Metabolomics,Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Arabidopsis thaliana strain:Landsberg erecta Transcriptome or Gene expression

ABSTRACT: To study cell type-specific gene expression in the leaf boundary region in the genome scale, we employed the TRAP-seq approach recently implemented. In brief, we introduced a reporter line carrying the fusion of the large subunit ribosomal protein L18 with N-terminal His and FLAG epitope tags (HF-RPL18) under the control of the pOp promoter into driver lines expressing the chimeric TF LhG4 under the control of the LATERAL SUPPRESSOR (LAS) promoter, and under the control of the ASYMMETRIC LEAVES1 (AS1) promoter. These driver lines were chosen because pLAS::LhG4 has boundary region-specific activity (Goldshmidt et al, 2008), and pAS1::LhG4 drives pOp reporter expression throughout emerging leaf primordia, but not in the SAM. Cell type-specific expression of HF-RPL18 can efficiently incorporate epitope tags into polysomes for immunopurification of all translating cellular mRNAs. We immunopurified polysomes from seedlings at 7 days after germination (DAG), to isolate translating mRNA in the LAS-expressing organ boundary cells and AS1-expressing leaf primordia and cotyledon cells. Then, we used deep sequencing to map and quantify these mRNA samples.

INSTRUMENT(S): Illumina HiSeq 2000

ORGANISM(S): Arabidopsis thaliana

SUBMITTER: Yuling Jiao

PROVIDER: E-MTAB-4423 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

An organ boundary-enriched gene regulatory network uncovers regulatory hierarchies underlying axillary meristem initiation.

Tian Caihuan C Zhang Xiaoni X He Jun J Yu Haopeng H Wang Ying Y Shi Bihai B Han Yingying Y Wang Guoxun G Feng Xiaoming X Zhang Cui C Wang Jin J Qi Jiyan J Yu Rong R Jiao Yuling Y

Molecular systems biology 20141030

Gene regulatory networks (GRNs) control development via cell type-specific gene expression and interactions between transcription factors (TFs) and regulatory promoter regions. Plant organ boundaries separate lateral organs from the apical meristem and harbor axillary meristems (AMs). AMs, as stem cell niches, make the shoot a ramifying system. Although AMs have important functions in plant development, our knowledge of organ boundary and AM formation remains rudimentary. Here, we generated a ce ...[more]

PMID: 25358340

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Project description:The timing of reproductive development determines spike architecture and thus yield in temperate grasses such as barley (Hordeum vulgare L.). Reproductive development in barley is controlled by the photoperiod response gene Ppd-H1 which accelerates flowering time under long-day (LD) conditions. A natural mutation in Ppd-H1 prevalent in spring barley causes a reduced photoperiod response, and thus, late flowering under LD. However, it is not very well understood how LD and Ppd-H1 control pre-anthesis development, and thus spike architecture and yield in barley. We performed a detailed morphological analysis of the pre-anthesis development in the spring barley cultivar Scarlett and its wild barley derived introgression line S42-IL107, carrying the photoperiod responsive Ppd-H1 allele. Characterization of shoot apex development in these genotypes indicated that floral transition and initiation of floral primordia occurred under LD (16h light/ 8h dark) and short day (SD, 8h light/ 16h dark) conditions, while inflorescence and seed development strictly required LDs. Additionally, a fast photoperiod response in the presence of the dominant Ppd-H1 allele promoted floret fertility under LDs. To characterize the effects of the photoperiod and allelic variation at Ppd-H1 on gene expression during pre-anthesis development we performed RNA sequencing of leaves and developing main shoot apices during the vegetative phase and early stages of inflorescence development in Scarlett and S42-IL107 grown under SD and LD conditions. Main shoot apices of both genotypes were sampled at defined developmental stages, i.e. Waddington stage W0.5, W1.0, W2.0 and W3.5, respectively. Leaf samples were harvested from plants before (W1.0) and after floral transition (W2.0). We identified genes that were specifically regulated at floral transition independent of day-length and Ppd-H1 and thus may serve as markers for the staging of floral transition. Furthermore, we identified transcripts differentially expressed between photoperiods and between genotypes in leaves and in shoot apices. This set of transcripts might act as candidates downstream of Ppd-H1 and are correlated with the promotion of shoot apex development and higher floret fertility under LD and in the presence of the photoperiod responsive Ppd-H1 allele.

Dataset Information

Arabidopsis thaliana strain:Landsberg erecta Transcriptome or Gene expression

Publications

An organ boundary-enriched gene regulatory network uncovers regulatory hierarchies underlying axillary meristem initiation.

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