNA-dependent regulation of ARF gene expression. (C) 2016 Elsevier Masson SAS. All rights reserved.
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