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Arabidopsis thaliana

ABSTRACT: High-thoughput Illumina RNA sequencing to identify downstream target genes of RABBIT EARS (RBE) in the flowers of Arabidopsis thaliana

PROVIDER: PRJNA153493 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR444595.fastq.gz	Fastqsanger.gz
	SRR444596.fastq.gz	Fastqsanger.gz
	SRR444597.fastq.gz	Fastqsanger.gz
	SRR444598.fastq.gz	Fastqsanger.gz
	SRR444599.fastq.gz	Fastqsanger.gz

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High-thoughput Illumina RNA sequencing to identify downstream target genes of RABBIT EARS (RBE) in the flowers of Arabidopsis thaliana

Project description:In order to identify putative downstream target genes of RBE, we sequenced mRNA from dexamethasone (DEX) and mock treated transgenic Arabidopsis line 35S:GR-RBE (RBE coding region fused to a glucocorticoid receptor domain driven by the constitutive 35S promoter) floral tissues. We compared the results from DEX and mock treatments and focused on the 832 genes whose expression was significantly reduced (P < 0.025) by 2-fold or more in DEX as compared to mock-treated plants. In this analysis, we identified MIR164c (EEP1) as a candidate target of RBE, which was further confirmed by other molecular and genetic analyses. Regulation of MIR164c by RBE is important for normal floral organ formation in Arabidopsis.

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High-thoughput Illumina RNA sequencing to identify downstream target genes of RABBIT EARS (RBE) in the flowers of Arabidopsis thaliana

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Project description:The debate on the origin and evolution of flowers has recently entered the field of developmental genetics, with focus on the design of the ancestral floral regulatory program. Flowers can differ dramatically among angiosperm lineages, but in general, sterile perianth organs surrounding stamens (male reproductive organs) and carpels (female reproductive organs) constitute the basic floral structure. However, the basal angiosperm lineages exhibit spectacular diversity in the number, arrangement, and structure, of floral organs, while the evolutionarily derived monocot and eudicot lineages share a far more uniform floral ground plan. As such, regulatory mechanisms underlying the archetypal floral plan, for instance that of the eudicot genetic model Arabidopsis thaliana, are unlikely to apply to the original flowers. Here we show that broadly overlapping transcriptional programs characterise the floral transcriptome of the basal angiosperm Persea americana (avocado), while floral gene expression domains are typically organ-specific in Arabidopsis. Our findings extend the “fading borders” model for basal angiosperms from organ identity genes to the downstream floral transcriptome, and suggest that the combinatorial mechanism for organ identity may not operate in basal angiosperms as it does in Arabidopsis. Furthermore, fading expression of components of the stamen transcriptome in central and peripheral regions of Persea flowers resembles the developmental program of the hypothesized gymnosperm “floral progenitor”. Accordingly, in contrast to the canalized organ-specific regulatory apparatus of Arabidopsis, floral development may have been originally regulated by overlapping transcriptional cascades with fading gradients of influence from focal to bordering organs.

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Detection of genes acting downsteram of ectopically expressed TCP/CYC2 transcription factors in Arabidopsis thaliana

Project description:TCP transcription factors from the CYC2-class are involved in the development of monosymmetric flowers in all core eudicot species analysed so far. In Antirrhinum majus, the CYC2/TCP transcription factor CYCLOIDEA (CYC) is the molecular key regulator driving the development of flower monosymmetry (Luo D, Carpenter R, Vincent C, Copsey L, Coen E: Origin of floral asymmetry in Antirrhinum. Nature 1996, 383:794-799). In the Brassicaceae Iberis amara, a stronger expression of the CYC2 gene IaTCP1 in the small adaxial petals likely leads to the reduced petal size in comparison to large abaxial petals, with hardly any IaTCP1 expression. This results in the formation of the monosymmetric Iberis flower (Busch A, Zachgo S: Control of corolla monosymmetry in the Brassicaceae Iberis amara. PNAS 2007, 104:16714-16719). In contrast, the orthologous TCP/CYC2 transcription factor TCP1 from Arabidopsis thaliana, which forms equally sized and shaped petal pairs, only shows an early and transient expression in the adaxial area of floral primordia. This implies that monosymmetry in the Brassicaceae evolved through a heterochronic expression shift of the TCP/CYC2 key regulator gene IaTCP1. Transgenic Arabidopsis plants overexpressing IaTCP1 and TCP1 develop smaller petals whereas transgenic plants overexpressing CYC from Antirrhinum majus produce larger flowers. In any case, petal size is affected. To compare the effects of the three CYC2 TCP transcription factors on downstream (regulatory) networks in Arabidopsis thaliana, a microarray analysis was conducted.

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