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Regulation of ARGONAUTE10 Expression Enables Temporal and Spatial Precision in Axillary Meristem Initiation in Arabidopsis.

ABSTRACT: Axillary meristems (AMs) give rise to lateral shoots and are critical to plant architecture. Understanding how developmental cues and environmental signals impact AM development will enable the improvement of plant architecture in agriculture. Here, we show that ARGONAUTE10 (AGO10), which sequesters miR165/166, promotes AM development through the miR165/166 target gene REVOLUTA. We reveal that AGO10 expression is precisely controlled temporally and spatially by auxin, brassinosteroids, and light to result in AM initiation only in the axils of leaves at a certain age. AUXIN RESPONSE FACTOR 5 (ARF5) activates while BRASSINAZOLE-RESISTANT 1 (BZR1) and PHYTOCHROME-INTERACTING FACTOR 4 (PIF4) repress AGO10 transcription directly. In axils of young leaves, BZR1 and PIF4 repress AGO10 expression to prevent AM initiation. In axils of older leaves, ARF5 upregulates AGO10 expression to promote AM initiation. Our results uncover the spatiotemporal control of AM development through the cooperation of hormones and light converging on a regulator of microRNA.

SUBMITTER: Zhang C

PROVIDER: S-EPMC7774873 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Project description:Background: The carpel margin meristem is a vital multi-potent structure located in the medial domain of the Arabidopsis thaliana gynoecium, the female floral reproductive organ. The carpel margin meristem generates ovules that upon fertilization become seeds. The molecular mechanisms that specify this meristematic region and regulate its organogenic potential are poorly understood. Here, we present an analysis of the transcriptional profile of the medial domain of the Arabidopsis gynoecium highlighting the developmental stages that immediately proceed ovule initiation, the earliest stages of seed development. Results: Using a floral synchronization system and a SHATTERPROOF2 domain-specific reporter construct, paired with fluorescence-activated cell sorting, we assayed the transcriptome of the gynoecial medial domain with temporal and spatial precision. Our analysis reveals a set of genes that are differentially-expressed within the SHATTERPROOF2 expression domain that marks portions of the developing medial domain. Many members of this gene set have been shown previously to function during the development of medial domain-derived structures, including the ovules, thus validating our approach. Other uncharacterized members of this gene set, including a set of differentially-expressed cis-natural antisense transcripts, are potential novel regulators of medial domain development and candidates for future functional studies. Several members of the REM family of transcriptional regulators were enriched in the SHP2-expressing cell population including a previously unrecognized REM family member (At5g60142). Analysis of the abundance of specific transcriptional isoforms identified genes that may exhibit âisoform switchingâ behavior during gynoecial development. Conclusions: This data set provides genome-wide transcriptional insight into the development of the gynoecial medial domain that contains the carpel margin meristem, an important reproductive structure that gives rise to the ovules in Arabidopsis thaliana. Four samples (YFP-positive, YFP-negative, all-sorted, and non-sorted). Four biological replicates of each sample (except YFP-positive, collected in triplicated). Strand-specific libraries were sequenced (single-end) in two lanes of a HiSeq 2500 Illumina flow cell (each lane was later analyzed as a technical replicate).

Project description:Background: The carpel margin meristem is a vital multi-potent structure located in the medial domain of the Arabidopsis thaliana gynoecium, the female floral reproductive organ. The carpel margin meristem generates ovules that upon fertilization become seeds. The molecular mechanisms that specify this meristematic region and regulate its organogenic potential are poorly understood. Here, we present an analysis of the transcriptional profile of the medial domain of the Arabidopsis gynoecium highlighting the developmental stages that immediately proceed ovule initiation, the earliest stages of seed development. Results: Using a floral synchronization system and a SHATTERPROOF2 domain-specific reporter construct, paired with fluorescence-activated cell sorting, we assayed the transcriptome of the gynoecial medial domain with temporal and spatial precision. Our analysis reveals a set of genes that are differentially-expressed within the SHATTERPROOF2 expression domain that marks portions of the developing medial domain. Many members of this gene set have been shown previously to function during the development of medial domain-derived structures, including the ovules, thus validating our approach. Other uncharacterized members of this gene set, including a set of differentially-expressed cis-natural antisense transcripts, are potential novel regulators of medial domain development and candidates for future functional studies. Several members of the REM family of transcriptional regulators were enriched in the SHP2-expressing cell population including a previously unrecognized REM family member (At5g60142). Analysis of the abundance of specific transcriptional isoforms identified genes that may exhibit “isoform switching” behavior during gynoecial development. Conclusions: This data set provides genome-wide transcriptional insight into the development of the gynoecial medial domain that contains the carpel margin meristem, an important reproductive structure that gives rise to the ovules in Arabidopsis thaliana.

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Regulation of ARGONAUTE10 Expression Enables Temporal and Spatial Precision in Axillary Meristem Initiation in Arabidopsis.

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