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Transcriptional response of A. thaliana Root and Shoot tissue to light stress and presence of microbial communities in myc2-3 and MYC2-Flag lines

ABSTRACT: Transcriptional response of A. thaliana Root and Shoot tissue to light stress and presence of microbial communities in myc2-3 and MYC2-Flag lines

PROVIDER: PRJNA671872 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR12899026.fastq.gz	Fastqsanger.gz
	SRR12899027.fastq.gz	Fastqsanger.gz
	SRR12899028.fastq.gz	Fastqsanger.gz
	SRR12899029.fastq.gz	Fastqsanger.gz
	SRR12899030.fastq.gz	Fastqsanger.gz

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Transcriptional response of A. thaliana Root and Shoot tissue to light stress and presence of microbial communities in myc2-3 and MYC2-Flag lines

Project description:MYC2 is a central node controlling the crosstalk between JA and other phytohormone signalling pathways and regulating responses to light and circadian clock. We hypothesized that this transcription factor might coordinate prioritization of microbiota-induced growth over defense under suboptimal light conditions

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Transcriptional response of A. thaliana Root and Shoot tissue to light stress and presence of microbial communities

Project description:We profiled the root and shoot transcriptomes of BFO-colonized (Bacteria, Fungi, Oomycetes) and germ free A. thaliana exposed to Low PAR (photoactive radiation, LP) and normal condition (NC) in the gnotobiotic FlowPot system five weeks post inoculation.

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Transcriptional response of A. thaliana Root and Shoot tissue to light stress and presence of microbial communities

Project description:Transcriptional response of A. thaliana Root and Shoot tissue to light stress and presence of microbial communities

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ChIP-Seq of Arabidopsis Transcription Factors MYC2 and MYC3

Project description:The genome-wide target genes of transcription factors MYC2 and MYC3 were determined in etiolated (dark-grown) seedlings of Arabidopsis thaliana. Chromatin immunoprecipition of MYC2 and MYC3 was performed as described in O’Malley et al (2016; doi: 10.1016/j.cell.2016.04.038), using transgenic A. thaliana expressing MYC2::YpET and MYC3::YpET fusion proteins from their native promoters, generated by recombineering (Gimenez-Ibanez et al. 2017; doi: 10.1111/nph.14354 ). Three-day old etiolated seedlings were treated with methyl JA for 2 h (as described in Schweizer et al., 2013), then harvested for ChIP-Seq.

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A MYC2, MYC3, MYC4-dependent transcription factor network regulates touch responses in plants

Project description:Plants are continuously exposed to environmental triggers, including mechanical stimulation. Our results demonstrate that jasmonic acid (JA)-signalling not only plays a key role in touch-induced developmental changes, but also in the very early gene expression changes. Using multi-omics, we show that the JA-activated transcription factors MYC2/MYC3/MYC4 co-regulate touch-induced gene expression of 266 genes. MYC2/3/4 particularly activate top touch-induced genes, which peak around 25 minutes and then rapidly decline by 40-60 minutes. ChIP-seq shows that MYC2 dynamically binds hundreds of touch-induced promoters within 25 minutes. Furthermore, promoter activation assays confirm that MYC2 directly activates touch-induced promoters. By combining these data, we identified a core MYC2/3/4-dependent ‘touch regulon’, containing many previously-unknown MYC2 targets like bHLH19 and ERF109. bHLH19 can in turn directly activate the ORA47 promoter, indicating that MYC2/3/4 initiate a hierarchical network of downstream transcription factors. Finally, hormone profiling shows that the rapid touch-induced accumulation of JA/JA-isoleucine is directly controlled by MYC2/3/4 in a positive amplification loop regulating JA-biosynthesis genes.

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A MYC2, MYC3, MYC4-dependent transcription factor network regulates touch responses in plants

Project description:Plants are continuously exposed to environmental triggers, including mechanical stimulation. Our results demonstrate that jasmonic acid (JA)-signalling plays a key role in very early gene expression changes, well before it leads to touch-induced developmental changes. We show that the JA-activated transcription factors MYC2/MYC3/MYC4 co-regulate touch-induced gene expression of 266 genes, many of which peak in induction around 25 minutes and then rapidly decline by 40-60 minutes. ChIP-seq shows that MYC2 dynamically binds hundreds of touch-induced promoters within 25 minutes. Promoter activation assays confirm that MYC2 directly activates these touch-induced promoters. By combining multi-omic data, we have identified a core MYC2/3/4-dependent ‘touch regulon’, containing many previously-unknown MYC2 targets like bHLH19 and ERF109. We show bHLH19 can in turn directly activate the ORA47 promoter, indicating that MYC2/3/4 initiate a hierarchical network of downstream transcription factors. Through hormone profiling we reveal the rapid touch-induced accumulation of JA/JA-isoleucine is directly controlled by MYC2/3/4 in a positive amplification loop regulating JA-biosynthesis genes.

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MYC2 phosphorylation

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ELONGATED HYPOCOTYL5-mediated light signaling promotes shoot regeneration in Arabidopsis thaliana

Project description:Injured plant somatic tissues regenerate themselves by establishing the shoot or root meristems. In Arabidopsis (Arabidopsis thaliana) a two-step culture system ensures regeneration by first promoting the acquisition of pluripotency and subsequently specifying the fate of new meristems. Although previous studies have reported the importance of phytohormones auxin and cytokinin in determining the fate of new meristems, it remains elusive whether and how the environmental factors influence this process. In this study, we investigated the impact of light signals on shoot regeneration using Arabidopsis hypocotyl as explants. We found that light signals promote shoot regeneration while inhibiting root formation. ELONGATED HYPOCOTYL 5 (HY5), the pivotal transcriptional factor in light signaling, plays a central role in this process by mediating the expression of key genes controlling the fate of new meristems. Specifically, HY5 directly represses root development genes and activates shoot meristem genes, leading to the establishment of shoot progenitor from pluripotent callus. We further demonstrated that the early activation of photosynthesis is critical for shoot initiation, and this is transcriptionally regulated downstream of the HY5-dependent pathways. In conclusion, we uncovered the intricate molecular mechanisms by which light signals control the establishment of new meristem through the regulatory network governed by HY5, thus, highlighting the influence of light signals on plant developmental plasticity.

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JA-INDUCIBLE MYC2-LIKE1 acts as a repressor and negatively regulates jasmonate signaling in Arabidopsis

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