OsDCL1a activation impairs phytoalexin biosynthesis and compromises disease resistance in rice
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ABSTRACT:
PROVIDER: PRJNA430393 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
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| SRR6498700.fastq.gz | Fastqsanger.gz | |||
| SRR6498710.fastq.gz | Fastqsanger.gz | |||
| SRR6498701.fastq.gz | Fastqsanger.gz | |||
| SRR6498711.fastq.gz | Fastqsanger.gz | |||
| SRR6498702.fastq.gz | Fastqsanger.gz |
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Project description:OsDCL1a activation impairs phytoalexin biosynthesis and compromises disease resistance in rice [RNA-seq]
| PRJNA430396 | ENA
Project description:OsDCL1a activation impairs phytoalexin biosynthesis and compromises disease resistance in rice [ncRNA-seq]
| PRJNA430392 | ENA
Project description:MicroRNAs (miRNAs) are small non-coding RNAs that act as post-transcriptional regulators of gene expression via sequence-specific cleavage or translational repression of target transcripts. They are transcribed as long single-stranded RNA precursors with unique stem-loop structures that are processed by a DICER-Like (DCL) ribonuclease, typically DCL1, to produce mature miRNA sequences. Here, we investigated the contribution of OsDCL1 to innate immunity in rice. Activation-tagged dcl1a mutants (dcl1a-Ac) showed enhanced susceptibility to infection by the fungal pathogens Magnaporthe oryzae and Fusarium fujikuroi. Susceptibility to pathogen infection in dcl1a-Ac plants was associated with weaker induction of defence gene expression. Plant growth and development were not affected in dcl1a-Ac plants in the absence of pathogen challenge. To analyse the impact of OsDCL1a activation on the host transcriptome, we compared the mRNA and miRNA transcriptomes of dcl1a-Ac and wild-type plants. OsDCL1a activation misregulated genes involved in detoxification of reactive oxygen species (ROS) and accumulation of O2•- in leaves. Consequently, dcl1a-Ac plants were more sensitive to oxidative stress caused by methyl viologen treatment. Notably, transcriptome analysis revealed downregulation of diterpenoid phytoalexin biosynthetic genes in dcl1a-Ac, the expression of these genes also being weakly induced during pathogen infection in these plants. Finally, OsDCL1a activation resulted in marked alterations in the rice miRNAome, including both upregulation and downregulation of miRNAs. Our findings support that OsDCL1a plays an important role in regulating innate immunity in rice.
2018-09-05 | GSE109303 | GEO
Project description:MicroRNAs (miRNAs) are small non-coding RNAs that act as post-transcriptional regulators of gene expression via sequence-specific cleavage or translational repression of target transcripts. They are transcribed as long single-stranded RNA precursors with unique stem-loop structures that are processed by a DICER-Like (DCL) ribonuclease, typically DCL1, to produce mature miRNA sequences. Here, we investigated the contribution of OsDCL1 to innate immunity in rice. Activation-tagged dcl1a mutants (dcl1a-Ac) showed enhanced susceptibility to infection by the fungal pathogens Magnaporthe oryzae and Fusarium fujikuroi. Susceptibility to pathogen infection in dcl1a-Ac plants was associated with weaker induction of defence gene expression. Plant growth and development were not affected in dcl1a-Ac plants in the absence of pathogen challenge. To analyse the impact of OsDCL1a activation on the host transcriptome, we compared the mRNA and miRNA transcriptomes of dcl1a-Ac and wild-type plants. OsDCL1a activation misregulated genes involved in detoxification of reactive oxygen species (ROS) and accumulation of O2•- in leaves. Consequently, dcl1a-Ac plants were more sensitive to oxidative stress caused by methyl viologen treatment. Notably, transcriptome analysis revealed downregulation of diterpenoid phytoalexin biosynthetic genes in dcl1a-Ac, the expression of these genes also being weakly induced during pathogen infection in these plants. Finally, OsDCL1a activation resulted in marked alterations in the rice miRNAome, including both upregulation and downregulation of miRNAs. Our findings support that OsDCL1a plays an important role in regulating innate immunity in rice.
2018-09-05 | GSE109299 | GEO
Project description:Background and aimsMicroRNAs (miRNAs) are small non-coding RNAs that act as post-transcriptional regulators of gene expression via sequence-specific cleavage or translational repression of target transcripts. They are transcribed as long single-stranded RNA precursors with unique stem-loop structures that are processed by a DICER-Like (DCL) ribonuclease, typically DCL1, to produce mature miRNAs. Although a plethora of miRNAs have been found to be regulated by pathogen infection in plants, the biological function of most miRNAs remains largely unknown. Here, the contribution of OsDCL1 to rice immunity was investigated.MethodsActivation-tagged Osdcl1a (Osdcl1a-Ac) rice mutants were examined for resistance to pathogen infection. mRNA and small RNA deep sequencing, quantitative real-time PCR (RT-qPCR) and stem-loop reverse tanscripion-PCR (RT-PCR) were used to examine DCL1a-mediated alterations in the rice transcriptome. Rice diterpene phytoalexins were quantified by liquid chromatography-tandem mass spectrometry (LC-MSMS). Accumulation of O2·- was determined by nitroblue tetrazolium (NBT) staining.Key resultsdcl1a-Ac mutants exhibit enhanced susceptibility to infection by fungal pathogens which was associated with a weaker induction of defence gene expression. Comparison of the mRNA and miRNA transcriptomes of dcl1a-Ac and wild-type plants revealed misregulation of genes involved in detoxification of reactive oxygen species. Consequently, dcl1a-Ac plants accumulated O2·- in their leaves and were more sensitive to methyl viologen-induced oxidative stress. Furthermore, dcl1a-Ac plants showed downregulation of diterpenoid phytoalexin biosynthetic genes, these genes also being weakly induced during pathogen infection. Upon pathogen challenge, dcl1a-Ac plants failed to accumulate major diterpenoid phytoalexins. OsDCL1a activation resulted in marked alterations in the rice miRNAome, including both upregulation and downregulation of miRNAs.ConclusionsOsDCL1a activation enhances susceptibility to infection by fungal pathogens in rice. Activation of OsDCL1a represses the pathogen-inducible host defence response and negatively regulates diterpenoid phytoalexin production. These findings provide a basis to understand the molecular mechanisms through which OsDCL1a mediates rice immunity.
| S-EPMC6344094 | biostudies-literature
Project description:This SuperSeries is composed of the SubSeries listed below.
2018-09-05 | GSE109307 | GEO
Project description:The OsbZIP23 transcription factor has been characterized for its essential role in drought resistance in rice, but the mechanism is unknown. Here, we performed genome-wide identification of OsbZIP23 targets by immunoprecipitation sequencing (ChIP-seq) and RNA Sequencing (RNA-Seq) analyses in the OsbZIP23-overexpression, osbzip23 mutant, and wild-type rice under normal and drought stress conditions. OsbZIP23 directly regulates a large number of reported genes that function in stress response, hormone signaling, and developmental processes. Among these targets, we found that OsbZIP23 could positively regulate OsPP2C49, and overexpression of OsPP2C49 in rice resulted in significantly decreased sensitivity of the ABA response and rapid dehydration. Moreover, OsNCED4 (9-cis-epoxycarotenoid dioxygenase 4), a key gene in ABA biosynthesis, was also positively regulated by OsbZIP23. Together, our results suggest that OsbZIP23 acts as a central regulator in ABA signaling and biosynthesis, and drought resistance in rice.
2016-08-13 | GSE81462 | GEO
Project description:Gene expression in response to Cu stress in rice leaves was quantified using DNA microarray (Agilent 22K Rice Oligo Microarray) and real-time PCR technology. Rice plants were grown in hydroponic solutions containing 0.3 (control), 10, 45 or 130 µM of CuCl2, and Cu accumulation and photosynthesis inhibition were observed in leaves within 1 day of the start of treatment. Microarray analysis flagged 305 Cu-responsive genes, and their expression profile showed that a large proportion of general and defense stress response genes are up-regulated under excess Cu conditions, whereas photosynthesis and transport-related genes are down-regulated. The Cu sensitivity of each Cu-responsive gene was estimated by the median effective concentration value (EC50) and the range of fold-changes (F) under the highest (130 µM) Cu conditions (|log2F|130). Defense-related genes involved in phytoalexin and lignin biosynthesis were the most sensitive to Cu. Our results indicate that plant management of abiotic and pathogen stresses has overlapping components, possibly including signal transduction. Keywords: dose response, stress response
2008-04-30 | GSE11021 | GEO
Project description:Seedlings blight is one of the destructive diseases of rice, caused by the fungus Fusarium oxysporum, which impairs rice productions. Fluoro-substituted benzothiadiazole derivatives (FBT) and chitosan oligosaccharide (COS) are elicitors that can enhance plant resistance to pathogen infection. However, there is a lack of information regarding FBT and COS used as elicitors in rice seedlings blight. Therefore, the aim of this study was to evaluate the effect of FBT and COS treatments against rice seedling blight and elucidate the possible molecular mechanisms of the two elicitors for inducing resistance by proteomics. The results showed that FBT and COS significantly reduced the disease incidence and index, and improved the growth status of rice root caused by F. oxysporum. Biochemical analysis demonstrated that the two elicitors effectively enhanced activities of defense enzymes. Moreover, proteomic profiling analysis of rice root tissues disclosed more differentially expressed proteins in diterpenoid biosynthesis pathway induced by the two elicitors compared with other biological pathways, resulting in the accumulation of antimicrobial substance--momilactone. This study provided the basis of theory and application for FBT and COS used as rice elicitors against seedling blight on roots.
2019-08-12 | PXD014979 |
Project description:Drought is a major environmental constraint affecting physiological, biochemical and molecular changes of crops, causing loss in crop productivities. Understanding the molecular mechanisms of drought tolerance is important for crop biotechnology. Here, we report that the rice (Oryza sativa) homeodomain-leucine zipper class IV transcription factor gene, Rice outermost cell-specific gene 10 (Roc10), improves drought tolerance and grain yield by increasing lignin accumulation in ground tissues of rice plants. Overexpression of Roc10 significantly enhanced drought tolerance of transgenic rice plants at the vegetative stages of growth with highly effective photosystem and reduction of water loss rate as compared with non-transgenic control and RNAi plants. More importantly, Roc10 overexpression plants had higher drought tolerance at the reproductive stage of growth with higher grain yield over controls under field-drought conditions. We identified downstream and putative target genes of Roc10 by using RNA-seq and ChIP-seq data of rice shoots. Roc10 overexpression elevated the expression levels of lignin biosynthetic genes in shoots with a concomitant increase in accumulation of lignin. The overexpression and RNAi lines showed opposite patterns of lignin accumulation. The Roc10 is mainly expressed in the outer cell layers including epidermis and vasculature of shoots that coincides with areas of increased lignification. Furthermore, the Roc10 was found to directly bind to the promoter of PEROXIDASEN/PEROXIDASE38, a key gene in lignin biosynthesis. Together, our findings suggested that the Roc10 confers drought stress tolerance by enhancing lignin biosynthesis in ground tissues of rice plants.
2018-01-06 | GSE93287 | GEO