Dawn and photoperiod sensing by phytochrome A

Seaton, Daniel D; Toledo‐Ortiz, Gabriela; Ganpudi, Ashwin; Kubota, Atsuhito; Imaizumi, Takato; Halliday, Karen

doi:10.1073/pnas.1803398115

Cited by 39 publications

(22 citation statements)

References 48 publications

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“…Photoreceptors play a pivotal role in this flowering event. Notably, phyA is the master regulator for morning activated genes, especially under the SD condition, whose expression is directly controlled through interaction with PIF4 and PIF5 [85]. Photoactivated phyA and phyB compete with COP1 for binding to SPAs, which leads to inactivation of COP1-SPA complexes [86].…”

Section: Floweringmentioning

confidence: 99%

Regulation of Photomorphogenic Development by Plant Phytochromes

Tripathi

Hoang

Han

et al. 2019

IJMS

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Photomorphogenesis and skotomorphogenesis are two key events that control plant development, from seed germination to flowering and senescence. A group of wavelength-specific photoreceptors, E3 ubiquitin ligases, and various transcription factors work together to regulate these two critical processes. Phytochromes are the main photoreceptors in plants for perceiving red/far-red light and transducing the light signals to downstream factors that regulate the gene expression network for photomorphogenic development. In this review, we highlight key developmental stages in the life cycle of plants and how phytochromes and other components in the phytochrome signaling pathway play roles in plant growth and development.

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Section: Floweringmentioning

confidence: 99%

Regulation of Photomorphogenic Development by Plant Phytochromes

Tripathi

Hoang

Han

et al. 2019

IJMS

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“…Increasing temperature promotes similar architectural changes as shade 13 and a subset of these temperature responses depend on phytochromes 4,5,14 . Moreover, phytochromes are important to entrain the circadian clock and for the perception of the photoperiod 6,15,16 . These signals in addition to temperature and light quality control flowering time 6,17–19 .…”

Section: Introductionmentioning

confidence: 99%

Molecular mechanisms underlying phytochrome-controlled morphogenesis in plants

2019

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Phytochromes are bilin-binding photosensory receptors which control development over a broad range of environmental conditions and throughout the whole plant life cycle. Light-induced conformational changes enable phytochromes to interact with signaling partners, in particular transcription factors or proteins that regulate them, resulting in large-scale transcriptional reprograming. Phytochromes also regulate promoter usage, mRNA splicing and translation through less defined routes. In this review we summarize our current understanding of plant phytochrome signaling, emphasizing recent work performed in Arabidopsis. We compare and contrast phytochrome responses and signaling mechanisms among land plants and highlight open questions in phytochrome research.

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“…Nonetheless, some plants are able to activate the biosynthesis of anthocyanins in short photoperiod situations. Anthocyanin promotion has been observed in A. thaliana due to short photoperiod sensing by phytochrome A [67]. In Begonia semperflorens , short-day period, together with low temperatures, is crucial for anthocyanin biosynthesis and it is directly related to increased activities of the enzymes PAL , CHI , DFR and UFGT [95].…”

Section: Discussionmentioning

confidence: 99%

Hybrid de novo transcriptome assembly of poinsettia (Euphorbia pulcherrima Willd. Ex Klotsch) bracts

et al. 2019

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BackgroundPoinsettia is a popular and important ornamental crop, mostly during the Christmas season. Its bract coloration ranges from pink/red to creamy/white shades. Despite its ornamental value, there is a lack of knowledge about the genetics and molecular biology of poinsettia, especially on the mechanisms of color formation. We performed an RNA-Seq analysis in order to shed light on the transcriptome of poinsettia bracts. Moreover, we analyzed the transcriptome differences of red- and white-bracted poinsettia varieties during bract development and coloration. For the assembly of a bract transcriptome, two paired-end cDNA libraries from a red and white poinsettia pair were sequenced with the Illumina technology, and one library from a red-bracted variety was used for PacBio sequencing. Both short and long reads were assembled using a hybrid de novo strategy. Samples of red- and white-bracted poinsettias were sequenced and comparatively analyzed in three color developmental stages in order to understand the mechanisms of color formation and accumulation in the species.ResultsThe final transcriptome contains 288,524 contigs, with 33% showing confident protein annotation against the TAIR10 database. The BUSCO pipeline, which is based on near-universal orthologous gene groups, was applied to assess the transcriptome completeness. From a total of 1440 BUSCO groups searched, 77% were categorized as complete (41% as single-copy and 36% as duplicated), 10% as fragmented and 13% as missing BUSCOs. The gene expression comparison between red and white varieties of poinsettia showed a differential regulation of the flavonoid biosynthesis pathway only at particular stages of bract development. An initial impairment of the flavonoid pathway early in the color accumulation process for the white poinsettia variety was observed, but these differences were no longer present in the subsequent stages of bract development. Nonetheless, GSTF11 and UGT79B10 showed a lower expression in the last stage of bract development for the white variety and, therefore, are potential candidates for further studies on poinsettia coloration.ConclusionsIn summary, this transcriptome analysis provides a valuable foundation for further studies on poinsettia, such as plant breeding and genetics, and highlights crucial information on the molecular mechanism of color formation.

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Dawn and photoperiod sensing by phytochrome A

Cited by 39 publications

References 48 publications

Regulation of Photomorphogenic Development by Plant Phytochromes

Regulation of Photomorphogenic Development by Plant Phytochromes

Molecular mechanisms underlying phytochrome-controlled morphogenesis in plants

Hybrid de novo transcriptome assembly of poinsettia (Euphorbia pulcherrima Willd. Ex Klotsch) bracts

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