Metabolomics,Unknown,Transcriptomics,Genomics,Proteomics

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Comparative transcriptomic analysis of Arabidopsis plants treated with short oligogalacturonides and mock

ABSTRACT: The importance of oligogalacturonides for plant defence and growth has been described extensively in litterature. However, much of previous global transcriptome analyses for plants treated with oligogalacturonides have focused on long (>10 galacturonosyl residues) oligogalacturonides. This study focuses on the transcriptomic impact that short (<10 galacturonosyl residues) oligogalacturonides have on plant transcriptomes and overall biology. Arabidopsis seedling were grown on liquid 1/2 MS medium in 12-well culture plates in vitro for 12 days. 12 seedlings were cultured per well, and three wells were combined per biological replicate. The seedling plants were treated either with 1/2 MS medium (mock), 1/2 MS with trimeric oligogalacturonides (trimers) and a mixture of 1/2 MS and oligogalacturonides (short OG-mix) containing 2-9 residues for 3 hours. RNA was extracted from the seedlings, three biological replicates per treatment, and sequenced using the SOLiD 5500XL platform.

ORGANISM(S): Arabidopsis thaliana

SUBMITTER: Martin Broberg

PROVIDER: E-GEOD-69538 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:The emerging picture of transcriptional regulation is one of unexpected complexity. It is now clear that single transcription factors control hundreds, if not thousands, of direct targets by binding their genomic loci, but it is not understood how many of these are major players and how many are supporting cast. To address this, we leverage a well-characterized developmental network in Arabidopsis and map genome-wide binding of related proteins in multiple tissues. The transcription factor APETALA2 (AP2) has numerous functions, including roles in floral organ identity, seed development and stem cell maintenance. We focus on the role of AP2 in the floral transition and map direct targets on a genome-wide scale. We show that ap2 mutants flower early in long and short days, and that AP2 binds to many loci, most prominently floral pathway integrators, microRNAs and floral organ identity genes, many of which exhibit AP2-dependent transcription. Opposing, logical effects are evident in AP2 binding to two developmental microRNA genes that control AP2 expression, with AP2 positively regulating miR156 and negatively regulating miR172, forming a complex direct feedback loop, which also included all but one of the AP2-like miR172 target clade members. We also seek conserved targets by comparing the genome-wide direct target repertoire of AP2 with that of SCHLAFMÜTZE (SMZ), another member of the AP2-like miR172 target clade that shares partial redundancy, as evidenced by a hexuple mutant for the entire clade that flowered extremely early. Clear similarities and divergence are exposed in the AP2 and SMZ direct target repertoires. Finally, using an inducible expression system, we demonstrate that AP2 has dual molecular roles. It functions both as a transcriptional activator and repressor, directly inducing the expression of the floral repressor AGAMOUS-LIKE 15 (AGL15), and directly repressing the transcription of floral activators like SUPPRESSOR OF OVEREXPRESSION OF CONSTANS 1 (SOC1). ChIP-Seq of two biological replicates for ATH-AP2 and respective control samples

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Comparative transcriptomic analysis of Arabidopsis plants treated with short oligogalacturonides and mock

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