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A transcript profile of Medicago truncatula root meristem cells

ABSTRACT: The root apical meristems (RAM) is established during embryogenesis and serves as a source of stem cells for plant growth and organogenesis. Young roots have a simple structure and meristeamtic and non-meristematic cells can be differentiated based on their location. We have used the Affymetrix Medicago Genome Array GeneChip to compare tissue from the root meristem and non-meristematic tissue to identify meristem specific candidate genes based on changes in gene expression before and after differentiation Keywords: Cell type comparison

ORGANISM(S): Medicago sativa Medicago truncatula Sinorhizobium meliloti

PROVIDER: GSE8115 | GEO | 2007/07/01

SECONDARY ACCESSION(S): PRJNA100987

REPOSITORIES: GEO

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Transcription profiling of Medicago truncatula root meristem cells

Project description:The root apical meristems (RAM) is established during embryogenesis and serves as a source of stem cells for plant growth and organogenesis. Young roots have a simple structure and meristeamtic and non-meristematic cells can be differentiated based on their location. We have used the Affymetrix Medicago Genome Array GeneChip to compare tissue from the root meristem and non-meristematic tissue to identify meristem specific candidate genes based on changes in gene expression before and after differentiation Experiment Overall Design: Roots were sectioned separating meristematic (root-tip) and non-meristematic root tissue; total RNA was extracted and used for hybridization to Affymetrix arrays

2008-06-16 | E-GEOD-8115 | biostudies-arrayexpress

Cell- and tissue-specific transcriptome analyses of Medicago truncatula root nodules

2013-05-29 | GSE43354 | GEO

RNA-seq insights into primary root apical meristem exhaustion and determinate root growth in Pachycereus pringlei (Cactaceae)

Project description:Many Cactaceae species exhibit determinate growth of the primary root as a consequence of root apical meristem (RAM) exhaustion. The genetic regulation of this root growth pattern is unknown. We de novo assembled and annotated the root apex transcriptome of the Pachycereus pringlei primary root at three developmental stages with active or exhausted RAM. The assembled transcriptome was characterized and used to evaluate differential transcript expression, identify RT-qPCR reference genes, and infer a transcriptional regulatory network. We generated a robust and comprehensive transcriptome of the primary root apex of P. pringlei and identified putative orthologs of Arabidopsis regulators of RAM maintenance, as well as putative lineage-specific transcripts. Furthermore, the transcriptome contained putative orthologs of most proteins involved in housekeeping processes, hormone signaling, and metabolic pathways. Specific transcriptional programs operate in the root apex at specific developmental time points. The transcriptional state of the P. pringlei root apex as the RAM becomes exhausted is comparable to that of cells from the meristematic, elongation, and differentiation zones of Arabidopsis roots. We suggest that the genetic program underlying the drought stress response is induced during development of the Cactaceae root, and that lineage-specific transcripts could contribute to root apical meristem exhaustion in Cactaceae.

2018-05-25 | GSE104832 | GEO

Medicago truncatula

Project description:A transcript profile of Medicago truncatula root meristem cells

| PRJNA100987 | ENA

The Class VIII myosin ATM1 is integral for root apical meristem function

Project description:Myosins are evolutionarily conserved motor proteins that interact with actin filaments to regulate organelle transport, cytoplasmic streaming and cell growth. Plant specific Class XI myosin proteins direct cell division and root organogenesis. However, the roles of Class VIII myosin proteins in plant growth and development are less understood. Here, we investigated the function of an auxin-regulated Class VIII myosin, Arabidopsis thaliana Myosin 1 (ATM1), using genetics and live cell microscopy. ATM1 is a plasmodesmata-localized protein that is enriched in actively dividing cells in the root apical meristem (RAM). Loss of ATM1 function results in impaired primary root growth due to decreased RAM size and reduced cell proliferation in a sugar dependent manner. Examination of stem cell marker line expression in atm1-1 indicated impaired division of the lateral root cap and columella cells and a diminished auxin response. Transcriptome analysis of atm1-1 linked these growth defects to dysregulation of cell cycle and auxin pathway genes. Complementation of ATM1 loss-of- function mutant restored root growth and cell cycle progression in the root meristem. Collectively, these results provide novel evidence that ATM1 functions to influence cell proliferation and differentiation in primary roots in response to auxin and sugar cues.

2023-06-08 | GSE200917 | GEO

Cell- and tissue-specific transcriptome analyses of Medicago truncatula root nodules

Project description:We used laser-capture microdissection (LCM) to isolate specific cells from the Medicago truncatula nodule meristem (M), the distal infection (DIZ), the proximal infection zone (PIZ), infected cells (IC) and uninfected cells (UIC) from the fixation zone. Based on Medicago GeneChips, we identified the cell- and tissue-specific programm of gene expression in Medicago truncatula root nodules. Nodules were harvested three weeks after inoculation of Medicago truncatula (genotype Jemalong A17) plants with Sinorhizobium meliloti strain 2011. Nodules were fixed in Farmer's fixative and subsequently embedded in paraffin. 8 M-BM-5m de-paraffined sections were used to capture cells from the nodule meristem, distal infection zone, proximal infection zone, infected cells and uninfected cells from the fixation zone, using an Arcturus Pixcell II laser capture microscope. 3 biological replicates were used for each cell-/tissue type. After RNA extraction, the RNA was amplified and used for Medicago Gene Chip hybridization.

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microRNA profiling of root tissues and root forming explant cultures in Medicago truncatula

Project description:To identify key miRNAs involved in root meristem formation in M. truncatula, deep sequencing was used to compare the miRNA populations dreived from four tissues. These were; root tip tissue, containing the root apical meristem, elongation zone tissue, root forming callus tissue and non-root forming callus tissue. We identified 83 previously reported miRNAs, 24 new to M. truncatula, in 44 families. For the first time in M. truncatula, members of conserved miRNA families mir165, miR181 and miR397 were found. Bioinformatic analysis identified 38 potential novel miRNAs. Many miRNAs were differentially expressed between tissues, particularly RFC and NRFC. Examination and comparison of the microRNA population of four Medicago truncatula tissue types

2013-04-03 | E-GEOD-45726 | biostudies-arrayexpress

The single-cell transcriptome program of nodule development cellular lineages in Medicago truncatula

Project description:Medicago truncatula engages in root nodule symbiosis by developing a de novo plant organ (known as nodule) in its roots in response to the infection by rhizobia. These nodules are de novo plant organs that provide an optimal environment for the rhizobia to fix nitrogen in exchange for photosynthates. The establishment of root nodule symbioses (RNS) requires the coordination of two distinct processes: bacterial infection and nodule organogenesis. In this study we used single-cell RNA-seq to investigate the first hours of the establishment of the root nodule symbiosis aiming to identify the transcriptional mechanisms governing this process.

2024-01-17 | GSE224539 | GEO

Expression data of Soybean root apical meristem and leaf

Project description:we used soybean genome chips to investigate the expression pattern of about 37,500 unique ESTs locating on soybean Affymetrix chips (Affymetrix Inc.). KEYWORDS: Tissue comparison we compared soybean root meristem samples with non-meristematic tissues in 10 days old vegetative stage seedlings to define a unique set of root meristem enriched genes.

2011-05-31 | E-GEOD-27894 | biostudies-arrayexpress

High-resolution gene expression datasets of ontogenetic zones in the root apical meristem

Project description:In plants, apical meristems allow continuous growth along the body axis. Within the root apical meristem (RAM), a group of slowly dividing quiescent center (QC) cells is thought to limit stem cell activity to directly neighboring cells (Cowels, 1956; van den Berg et al., 1997), thus endowing them with unique properties, distinct from displaced daughters. This binary identity of the stem cells stands in apparent contradiction with the more gradual changes in cell division potential (Bennett and Scheres, 2010) and differentiation (Yamaguchi et al., 2008; 2010; Furuta et al, 2014; Geldner, 2013; Masucci et al., 1996; Dolan and Costa, 2001) that occur as cells move further away from the QC. To address this paradox and to infer molecular organization of the root meristem, we used a whole-genome approach to determine dominant transcriptional patterns along root ontogeny zones. We found that the prevalent patterns are expressed in two opposing gradients. One is characterized by genes associated with development, the other enriched in differentiation genes. We confirmed these transcript gradients, and demonstrate that these translate to gradients in protein accumulation and gradual changes in cellular properties. We also show that gradients are genetically controlled through multiple pathways. Based on these findings, we propose that cells in the Arabidopsis root meristem gradually transition from ‘stemness’ towards differentiation.

2017-10-03 | GSE98097 | GEO

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