Ontology highlight
ABSTRACT:
PROVIDER: PRJNA849024 | ENA |
REPOSITORIES: ENA
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Project description:Ovule formation is essential for realizing crop yield as it determines seed number. The underlying molecular mechanism, however, remains elusive. Here, we show that cell wall invertase (CWIN) functions as a positive regulator of ovule initiation in Arabidopsis. In situ hybridization revealed that CWIN2 and CWIN4 were expressed at the placenta region where ovule primordia initiated. Specific silencing of CWIN2 and 4 by using targeted artificial microRNA driven by an ovule-specific SEEDSTICK promoter (pSTK) resulted in a significant reduction of CWIN transcript and activity, which blocked ovule initiation and aggravated ovule abortion. Surprisingly, there was no induction of carbon starvation genes in the transgenic lines and supplement of extra carbon to newly forming floral buds failed to recover the ovule phenotype. The findings indicate that suppression of CWIN did not lead to carbon starvation. Interestingly, a group of hexose transporters was downregulated in the transgenic plants and two representative transporter genes, STP9 and SWEET8 were spatially co-expressed with CWIN2 and CWIN4, suggesting a coupling between CWIN and hexose transporters for ovule initiation. RNA-Seq analysis identified differentially expressed genes encoding putative extracellular receptor-like-kinases (RLKs), MADS-box transcription factors including STK and early auxin response genes, SAURs, in response to CWIN-silencing. Collectively, our data demonstrate the essential role that CWIN plays in ovule initiation likely through sugar signalling instead of carbon nutrient contribution. We propose that CWIN-mediated sugar signalling may be perceived by, and transmitted through, hexose transporters or RLKs to regulate ovule formation by modulating downstream auxin signalling and MADS-box transcription factors.
2020-02-29 | GSE139917 | GEO
Project description:This series contain all stages Arabidopsis plant development. Stages of development includes unfertilized ovule, 24-Hr post-fertilization seed, globular stage seed, cotyledon stage seed, mature green seed, post-mature green seed, post-germination seedling, rosette leaf, root, stem, and floral bud. Keywords = Arabidopsis Keywords = Seed development Keywords = seedling Keywords = germination Keywords = leaf Keywords = root Keywords = stem Keywords = floral bud Keywords: ordered
2005-01-01 | GSE680 | GEO
Project description:Ovule development is a key process for plant reproduction that ensures correct seed production. Understanding the molecular mechanisms that control ovule formation will also provide new approaches to increase crop yield for breeding. Several molecular factors and plant hormones, including gibberellins, are involved in ovule initiation and development. Gibberellins control ovule development by the destabilization of DELLA proteins, whereas DELLA activity has been proved to act as a positive factor for ovule primordia emergence. But the molecular mechanism by which DELLA act remained unknown. Here we have proved that DELLA proteins control ovule initiation by the formation of a protein complex with the CUC2 transcription factor. The DELLA protein GAI requires CUC2 to promote ovule primordia formation, thus GAI would function by its direct protein-protein interaction with CUC2 in cells of the placenta that determine the boundary regions between ovules during pistil development. Analysis of GAI-CUC2 interaction and colocalization in placenta support this hypothesis. Moreover, molecular analysis of the loci at which GAI protein may act as transcriptional co-regulators in a CUC2-dependent manner identified a subset of target genes that would be regulated by the GAI-CUC2 complex and contribute to regulate ovule primordia emergence.
2021-12-23 | GSE178414 | GEO
Project description:Hypericum perforatum L. (2n=4x=32) is an attractive model system for the study of aposporous apomixis. The earliest phenotypic features of aposporous apomixis in this species are the mitotic formation of unreduced embryo sacs from a somatic cell of the ovule nucellus and the avoidance of meiosis. In this research we addressed gene expression variation in sexual and apomictic plants, by focusing on the ovule nucellus, which is the cellular domain primarily involved into the differentiation of meiocyte precursors and aposporous embryo sacs. Gene expression analysis performed by RNAseq identified 396 differentially expressed genes and 1834 transcripts displaying phenotype-specific expression. Overall, our data suggest that phenotypic expression of aposporous apomixis is concomitant with the modulation of key genes involved in cell patterning, RNA splicing and RNA-directed DNA methylation.
2019-03-28 | GSE128923 | GEO
Project description:This experiment was designed to identify genes expressed preferentially in the two integuments of the Arabidopsis ovule. Pistils from wild type and two ovule mutants were compared against each aintegumenta-4 (ant-4) which lacks both integuments and inner no outer (ino-1) which lacks the outer integument. Genes that are highly expressed only in the integuments were expected to be reduced in expression in the mutants, as compared with wild type. Pistils containing ovules through all stages of ovule development prior to pollination were pooled for one experiment (FULL arrays), and for two separate experiments, a set of early differentiation stages (EARLY arrays) and a set of later differentiation stages (LATE ARRAYS) were pooled. Wild type and mutant lines are in the ecotype Landsberg erecta.
2009-06-01 | E-MEXP-1920 | biostudies-arrayexpress
Project description:We are interested in examining the transcriptional hierarchies that are required for proper formation and function of the carpel margin meristem in Arabidopsis thaliana. The carpel margin meristem (CMM) gives rise to the ovule primorida (which begin to form around flower stage 8). We know that the loss of the seuss-3 (seu-3) and aintegumenta-1(ant-1) separately leads to a mild disruption of ovule formation, while the loss of both causes a complete loss of ovule formation. In this study we wanted to examine expression levels changed between each single mutant and the double mutant. We dissected out stage 8-10 carpel of each of the four genotypes (seu-3, ant-1, Col-0, seu-3 ant-1) pooling 15-25 carpels into one biological replicate. Then using 16 ATH1 arrays we hybridized, amplified and labeled cDNA to 16 arrays (4 replicates for each genotype). We then analyzed our data to reveal transcripts that went down in the double compared to either single mutant, and transcripts that went down more than additively in the double mutant compared to added level of the decrease of the single mutant levels.
2011-08-01 | GSE30492 | GEO
Project description:Flowers have a species-specific fertile period during which pollination and fertilization have to occur to initiate seed and fruit development. Within the flower, the functional life span of the ovule containing the female gametophyte is decisive for fertilization and the initiation of seed development. Here we performed an RNA-sequencing based transcriptome analysis of senescing unfertilized ovules during in a time series. We isolated ovules from Arabidopsis thaliana flowers emasculated at stage 12c at three different time points: 2 days after emasculation (DAE), 3 DAE, and 4 DAE. These time points correspond to intact mature ovules (2DAE), early ovule senescence (3 DAE), and late ovule senescence (4 DAE). We extracted total RNA from the ovules in 3 independent biological replicates, thus generating 9 RNA samples in total, for RNA-sequencing by Illumina HiSeq.
2023-05-30 | E-MTAB-12174 | biostudies-arrayexpress
Project description:This series contain all stages Arabidopsis plant development. Stages of development includes unfertilized ovule, 24-Hr post-fertilization seed, globular stage seed, cotyledon stage seed, mature green seed, post-mature green seed, post-germination seedling, rosette leaf, root, stem, and floral bud.
2008-06-15 | E-GEOD-680 | biostudies-arrayexpress
Project description:The function of the plant hormone jasmonic acid (JA) in development of tomato flowers was analyzed with a mutant defective in JA perception (jasmonate-insensitive1-1, jai1-1). In contrast to Arabidopsis JA-insensitive plants that are male sterile, the tomato mutant jai1-1 exhibits major defects in female development resulting in female sterility. To identify putative JA-dependent regulatory components, transcriptomics was performed using isolated ovules of three different stages of flower development, from both wild type and jai1-1. Among the strongly down-regulated genes in jai1-1, one encoding a MYB transcription factor (SlMYB21) was found. Its orthologue in Arabidopsis has a crucial role in JA-regulated stamen development. SlMYB21 showed transcription factor activity in yeast, interaction with SlJAZ9 in yeast and in planta, and complemented the Arabidopsis mutant myb21-5. To analyze SlMYB21 function in tomato ovule development, CRISPR/Cas9 mutants were created and a TILLING mutant was identified, all showing female sterility and therefore corroborating a function of MYB21 in tomato ovule development. Transcriptomics from wild type, jai1-1 and myb21-2 carpels revealed processes that might be controlled by SlMYB21. The data suggest a positive regulation of JA biosynthesis by SlMYB21, but a negative regulation of the action of auxin and GA. The results demonstrate that SlMYB21 mediates at least partially the action of JA and might control the flower to fruit transition.
2019-11-05 | E-MTAB-7545 | biostudies-arrayexpress
Project description:The function of the plant hormone jasmonic acid (JA) in development of tomato flowers was analyzed with a mutant defective in JA perception (jasmonate-insensitive1-1, jai1-1). In contrast to Arabidopsis JA-insensitive plants that are male sterile, the tomato mutant jai1-1 exhibits major defects in female development resulting in female sterility. To identify putative JA-dependent regulatory components, transcriptomics was performed using isolated ovules of three different stages of flower development, from both wild type and jai1-1. Among the strongly down-regulated genes in jai1-1, one encoding a MYB transcription factor (SlMYB21) was found. Its orthologue in Arabidopsis has a crucial role in JA-regulated stamen development. SlMYB21 showed transcription factor activity in yeast, interaction with SlJAZ9 in yeast and in planta, and complemented the Arabidopsis mutant myb21-5. To analyze SlMYB21 function in tomato ovule development, CRISPR/Cas9 mutants were created and a TILLING mutant was identified, all showing female sterility and therefore corroborating a function of MYB21 in tomato ovule development. Transcriptomics from wild type, jai1-1 and myb21-2 carpels revealed processes that might be controlled by SlMYB21. The data suggest a positive regulation of JA biosynthesis by SlMYB21, but a negative regulation of the action of auxin and GA. The results demonstrate that SlMYB21 mediates at least partially the action of JA and might control the flower to fruit transition.
2019-10-15 | E-MTAB-7544 | biostudies-arrayexpress