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ABSTRACT: MYB74 transcription factor guides de novo specification of epidermal cells in the abscission zone of Arabidopsis

PROVIDER: PRJNA1032145 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR26521466_1.fastq.gz	Fastqsanger.gz
	SRR26521466_2.fastq.gz	Fastqsanger.gz
	SRR26521467_1.fastq.gz	Fastqsanger.gz
	SRR26521467_2.fastq.gz	Fastqsanger.gz
	SRR26521468_1.fastq.gz	Fastqsanger.gz

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Project description:De novo specification of epidermal cells in abscission zone furthers post-abscission cell growth

| PRJNA1013602 | ENA

A Lignin Molecular Brace Controls Precision Processing of Cell Wall Critical for Surface Integrity in Arabidopsis

Project description:The cell wall is a defining feature of plant cells and glues cells to each other. To overcome this physical constraint, plants must process and disconnect cell wall linkages during growth and development. However, little is known about the mechanism guiding cell-cell detachment and cell wall remodeling. Here, we identify two neighboring cell types in Arabidopsis that coordinate their activities to control cell wall processing, thereby ensuring precise abscission to discard organs. One cell type produces a honeycomb structure of lignin, which acts as a mechanical ‘brace’ to localize cell wall breakdown and spatially limit abscising cells. The second cell type undergoes transdifferentiation into epidermal cells, forming protective cuticle, demonstrating de novo specification of epidermal cells, previously thought to be restricted to embryogenesis. Loss of the lignin brace leads to inadequate cuticle formation, resulting in surface barrier defects and susceptible to infection. Altogether, we show how plants precisely accomplish abscission.

2018-12-31 | GSE110213 | GEO

Transcriptome responses in the abscission, distal and proximal regions of the flower pedicel during shedding of flower in Euphorbia pulcherrima

Project description:The aim of this study is to assess the global transcriptome changes during the shedding of the flower, which normally takes around 6 or 7 days. We selected four time points (from day 0 to day 6) and three different tissues within the flower bud; distal, abscission and proximal zones with three biological replicates. RNA extraction, library prep and paired end sequencing was performed. Our special interest is try to describe the changes in the abscission zone and the two adjacent tissues in order to get a whole picture of the shedding process. We performed a de novo assembly by Trinity and detected the transcripts and expression changes across spatial and temporal comparisons.

2017-12-31 | E-MTAB-6282 | biostudies-arrayexpress

Project description:Arabidopsis abscission zone stage RNA

| PRJNA786431 | ENA

Transcription profiling of laser-microdissected cells from laminar abscission zone and petiolar cortical tissue during ethylene-promoted abscission in citrus leaves

Project description:Transcription profiling of the ethylene-induced abscission process in laminar abscission zone cells and petiolar cortical cells of debladed mature citrus leaf explants. Samples taken at 24h after ethylene treatment (10 ul/l) were compared.

2009-10-31 | E-MEXP-2018 | biostudies-arrayexpress

Transcription profiling of petioles and laminar abscission zone enriched tissues from Citrus clementina following ethylene treatment

Project description:Transcription profiling of the ethylene-induced abscission process in laminar abscission zone enriched tissues and petiole of debladed mature citrus leaf explants. Samples taken at 0, 6, 12, 24 and 36h after ethylene treatment (10 ul/l) were compared.

2008-12-31 | E-MEXP-1428 | biostudies-arrayexpress

Transcriptional profiling of calyx abscission zone cells of citrus fruits and adjacent fruit rind cells during ethylene-promoted fruit abscission

Project description:Abscission is a cell separation process that takes place in particular positions of the plant body named abscission zones. In citrus, maturing fruits are shed through the calix abscission zone, which is composed by 10-15 cell layers located at the boundary between the calyx button and the fruit rind. In order to gain further insight into the molecular mechanisms involved in citrus fruit abscission, we used laser microdissection combined with microarray analysis to compare the global expression profiles of calyx abscission zone cells and adjacent fruit rind cells (control cells) at 0, 12 and 24 hours after the activation of the process with ethylene. Thus, this study allowed identifying a set of abscission zone-specifically expressed genes potentially involved in citrus fruit abscission.

2017-02-08 | E-MTAB-4538 | biostudies-arrayexpress

INFLORESCENCE DEFICIENT IN ABSCISSION (IDA) and its receptors HAE/HSL2 are required for cell expansion and cell separation during floral organ abscission in Arabidopsis thaliana (part 2)

Project description:Plants have the ability to shed organs that are no longer in use. In Arabidopsis thaliana abscission of floral organs involves cell wall remodeling and cell expansion prior to cell wall dissolution. IDA encodes a secreted peptide that signals through the leucine-rich repeat receptor-like kinases (LRR-RLKs) HAESA (HAE) (At4g28490) and HASEA-LIKE2 (HSL2) (At5g65710). Arabidopsis thaliana (ecotype Colombia-0) plants were kept in growth chambers with a 16/8 h (light/dark) photoperiod at 22 M-BM-0C, and 100 mE m-2 s-1 light intensity. 4 biological replicates were prepared from each sample, each containing abscission zone regions of siliques position 4 to 8 (when counting from the flowe at anthesis at the top of the inflorescence) from plants with at least 20 siliques. Differences in transcriptional responses were measured by comparing genes expression in abscission zones of ida-2 plants (SALK_133209) against abscission zones from control plants.

2013-12-30 | E-GEOD-48107 | biostudies-arrayexpress

INFLORESCENCE DEFICIENT IN ABSCISSION (IDA) and its receptors HAE/HSL2 are required for cell expansion and cell separation during floral organ abscission in Arabidopsis thaliana (part 1)

Project description:Plants have the ability to shed organs that are no longer in use. In Arabidopsis thaliana abscission of floral organs involves cell wall remodeling and cell expansion prior to cell wall dissolution. IDA encodes a secreted peptide that signals through the leucine-rich repeat receptor-like kinases (LRR-RLKs) HAESA (HAE) (At4g28490) and HASEA-LIKE2 (HSL2) (At5g65710). Arabidopsis thaliana (ecotype Colombia-0) plants were kept in growth chambers with a 16/8 h (light/dark) photoperiod at 22 M-BM-0C, and 100 mE m-2 s-1 light intensity. 4 biological replicates were prepared from each sample, each containing abscission zone regions of siliques position 4 to 8 (when counting from the flowe at anthesis at the top of the inflorescence) from plants with at least 20 siliques. Differences in transcriptional responses were measured by comparing genes expression in abscission zones of hae hsl2 plants (SALK_021905 x SALK_030520) against abscission zones from control plants.

2013-12-30 | E-GEOD-48106 | biostudies-arrayexpress

A single RRM domain-containing protein SARP1 is required for the separation zone establishment in Arabidopsis

Project description:Abscission is a developmental process that sheds organs in response to developmental and environmental cues. Abscission involves cell separation between two neighboring cell types in the abscission zone (AZ), residuum cells (RECs) and secession cells (SECs). However, the regulatory mechanisms for spatial determination governing cell separation are poorly understood. BREVIPEDICELLUS (BP) is one of the key transcription factors regulating the AZ cell size and number. To identify molecular components of abscission, we performed a genetic screen using a weak complementation line of bp-3 carrying activation T-DNA tagging. We identified an ebp1 (enhancer of bp1) mutant displaying delayed floral organ abscission. The ebp1 mutants show concaved surface in SECs and abnormally stacked cells on the top of RECs, in contrast to the precisely separated surface in WT. Molecular and histological analyses revealed that the transcriptional programming during cell differentiation in the AZ is compromised in the ebp1 mutant, where SECs of the ebp1 mutant appear to acquire REC-like activities, including cuticle formation and superoxide production. Here we present that SEPARATION AFFECTING RNA-BINDING PROTEIN1 (SARP1) is up-regulated in ebp1 and plays a role in the establishment of the cell separation layer during floral organ abscission in Arabidopsis.

2024-07-23 | GSE216148 | GEO

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