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Analysis of the effect of exogenous auxin on the regulatory relationship between miRNA and its target genes in rose using high-throughput sequencing

ABSTRACT: Rose (Rosa hybrida L.) is a major cut flowers in the world. Studying the molecular mechanism of auxin regulation in growth is of great significance for enhancing the understanding of the growth and development processes of rose and informing accurate exogenous auxin application in rose production. However, the response mechanism of rose to miRNA-mediated auxin signal transduction is unclear. In this study, rose plants were treated with IAA, and 75 known miRNAs and 168 novel miRNAs were identified by small RNA sequencing. Among them, 19 known miRNAs and 42 miRNAs were differentially expressed. Many differential miRNAs demonstrated staged responses to auxin treatment. The targeted relationship between miRNA and key transcription factors regulated by auxin in rose was analyzed, and the target genes in the ARF family and AUX/IAA family were screened. By using quantitative real-time PCR(qRT-PCR) to verify the expression patterns of the miRNA regulating the auxin signal transduction pathway and its target gene, we found that miR156a, miR160a, miR164a, miR167d, miR396b-3p, novel_miR_189, novel_miR_74, novel_miR_8, and novel_miR_207 interacted negatively with the ARF family, and miR390a-3p and novel_miR_101 interacted negatively with the AUX/IAA family. These results provide a theoretical basis for further studies on the auxin regulatory mechanisms in rose.

ORGANISM(S): Rosa hybrid cultivar

PROVIDER: GSE225844 | GEO | 2023/02/28

REPOSITORIES: GEO

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Analysis of the effect of exogenous auxin on the regulatory relationship between miRNA and its target genes in rose using high-throughput sequencing [RNA-seq]

Project description:Rose (Rosa hybrida L.) is a major cut flowers in the world. Studying the molecular mechanism of auxin regulation in growth is of great significance for enhancing the understanding of the growth and development processes of rose and informing accurate exogenous auxin application in rose production. However, the response mechanism of rose to miRNA-mediated auxin signal transduction is unclear. In this study, rose plants were treated with IAA, and 75 known miRNAs and 168 novel miRNAs were identified by small RNA sequencing. Among them, 19 known miRNAs and 42 miRNAs were differentially expressed. Many differential miRNAs demonstrated staged responses to auxin treatment. The targeted relationship between miRNA and key transcription factors regulated by auxin in rose was analyzed, and the target genes in the ARF family and AUX/IAA family were screened. By using quantitative real-time PCR(qRT-PCR) to verify the expression patterns of the miRNA regulating the auxin signal transduction pathway and its target gene, we found that miR156a, miR160a, miR164a, miR167d, miR396b-3p, novel_miR_189, novel_miR_74, novel_miR_8, and novel_miR_207 interacted negatively with the ARF family, and miR390a-3p and novel_miR_101 interacted negatively with the AUX/IAA family. These results provide a theoretical basis for further studies on the auxin regulatory mechanisms in rose.

2024-02-24 | GSE225991 | GEO

Genome-wide analysis of the auxin/indoleacetic acid (Aux/IAA) gene family in allotetraploid rapeseed (Brassica napus L.)

Project description:Background: Auxin/Indoleacetic acid (Aux/IAA) genes participate in the auxin signaling pathway and play key roles in plant growth and development. Although the Aux/IAA gene family has been identified in many plants, within allotetraploid Brassica napus little is known. Results: In this study, a total of 119 Aux/IAA genes were found in the genome of B. napus. They were distributed non-randomly across all 19 chromosomes and other non-anchored random scaffolds, with a symmetric distribution in the A and C subgenomes. Evolutionary and comparative analysis revealed that 111 (94.1%) B. napus Aux/IAA genes were multiplied due to ancestral Brassica genome triplication and recent allotetraploidy from B. rapa and B. oleracea. Phylogenetic analysis indicated seven subgroups containing 29 orthologous gene sets and two Brassica-specific gene sets. Structures of genes and proteins varied across different genes but were conserved among homologous genes in B. napus. Furthermore, analysis of transcriptional profiles revealed that the expression patterns of Aux/IAA genes in B. napus were tissue dependent. Auxin-responsive elements tend to be distributed in the proximal region of promoters, and are significantly associated with early exogenous auxin up-regulation. Conclusions: The Aux/IAA gene family were identified and analyzed comprehensively in the allotetraploid B. napus genome. This analysis provides a deeper understanding of diversification of Aux/IAA gene family and will facilitate further dissection of Aux/IAA gene function in B. napus.

2017-10-23 | GSE105889 | GEO

Degron flexibility enforces auxin sensing

Project description:Cullin RING-type E3 ubiquitin ligase SCFTIR1/AFB1-5 and their ubiquitylation targets, AUX/IAAs, sense auxin concentrations in the nucleus. TIR1 binds a surface- exposed degron in AUX/IAAs promoting their ubiquitylation and rapid auxin-regulated proteasomal degradation. Here, we resolved TIR1·auxin·IAA7 and TIR1·auxin·IAA12 complex topology, and show that flexible intrinsically disordered regions (IDRs) cooperatively position AUX/IAAs on TIR1. The AUX/IAA PB1 interaction domain also assists in non-native contacts, affecting AUX/IAA dynamic interaction states. Our results establish a role for IDRs in modulating auxin receptor assemblies. By securing AUX/IAAs on two opposite surfaces of TIR1, IDR diversity supports locally tailored positioning for targeted ubiquitylation, and might provide conformational flexibility for adopting a multiplicity of functional states. We postulate IDRs in distinct members of the AUX/IAA family to be an adaptive signature for protein interaction and initiation region for proteasome recruitment.

2020-05-27 | PXD015392 | Pride

Variation in auxin sensing guides AUX/IAA repressor ubiquitylation and destruction

Project description:Auxin is a drug-like small molecule and morphogen that triggers the formation of SCFTIR1/AFB-AUX/IAA co-receptor complexes leading to ubiquitylation and proteasome-dependent degradation of AUX/IAA transcriptional repressors in plants. Here, we systematically dissect auxin sensing by SCFTIR1-IAA6 and SCFTIR1-IAA19 co-receptor complexes, and assess IAA6/IAA19 ubiquitylation in vitro and IAA6/IAA19 degradation in vivo. TIR1-IAA19 and TIR1-IAA6 interactions form co-receptors with different affinities, which specify ubiquitylation and turnover rate of the AUX/IAA. We demonstrate lysine ubiquitylation in IAA6/IAA19 and propose this ubiquitylation signature to be a consequence of auxin-mediated SCFTIR1-AUX/IAA interactions. We present evidence for an evolving AUX/IAA repertoire, typified by the IAA6/IAA19 ohnologs, that contributes differentially to auxin sensing. We postulate that AUX/IAAs have emerged as a versatility toolbox for auxin-modulated transcriptional control, as the gamut of AUX/IAA destruction kinetics enables fine-tuning of transcriptional auxin response and contributes to the complexity of hormone signaling.

2017-06-14 | PXD004027 | Pride

Transcriptome analysis of ARF and Aux/IAA expression during the induction of somatic embryogenesis in Coffea canephora

Project description:Somatic embryogenesis (SE) is a useful biotechnological tool to study the morpho-physiological, biochemical and molecular processes during the development of Coffea canephora. Plant growth regulators (PGR) play a key role during cell differentiation in SE. The Auxin-response-factor (ARF) and Auxin/Indole-3-acetic acid (Aux/IAA) are fundamental components involved in the signaling of the IAA. The IAA signaling pathway activates or represses the expression of genes responsive to auxins during the embryogenic transition of the somatic cells. The growing development of new generation sequencing technologies (NGS), as well as bioinformatics tools, has allowed us to broaden the landscape of SE study of various plant species and identify the genes directly involved. Analysis of transcriptome expression profiles of the C. canephora genome and the identification of a particular set of differentially expressed genes (DEG) during SE are described in this study. A total of eight ARF and seven Aux/IAA differentially expressed genes were identified during the different stages of the SE induction process. The quantitative expression analysis showed that ARF18 and ARF5 genes are highly expressed after 21 days of the SE induction, while Aux/IAA7 and Aux/IAA12 genes are repressed. The results of this study allow to have a better understanding of the genes involved in auxin signaling pathway as well as their expression profiles during the SE process.

2019-04-03 | GSE128888 | GEO

ETTIN regulates genes involved in cell wall modification

Project description:ETTIN (ETT) encodes a member of the Auxin Response Factor (ARF) family of transcription factors. The gynoecia of strong ett mutants show a partial breakdown in abaxial-adaxial (internal -external) polarity, and a shift in tissue boundaries along the apico-basal axis of the gynoecium. This latter effect increases the size of the stigma, style and stipe in ett mutants at the expense of ovary tissue. Among the putative direct targets of ETT, we found several genes encoding either pectin methylesterases (PMEs) or their inhibitors. PMEs may function to increase the extensibility of the cell wall and thus contribute directly to cellular growth. The identification of genes encoding PMEs and related molecules as direct targets of ETT therefore suggests this factor to be situated near the end of a hierarchy of genetic regulation acting on growth through cell wall modification. Other putative direct targets of ETT encode two members of the Aux/IAA protein family, which have been found to negatively regulate ARFs as an inverse function of auxin concentration. ETT lacks the protein domains, present in most ARFs, that are necessary for negative regulation by Aux/IAA proteins and its own activity should not therefore be subject to regulation by auxin concentration. However, the regulation of two Aux/IAA proteins by ETT may represent an input of this protein into an auxin-regulated network involving other ARFs.

2021-03-05 | GSE14660 | GEO

Grigolon2018 - Responses to auxin signals

Project description:Plants depend on the signalling of the phytohormone auxin for their development and for responding to environmental perturbations. The associated biomolecular signalling network involves a negative feedback on Aux/IAA proteins which mediate the influence of auxin (the signal) on the auxin response factor (ARF) transcription factors (the drivers of the response). To probe the role of this feedback, we consider alternative in silico signalling networks implementing different operating principles. By a comparative analysis, we find that the presence of a negative feedback allows the system to have a far larger sensitivity in its dynamical response to auxin and that this sensitivity does not prevent the system from being highly resilient. Given this insight, we build a new biomolecular signalling model for quantitatively describing such Aux/IAA and ARF responses.

2022-05-10 | MODEL2003060002 | BioModels

Grigolon2018-Responses to auxin signals

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Root nitrate response of Ws plants and afb3-1 mutant plants

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2012-05-01 | GSE35544 | GEO

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