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Arabidopsis thaliana

ABSTRACT: Integration of Developmental and Environmental Signals via a Polyadenylation Factor in Arabidopsis

PROVIDER: PRJNA269041 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR1687621.fastq.gz	Fastqsanger.gz
	SRR1687633.fastq.gz	Fastqsanger.gz
	SRR1687645.fastq.gz	Fastqsanger.gz
	SRR1687608.fastq.gz	Fastqsanger.gz

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Arabidopsis thaliana

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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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Project description:Purpose: Circadian clock in plants temporally coordinates biological processes throughout the day synchronizing gene expression with environmental changes. Here, we examined the genome-wide circadian and diurnal control of Arabidopsis transcriptome using high throughout RNA-seq approach. Methods: Transcriptional and posttranscritional profiles were identified and characterized for Arabidopsis seedlings grown under continuous light or long-day condition (16 h light/8 h dark) for one day (each condition has two biological replicates). Results: We show that rhythmic posttranscriptional regulation is also a significant factor for genome-wide profile of circadian plant transcriptome. Two major posttranscriptioal mechanisms alternative splicing (AS) and alternative polyadenylation (APA) show circadian rhythmicity, resulting from the oscillation in the genes invovled in AS and APA. Conclusions: Arabidopsis circadian clock not only controls the transcription of genes, but also affects their posttranscriptional regulation through regulating AS and APA.

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A polyadenylation factor subunit implicated in regulating oxidative stress responses in Arabidopsis thaliana

Project description:The oxt6 mutant is an oxidative stress-tolerant Arabidopsis mutant that is deficient in a polyadenylation factor subunit. Expression analysis suggests that impaired poly(A) site choice is responsible for the stress-tolerant phenotype. We used microarrays to understand the link between the polyadenylation defect and stress tolerance. Keywords: mutant, wild-type, complemented line comparison

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Project description:Arabidopsis thaliana Ler developmental series

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Profiling of alternative polyadenylation events in Arabidopsis thaliana

Project description:Use 3ʹ region extraction and deep sequencing (3'READS) and bioinformatics techniques to profile alternative polyadenylation and gene regulation in plant Arabidopsis thaliana exposed to light and darkness

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Arabidopsis thaliana

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