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ABSTRACT: maize tassel architecture development

PROVIDER: PRJNA985462 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR24967126_1.fastq.gz	Fastqsanger.gz
	SRR24967126_2.fastq.gz	Fastqsanger.gz
	SRR24967127_1.fastq.gz	Fastqsanger.gz
	SRR24967127_2.fastq.gz	Fastqsanger.gz
	SRR24967128_1.fastq.gz	Fastqsanger.gz

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Progressive meristem and single-cell transcriptomes reveal the regulatory mechanisms underlying maize inflorescence development and sex differentiation

Project description:Maize develops separate ear and tassel inflorescences with initially similar morphology but finally different architecture and sexuality. The detailed regulatory mechanisms underlying these changes still remain largely clear. In this study, through analyzing the time-course meristem transcriptomes and floret single-cell transcriptomes of ear and tassel we revealed the regulatory dynamics and pathways underlying inflorescence development and sex differentiation. Our study provides a deep understanding of the regulatory mechanisms underlying inflorescence development and sex differentiation in maize, laying the foundation to identify new regulators and pathways for maize hybrid breeding and improvement.

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Project description:Overexpressing SPL23 and SPL25 affect maize tassel architecture development

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Boron homeostasis functions in meristem maintenance in maize by regulating knotted1, cell cycle, and hormone signaling pathways

Project description:Here we report, that levels of the micronutrient boron are instrumental for meristem maintenance by integration into specific meristem maintenance pathways. We used RNA-seq analysis of the boron deficient maize mutant tassel-less1 to identify early molecular defects induced by boron deficiency in maize reproductive (tassel) meristems. RNA-seq results were independently verified through downstream in silico, double mutant, microscopy, proteomic, and molecular analyses.

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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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An integrated analysis of protein abundance, transcript level and tissue diversity to reveal developmental regulation of maize

Project description:The differentiation and subsequent development of plant tissues or organs are tightly regulated at multiple levels, including the transcriptional, posttranscriptional, translational, and posttranslational levels. Transcriptomes define many of the tissue-specific gene expression patterns in maize, and some key genes and their regulatory networks have been established at the transcriptional level. In this study, the sequential window acquisition of all theoretical spectra-mass spectrometry technique was employed as a quantitative proteome assay of four representative maize tissues, and a set of high confidence proteins were identified. Integrated analysis of the proteome and transcriptome revealed that protein abundance was positively correlated with mRNA level with weak to moderate correlation coefficients, but the abundance of key proteins for function or architecture in a given tissue was closely tempo-spatially regulated at the transcription level. A subset of differentially expressed proteins, specifically tissue-specific proteins, were identified, e.g., reproductive structure and flower development-related proteins in tassel and ear, lipid and fatty acid biosynthetic process-related proteins in immature embryo, and inorganic substance and oxidation reduction responsive proteins in root, potentially revealing the physiology, morphology and function of each tissue. Furthermore, we found many new proteins in specific tissues that were highly correlated with their mRNA levels, in addition to known key factors. These proteome data provide new perspective for understanding many aspects of maize developmental biology.

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