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ABSTRACT: Maize tassel transcriptome

PROVIDER: PRJNA998913 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR25431413_1.fastq.gz	Fastqsanger.gz
	SRR25431413_2.fastq.gz	Fastqsanger.gz
	SRR25431414_1.fastq.gz	Fastqsanger.gz
	SRR25431414_2.fastq.gz	Fastqsanger.gz
	SRR25431415_1.fastq.gz	Fastqsanger.gz

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The dicerlike1 homologue, fuzzy tassel, is required for the regulation of meristem determinacy in the inflorescence and vegetative growth in maize

Project description:We have characterized a maize mutant, fuzzy tassel (fzt) with striking inflorescence and pleiotropic defects. fzt contains a mutation in the maize dicer-like1 homolog, a key enzyme required for microRNA (miRNA) biogenesis. By profiling the small RNA population in fzt mutants, we investigated the impact of fzt mutation on miRNA abundance in seedling and tassel primordia. We also investigated the transcript abundance of potential target genes of miRNA that were impacted in fzt mutant by transcriptome profiling. The result provides an avenue for future research to link specific miRNAs and their targets to discrete phenotypes and developmental roles.

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The dicerlike1 homologue, fuzzy tassel, is required for the regulation of meristem determinacy in the inflorescence and vegetative growth in maize

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Project description:As a key member of the grass-specific subclade of argonaute proteins, AGO18b protein has been proposed to bind 24-nt meiotic phasiRNAs based on their co-expression in tapetal and meiotic cells. Here we show that expression of in maize tassels is strictly induced by developmental stages. Interestingly, reduced expression of AGO18b in both Mutator-mediated (ago18b::mum) and RNAi mutants leads to an increase in plant height and tassel length, suggesting its non-meiotic function as a negative regulator of SAM/IM maintenance. During the premiotic stage, AGO18b primarily binds to 21-nt phasiRNAs with 5’-uridine and less binds to 24-nt phasiRNAs with 5’-adenosine, coincident with its enrichment of miR2275 required for the 24-nt phasiRNA production. MiR166a, the negative regulator of SAM, is mostly enriched among AGO18b-bound miRNAs, implicating a novel negative regulator of IM. We suggest that AGO18b regulates maize tassel development via both phasiRNAs and miRNA pathways.

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