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Sorghum SbGhd7 is a major regulator of floral transition and directly represses genes crucial for flowering activation

ABSTRACT: Sorghum SbGhd7 is a major regulator of floral transition and directly represses genes crucial for flowering activation

PROVIDER: PRJNA997961 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR25405028_1.fastq.gz	Fastqsanger.gz
	SRR25405028_2.fastq.gz	Fastqsanger.gz
	SRR25405029_1.fastq.gz	Fastqsanger.gz
	SRR25405029_2.fastq.gz	Fastqsanger.gz
	SRR25405030_1.fastq.gz	Fastqsanger.gz

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Sorghum SbGhd7 is a major regulator of floral transition and directly represses genes crucial for flowering activation

Project description:Sorghum SbGhd7 is a major regulator of floral transition and directly represses genes crucial for flowering activation

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Sorghum SbGhd7 is a major regulator of floral transition and directly represses genes crucial for flowering activation

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Sorghum SbGhd7 is a major regulator of floral transition and directly represses genes crucial for flowering activation

Project description:Sorghum is multipurpose crop worldwide serving as food, feed, and feedstock for biofuels, whose floral transition and vegetative growth heavily depend on photoperiod. Although multiple sorghum maturity loci (Ma1-Ma6) have been associated with photoperiod sensitivity in previous QTL studies, the underlying molecular mechanisms remain poorly understood. By functional characterizing sorghum SbGhd7 (Ma6) and integrating RNA-seq analysis of Ghd7 overexpression sorghum, ChIP-seq analysis of SbGhd7 binding sites in protoplasts and molecular studies, we discovered that SbEhd1 and SbFT10 are the direct targets of SbGhd7. SbGhd7 is a transcriptional repressor and inhibits florigen-induced floral transition by repressing SbEhd1 and SbFT10 expression.

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Sorghum SbGhd7 is a major regulator of floral transition and directly represses genes crucial for flowering activation

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Project description:Several pathways conferring environmental flowering responses in Arabidopsis converge on developmental processes that mediate floral transition in the shoot apical meristem. Many characterized mutations disrupt these environmental responses, but downstream developmental processes have been more refractory to mutagenesis. We constructed a quintuple mutant impaired in several environmental pathways and showed that it possesses severely reduced flowering responses to changes in photoperiod and ambient temperature. RNA-seq analysis of the quintuple mutant showed that the expression of genes encoding gibberellin biosynthesis enzymes and transcription factors involved in the age pathway correlates with flowering. Mutagenesis of the quintuple mutant generated two late-flowering mutants, quintuple ems 1 (qem1) and qem2. The mutated genes were identified by isogenic mapping and transgenic complementation. The qem1 mutant was an allele of ga20ox2, confirming the importance of gibberellin for flowering in the absence of environmental responses. By contrast, the qem2 mutation is in CHROMATIN REMODELING 4 (CHR4), which has not been genetically implicated in floral induction. Using co-immunoprecipitation, RNA-seq and ChIP-seq, we show that CHR4 interacts with transcription factors involved in floral meristem identity and affects expression of key floral regulators. We conclude that CHR4 mediates the response to endogenous flowering pathways in the inflorescence meristem to promote floral identity.

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SIN3 LIKE genes mediate long-day induction of flowering but inhibit the floral transition in short days through histone deacetylation in Arabidopsis

Project description:We show that in Arabidopsis SIN3 LIKE (SNL)family genes encoding a scoffold protein for assembly of histone deacetylase complex, directly regulate the expression of an FT activator and three FT repressors to regulate the transition to flowering in short days and long days, respectively. Under inductive long days, SNLs including SIN3 LIKE 1(SNL1) to SNL5, function in partial redundancy to repress the expression of three AP2 family transcription factors that repress FT expression, and thus mediate long-day induction of FT expression and promote the transitiion to flowering. In contrast, under non-inductive short days SNLs act to inhibit the floral transition, partly through direct repression of a MADS box transcriptional factor that promotes FT expression. Thus, our results reveal that SNLs, through histone deacetylation, play a novel dual role for the control of flowering in the long-day plant Arabidopsis: inhibiting flowering when the day length is shorter and promoting the floral transition when days become longer than a threshold length.

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Sorghum SbGhd7 is a major regulator of floral transition and directly represses genes crucial for flowering activation

Project description:This SuperSeries is composed of the SubSeries listed below.

2024-01-30 | GSE238095 | GEO

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Project description:Water deficit is the key induction factors known to induce flowering in many woody plants, whereas reports on the molecular mechanisms underlying floral induction by water deficit are scarce. Here, we analyzed morphology, cytology and different hormone level of lemon buds during floral inductive water deficits. Higher levels of ABA were observed and the floral buds initiated differentiation by paraffin sections analysis. Total 1,638 differentially expressed genes (DEGs) were identified by RNA-sequencing. Some DEGs were related to flowering, while others were associated with hormone biosynthesis or metabolism.

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