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Transcriptomes of 35S:MYB106VP16 and wild-type Arabidopsis seedling

ABSTRACT: Antirrhinum R2R3 MYB transcription factor MIXTA is known to regulate epidermal cell outgrowth in petal. Arabidopsis has three MIXTA-like proteins NOECK(NOK)/MYB106, MYB16 and MYB17 and nok mutant exhibits over-branched trichomes in rosette leaves. On the other hand, Arabidopsis AP2/ERF transcription factor WAX INDUCER1/SHINE1 is well known to induce cuticle development. Here, we report the transcriptional cascade of MYBs-WIN/SHNs coordinately regulates the epidermal cuticle development. The constitutive expression of MYB106 chimeric repressor, in which strong repression domain was fused with MYB106 (35S:MYB106SRDX), induced cuticle deficiency characterized by organ adhesion, reduction of epicuticular wax crystals and staining by toluidine blue in broad region of aerial parts in addition to the over-branched trichomes. Most these phenotypes were partially reproduced in T-DNA knockout plants and also similarly induced by the chimeric repressors of WIN1/SHINE1(SHN1), SHN2 and SHN3, which are AP2/ERF transcription factors previously shown as positive regulators of cutin. Microarray experiments revealed that MYB106SRDX and WIN1SRDX plants have similar transcriptomes, in which the expression of wax and cutin biosynthetic genes was suppressed. Conversely, VP16-fused MYB106 which has high activation ability induced ectopic production of cutin nanoridges in the transgenic plants and enhanced the reporter driven by promoters of WIN1 and wax-related genes in transient expression assay. These results suggest that MIXTA-like proteins regulate cutin biosynthesis partially via WIN1 and directly regulate wax accumulation as well as their known roles in epidermal cell differentiation.

ORGANISM(S): Arabidopsis thaliana

PROVIDER: GSE31886 | GEO | 2013/09/23

SECONDARY ACCESSION(S): PRJNA155081

REPOSITORIES: GEO

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Project description:Purpose: Plant trichomes are hair-like protuberances developing from epidermal cells of most terrestrial plants, serve as an excellent system for analyzing the molecular mechanisms underlying cell fate choices, cell cycle control, and cell morphogenesis. Regulation of trichomes in arabidopsis has been well characterized. However, the mechanisms of multicellular trichomes is unclear. To further identify the genes responsible for the SlCycB2-mediated phenotype change, we compared the gene expression profiles of SlCycB2-OE and RNAi plants by RNA-seq. Methods: The transcriptomes of between SlCycB2-OE and RNAi in tomato (Solanum lycopersicum) cultivar Ailsa Craig (AC) by RNA-seq analysis were evaluated using the Illumina HiSeq™ 2500 sequencing platform. Raw sequences were filtered and the resulting sets of clean reads were used for the following analysis by Hisat2 and DEGseq software. qRT-PCR validation was performed using SYBR Green assays. Results: In this study, we determined that SlCycB2 encodes a nuclear localized protein, which is highly expressed in trichomes, stigmas, hypocotyls and stems, and induced by the light, suppressed under the dark. Transgene analysis showed that suppression of SlCycB2 could promote type III and type V trichomes formation. On the contrary, overexpression of SlCycB2 could result in nearly disappearance of all non-glandular trichomes (including type III and V), as well as the glandular ones of type I and type VI. Detection of secondary metabolites indicated that the production of monoterpene and sesquiterpene were significantly decreased in SlCycB2-OE plants, which thus caused the reduction of the defense against Prodenia litura. Transcriptome profile demonstrated that the differential expressed genes mainly participate in the biosynthesis of terpenes, cutin, suberine and wax. Furthermore, we identified several homologs of this gene in many plants, SlCycB3 in tomato, NtCycB2 in tobacco, AtCycB2 in Arabidopsis, which have similar regulatory functions in trichome formation. SlCycB2 overexpression also led to abnormal flower with the unclosed stamen, shortened style and aberrant pollen. Conclusions: The results demonstrate that SlCycB2 play a critical role in multicellular trichome formation, secondary metabolite biosynthesis, Prodenia litura defense and reproductive organ development in tomato. The similar roles of its homologs in multicellular trichome formation suggest that Solanaceous species may share common regulatory pathway.

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Transcriptomes of 35S:MYB106VP16 and wild-type Arabidopsis seedling

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