Ontology highlight
ABSTRACT:
PROVIDER: PRJNA855575 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR19976100_1.fastq.gz | Fastqsanger.gz | |||
| SRR19976100_2.fastq.gz | Fastqsanger.gz | |||
| SRR19976101_1.fastq.gz | Fastqsanger.gz | |||
| SRR19976101_2.fastq.gz | Fastqsanger.gz | |||
| SRR19976102_1.fastq.gz | Fastqsanger.gz |
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Project description:We performed a transcriptomic analysis on two tomato genotypes, M82 and Tondo, in response to a PEG-mediated osmotic treatment, mimicking water stress. The analysis was conducted separately on leaves and roots to characterize the specific response of these two organs. A total of 6,267 differentially expressed transcripts related to osmotic stress response was detected. The construction of gene co-expression networks defined the metabolic and signaling pathways of the common and specific responses of leaf and root. The common response was characterized by ABA-dependent and ABA-independent signaling pathways, and by the interconnection between ABA and JA signaling. The root specific response concerned genes involved in cell wall metabolism and remodeling, whereas the leaf specific response was principally related to leaf senescence and ethylene signaling. The transcription factors representing the hubs of these regulatory networks were identified. Some of them have not yet characterized and can represent novel candidates for tolerance. Finally, several genes showing a genotype-specific expression regulation in response to the treatment were detected. These genes may be involved in the different sensitivity to the osmotic treatment of the two tomato genotypes. In conclusion, this work shed new light on the regulatory networks occurring in tomato leaf and root under osmotic stress and set the base for an in-depth characterization of novel stress-related genes, that may represent potential candidates for improving tolerance to water stress in tomato.
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Project description:VERNALIZATION INSENSITIVE 3-LIKE (VIL) proteins are PHD-finger proteins that recruit the repressor complex Polycomb Repressive Complex 2 (PRC2) to the promoters of flowering repressors to promote flowering. Here, we show that the tomato VIL gene CRAWLING ELEPHANT (CREL) promotes differentiation throughout plant development and affects the trimethylation of Histone H3 on lysine 27 (H3K27me3) at a subset of PRC2 targets across the genome. We identified the crel mutant in a screen for suppressors of the simple-leaf phenotype of entire (e), a mutant in the AUX/IAA gene ENTIRE/SlIAA9, which is involved in compound-leaf development in tomato. crel mutants have increased leaf complexity, and suppress the ectopic blade growth of e mutants. In addition, crel mutants are late flowering, and have delayed and aberrant stem, root and flower development. Consistent with a role for CREL in recruiting PRC2, the H3K27me3 modification is altered at a subset of PRC2 targets throughout the genome in crel mutants. Our results uncover a wide role for CREL in plant and organ differentiation in tomato and suggest that CREL is required for targeting PRC2 activity, and thus silencing, to a specific subset of polycomb targets.
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Project description:Leaf and root transcriptome sequencing of tomato accessions
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Project description:Tomato seeds (S. lycopersicum ‘Fl Lanai’) were germinated under greenhouse conditions maintained at 24°C-29°C in flat trays (BWI Apopka, Catalog Number GPPF72S7X) filled with Sungro Horticulture soil (Metro-mix 830, BWI Apopka, Cat# TX830). Two weeks post emergence seedlings were transplanted to 4” pots using the same soil and transferred to a Conviron walk-in growth chamber (CMP6060) for the remainder of the experiment. Conviron conditions include a 14h/10h light/dark cycle maintained at 28°C, and plants were fertilized weekly (20-20-20). To prevent cross contamination, tomato plants were confined to insect proof cages at all times (BioQuip 1450NS68). Four weeks after transplanting, 40 whiteflies (B. tabaci MEAM1) were collected from virus free or Tomato Mottle Virus (ToMoV) established colonies via aspiration and moved into a clip cage placed on the 4th true leaf of each tomato plant as previously described38. Whiteflies were reared cabbage (Brassica oleracea), while viruliferous whiteflies were reared on ToMoV infected tomato from colonies established in the Polston lab. For all plants in this study, feeding was halted after 3 days of whitefly feeding (3 DPI) by gentle removal of clip cages and whitefly termination using insecticidal soap (Garden Safe, 1% of potassium salts of fatty acids). For the samples referred to as “local”, the tomato leaf bound within the clip cages was immediately removed and snap frozen for protein extraction. For the samples designated “systemic”, the plants were allowed to continue growing for 7 additional days after clip cage removal and whitefly termination, at which point the 9th leaf was excised and snap frozen. Plants used for collection of local leaves at 3 DPI were not used for the collection of systemic leaves 10 DPI. For both local and systemic leaves collected, we also included a no treatment control (NTC) that was subjected identically to clip cage and insecticidal soap applications, but without the addition of whitefly or ToMoV. Our experiment therefore consists of a no-treatment control (NTC), a whitefly treatment (+WF), and a viruliferous whitefly (+WFV) treatment for both local (4th true leaf, 3 DPI) and systemic leaves (9th true leaf, 10 DPI). The presence of ToMoV in all infected plants was confirmed via Nanopore sequencing. Briefly, Tomato genomic DNA was extracted from five systemic leaf samples using the PureGene tissue DNA isolation kit (product # 158667; QIAGEN, Valencia, CA, USA), following the manufacturer’s protocol and stored at -80°C until needed. Library preparation was performed using the Rapid Sequencing Kit RBK004 protocol (Oxford Nanopore Technologies) and loaded onto a 9.4.1 flow cell in a MinION connected to a MinIT with live base calling enabled. Resulting sequencing reads for each sample were mapped to both ToMoV A component (GenBank accession: L14460) and ToMoV B component (GenBank accession: L14461) sequences.
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