Transcriptome analysis of auxin-regulated genes in Ceratopteris richardii sporophytes
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ABSTRACT:
ORGANISM(S): Ceratopteris richardii
PROVIDER: GSE134602 | GEO | 2019/07/23
REPOSITORIES: GEO
Similar Datasets
Project description:Lateral root initiation was used as a model system to study the mechanisms behind auxin-induced cell division. Genome-wide transcriptional changes were monitored during the early steps of lateral root initiation. Inclusion of the dominant auxin signaling mutant solitary root1 (slr1) identified genes involved in lateral root initiation that act downstream of the AUX/IAA signaling pathway. Interestingly, key components of the cell cycle machinery were strongly defective in slr1, suggesting a direct link between AUX/IAA signaling and core cell cycle regulation. However, induction of the cell cycle in the mutant background by overexpression of the D-type cyclin (CYCD3;1) was able to trigger complete rounds of cell division in the pericycle that did not result in lateral root formation. Therefore, lateral root initiation can only take place when cell cycle activation is accompanied by cell fate respecification of pericycle cells. The microarray data also yielded evidence for the existence of both negative and positive feedback mechanisms that regulate auxin homeostasis and signal transduction in the pericycle, thereby fine-tuning the process of lateral root initiation. Keywords: time-course wild type vs mutant comparison
2005-11-01 | GSE3350 | GEO
Project description:Lateral root initiation was used as a model system to study the mechanisms behind auxin-induced cell division. Genome-wide transcriptional changes were monitored during the early steps of lateral root initiation. Inclusion of the dominant auxin signaling mutant solitary root1 (slr1) identified genes involved in lateral root initiation that act downstream of the AUX/IAA signaling pathway. Interestingly, key components of the cell cycle machinery were strongly defective in slr1, suggesting a direct link between AUX/IAA signaling and core cell cycle regulation. However, induction of the cell cycle in the mutant background by overexpression of the D-type cyclin (CYCD3;1) was able to trigger complete rounds of cell division in the pericycle that did not result in lateral root formation. Therefore, lateral root initiation can only take place when cell cycle activation is accompanied by cell fate respecification of pericycle cells. The microarray data also yielded evidence for the existence of both negative and positive feedback mechanisms that regulate auxin homeostasis and signal transduction in the pericycle, thereby fine-tuning the process of lateral root initiation. Experiment Overall Design: Seedlings of both wild type (Col-0) and the lateral root defective mutant (slr-1) were germinated on MS medium supplemented with 10μM NPA (=auxin transport inhibitor). Three days after germination, such seedlings were transferred to MS supplemented with 10μM NAA for 0h, 2h and 6h respectively. The segment between root meristem and root-hypocotyl junction was harvested from about 1500 seedling per time point. All treatments were repeated biologically. 5.8 μg total RNA was used for the preparation of biotinylated cRNA. Labeled RNA was hybridised to ATH1 Affymetrix chips. The resulting data was MAS5.0 normalised.
2007-07-13 | E-GEOD-3350 | biostudies-arrayexpress
Project description:Gene expression profile of response to auxin at 3 h after treatment in rice root tips: IR64 (loss-of-function of DRO1 type) vs Near-isogenic line homozygous for the Kinandang Patong allele of DRO1 in an IR64 genetic background (Dro1-NIL; gain-of-function of DRO1 type) We used two rice varieties, IR64 and near-isogenic line homozygous for the Kinandang Patong allele of DRO1 in an IR64 genetic background (Dro1-NIL). We performed comprehensive microarray analysis of rice root tips with auxin treatment (3h) and pre-treatment (0h) in IR64 and Dro1-NIL. Seedling root tips of IR64 and Dro1-NIL were treated with 10 M-BM-5M 2,4-D. n = 3 biological repeats (15 seedlings per repeat).
2013-05-07 | E-GEOD-46255 | biostudies-arrayexpress
Project description:The aim of the experiment is to identify Ectocarpus siliculosus (strain Ec32) genes which are up- or down-regulated by auxin. RNAs were extracted from sporophytes treated with auxin NAA 5.10-6M for 30min or 3h, and labelled either with Cy3 or Cy5. Biological triplicates were performed.
2008-12-15 | E-MEXP-1716 | biostudies-arrayexpress
Project description:Reduced glutathione (GSH) is required for cell cycle initiation and auxin-regulated root meristem development. Transcriptome profiling of the roots and shoots of the root meristemless 1 (rml1) mutant, which has about 3% of the wild type GSH, revealed a divergent auxin and strigolactone response linked to the arrest of the cell cycle.
2013-01-10 | GSE36893 | GEO
Project description:We found that auxin stimulates gene expression of DWF4, which encodes a rate-dertermining step in brassinosteroid biosynthesis pathways. This increased gene expressioin subsequently led to elevation of the biosynthetic flux in Arabidopsis roots. To determine the list of genes that are regulated by auxin-synthesizing brassinosteroids, we challenged Arabidopsis seedlings with either auxin only or auxin plus brassinosteroid biosynthetic inhibitor brassinazole. Keywords: Hormone treatment Arabidopsis seedlings (Columbia ecotype) were grown for 10 d on 1× MS agar-solidified media under long-day conditions (16:8, white light and dark cycle). The seedlings were then transferred to 2 different liquid media containing either 10–7 M 2,4-D or 10–7 M 2,4-D plus 10–6 M brassinazole. After 8 h of treatment, the seedlings were blotted with paper towels to remove excess media and subject to total RNA isolation. Total RNAs isolated from each batch were prepared from 3 replicate seedlings using an RNeasy plant mini kit (Qiagen, Germany).
2011-02-15 | E-GEOD-12964 | biostudies-arrayexpress
Project description:We performed an analysis of transcriptomic responses to auxin within four distinct tissues of the Arabidopsis thaliana root. This high-resolution dataset shows how different cell types are predisposed to react to auxin with discrete transcriptional responses. The sensitivity provided by the analysis lies in the ability to detect cell-type specific responses diluted in organ-level analyses. This dataset provides a novel resource to examine how auxin, a widespread signal in plant development, influences differentiation and patterning in the plant through tissue-specific transcriptional regulation. To analyze the effect of auxin in separate spatial domains of the root, early transcriptional changes in response to auxin treatment were assayed by means of fluorescence activated cell sorting (FACS) and microarray analysis in four tissues of the Arabidopsis root (wild type Col-0). The samples covered inner and outer as well as proximal and distal cell populations; including the stele (reporter line pWOL::GFP), xylem-pole (xp) pericycle (enhancer trap line E3754), epidermis/lateral root cap (reporter line pWER::GFP) and columella (enhancer trap line PET111). One-week-old seedlings of the individual lines were treated with auxin (two hours, 5µM indole-3-acetic acid [IAA]) or mock treated, after which roots were harvested and cells were dissociated by cell wall digestion (1 hour; including 5uM IAA) . GFP-positive cells were sorted and used for microarray transcriptome analysis (as in Bargmann and Birnbaum, Plant Phys. 2010). For comparison, transcriptional responses to auxin were also assayed in intact (undigested) roots.
2013-08-06 | E-GEOD-35580 | biostudies-arrayexpress
Project description:To study genes specially expressed in root tip, leaf tip, shoot tip, root (without root tip) and leaf (without leaf tip) of Ceratopteris richardii, we carried out an RNA-seq to analyze gene expression levels from these five tissues.
2019-10-22 | GSE139160 | GEO
Project description:The acquisition of water and nutrients by plant roots is a fundamental aspect of agriculture and strongly depends on root architecture. Root branching and expansion of the root system is achieved through the development of lateral roots and is to a large extent controlled by the plant hormone auxin. However, the pleiotropic effects of auxin or auxin-like molecules on root systems complicate the study of lateral root development. Here we describe a small-molecule screen in Arabidopsis thaliana that identified naxillin as what is to our knowledge the first non-auxin-like molecule that promotes root branching. By using naxillin as a chemical tool, we identified a new function for root cap-specific conversion of the auxin precursor indole-3-butyric acid into the active auxin indole-3-acetic acid and uncovered the involvement of the root cap in root branching. Delivery of an auxin precursor in peripheral tissues such as the root cap might represent an important mechanism shaping root architecture. To further explore the specificity of naxillin for lateral root development, we compared the early effects of naxillin at the transcriptome level with NAA (1-Naphthaleneacetic acid) in roots of 3-day-old seedlings after 2-h and 6-h treatment.
2012-12-18 | GSE42896 | GEO
Project description:Reduced glutathione (GSH) is required for cell cycle initiation and auxin-regulated root meristem development. Transcriptome profiling of the roots and shoots of the root meristemless 1 (rml1) mutant, which has about 3% of the wild type GSH, revealed a divergent auxin and strigolactone response linked to the arrest of the cell cycle. Plants of the rml1 mutant and Columbia-0 ecotype were harvested and separated into roots and shoots, then RNA extraction and Affymetrix Agronomics Tiling Array were performed.
2013-01-10 | E-GEOD-36893 | biostudies-arrayexpress