Arabidopsis thaliana
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA207397 | ENA |
REPOSITORIES: ENA
Similar Datasets
Project description:In Arabidopsis seed development involves maternal small interfering RNAs (siRNAs) that induce RNA-directed DNA methylation (RdDM) through the NRPD1 pathway. To investigate their biological functions we characterized siRNAs in the endosperm and seed coat that were separated by laser capture microdissection (LCM) in reciprocal genetic crosses with an nrpd1 mutant. We also monitored the spatio-temporal activity of the NRPD1 pathway on seed development using AGO4:GFP::AGO4 (promoter:GFP::protein) reporter and promoter:GUS sensors of siRNA-mediated silencing. From these approaches we identified four distinct groups of siRNA loci that were dependent on or independent of the maternal NRPD1 allele in the endosperm or seed coat. A group of maternally expressed NRPD1-siRNA loci targets endosperm-preferred genes, including those encoding AGAMOUS-LIKE (AGL) transcription factors. Using the sensor AGL40:GUS and AGL91:GUS constructs we demonstrate that spatial and temporal expression patterns of these genes in the endosperm were regulated by the NRPD1-mediated pathway irrespective of complete silencing (AGL91) or incomplete silencing (AGL40) of these target genes. Modified expression of these siRNA-targeted genes affects seed size and we propose that the corresponding maternal siRNAs could account for parent-of-origin effects on the endosperm in interploidy and hybrid crosses. These analyses reconcile previous studies on siRNAs and imprinted gene expression during seed development.
2018-12-31 | GSE47722 | GEO
Project description:Seed size is related to plant evolution and crop yield and is affected by genetic mutations, imprinting, and genome dosage. Imprinting is a widespread epigenetic phenomenon in mammals and flowering plants. ETHYLENE INSENSITIVE2 (EIN2) encodes a membrane protein that links the ethylene perception to transcriptional regulation. Interestingly, during seed development EIN2 is maternally-expressed in Arabidopsis and maize, but the role of EIN2 in seed development is unknown. Here we show that EIN2 is expressed specifically in the endosperm, and the maternal-specific EIN2 expression affects temporal regulation of endosperm cellularization. As a result, seed size increases in the genetic cross using the ein2 mutant as the maternal parent or in the ein2 mutant. The maternal-specific expression of EIN2 in the endosperm is controlled by DNA methylation but not by H3K27me3 or by ethylene and several ethylene pathway genes tested. RNA-seq analysis in the endosperm isolated by laser-capture microdissection show upregulation of many endosperm-expressed genes such as AGAMOUS-LIKEs (AGLs) in the ein2 mutant or when the maternal EIN2 allele is not expressed. EIN2 does not interact with DNA and may act through ETHYLENE INSENSITIVE3 (EIN3), a DNA binding protein present in sporophytic tissues, to activate target genes like AGLs, which in turn mediate temporal regulation of endosperm cellularization and seed size. These results provide mechanistic insights into endosperm and maternal-specific expression of EIN2 on endosperm cellularization and seed development, which could help improve seed production in plants and crops.
2022-10-12 | GSE147587 | GEO
Project description:This series analyses germinating Arabidopsis seeds with both temporal and spatial detail, revealing two transcriptional phases that are separated with respect to testa rupture. Performed as part of the ERA-NET Plant Genomics grant vSEED. Arabidopsis seeds were dissected into four tissues at nine time-points during seed germination. The tissues were the combined micropylar and chalazal endosperm (MCE), the remaining endosperm (PE), the radicle and embryonic axis (RAD) and the cotyledons (COT). At testa and endosperm rupture the seeds were sampled in separate pre- and post-ruptured populations.
2013-07-16 | E-GEOD-41212 | biostudies-arrayexpress
Project description:Seed size is important to crop domestication and natural selection and is affected by the balance of maternal and paternal genomes in endosperm. Endosperm, like placenta in mammals, provides reserves to the developing embryo. Interploidy crosses disrupt the genome balance in endosperm and alter seed size. Specifically, paternal-excess crosses (2 M-CM-^W 4) delay endosperm cellularization (EC) and produce larger seeds, whereas maternal-excess crosses (4 M-CM-^W 2) promote precocious EC and produce smaller seeds. The mechanisms for responding to the parental genome dosage imbalance and for gene expression changes in endosperm are unknown. In plants, RNA polymerase IV (PolIV or p4) encoded by NRPD1a is required for biogenesis of a major class of 24-nt small interfering RNAs (also known as p4-siRNAs), which are predominately expressed in developing endosperm. Here we show that p4-siRNA accumulation depends on the maternal genome dosage, and maternal p4-siRNAs target transposable elements (TEs) and TE-associated genes (TAGs) in seeds. The p4-siRNAs correlate negatively with expression levels of AGAMOUS-LIKE (AGL) genes in endosperm of interploidy crosses. Moreover, disruption of maternal NRPD1a expression is associated with p4-siRNA reduction and AGL up-regulation in endosperm of reciprocal crosses. This is unique genetic evidence for maternal siRNAs in response to parental genome imbalance and in control of transposons and gene expression during endosperm development. 8 samples: 2x X 2x seed,leaf; 4x X 4x seed,leaf; 2x X 4x seed,leaf; 4x X 2x seed,leaf.
2011-11-11 | E-GEOD-25280 | biostudies-arrayexpress
Project description:The expression levels of Arabidopsis thaliana (Col-0) genes in several developmental stages during the seed-to-seedling transition were measured by using high-density Affymetrix® arrays (Aragene.st1.1). We used a time-series of microarrays to gain temporal resolution and identify relevant genes in the seed-to-seedling transition.
2015-12-18 | GSE65394 | GEO
Project description:Methylation Changes in Arabidopsis seed development
| PRJNA281872 | ENA
Project description:This series analyses germinating Arabidopsis seeds with both temporal and spatial detail, revealing two transcriptional phases that are separated with respect to testa rupture. Performed as part of the ERA-NET Plant Genomics grant vSEED.
2013-07-16 | GSE41212 | GEO
Project description:Seed development, which depends on mother plant genetic background and environmental conditions, is a major component determining seed composition. Seed quality is a main agricultural concern, impacting both food and non-food applications, while also playing a central role in biodiversity conservation and environment protection. Climate change, characterized, among other stresses, by the emergence of extremely high temperatures, constitute a critical global threat to agriculture. Specialized metabolites (SMs) play crucial roles in the interactions of plants and seeds with their environments. Several SMs are known to be protective compounds involved in seed stress responses, thus impacting directly or indirectly their quality. In this study, we performed untargeted metabolomic (LC-MS/MS) and transcriptomic (RNA-Seq) analyses of Arabidopsis thaliana seeds harvested at six developmental stages (Globular, Transition, Torpedo, Bent cotyledon, Mature green and Dry seed), and developed under control and warm temperature conditions. Those data provide an original and valuable resource for future studies on the role of SMs and genes involved in seed warm thermic stress responses and for the study of their regulation and functions during seed development.
| MSV000095846 | MassIVE
Project description:Seed size is important to crop domestication and natural selection and is affected by the balance of maternal and paternal genomes in endosperm. Endosperm, like placenta in mammals, provides reserves to the developing embryo. Interploidy crosses disrupt the genome balance in endosperm and alter seed size. Specifically, paternal-excess crosses (2 × 4) delay endosperm cellularization (EC) and produce larger seeds, whereas maternal-excess crosses (4 × 2) promote precocious EC and produce smaller seeds. The mechanisms for responding to the parental genome dosage imbalance and for gene expression changes in endosperm are unknown. In plants, RNA polymerase IV (PolIV or p4) encoded by NRPD1a is required for biogenesis of a major class of 24-nt small interfering RNAs (also known as p4-siRNAs), which are predominately expressed in developing endosperm. Here we show that p4-siRNA accumulation depends on the maternal genome dosage, and maternal p4-siRNAs target transposable elements (TEs) and TE-associated genes (TAGs) in seeds. The p4-siRNAs correlate negatively with expression levels of AGAMOUS-LIKE (AGL) genes in endosperm of interploidy crosses. Moreover, disruption of maternal NRPD1a expression is associated with p4-siRNA reduction and AGL up-regulation in endosperm of reciprocal crosses. This is unique genetic evidence for maternal siRNAs in response to parental genome imbalance and in control of transposons and gene expression during endosperm development.
2011-11-11 | GSE25280 | GEO
Project description:merMEDEA (MEA) is a component of the Polycomb Repressive complex 2 (PRC2) of Arabidopsis thaliana, and a maternal imprinted gene that functions during central cell, embryo and endosperm development. Seeds that develop from mea mutant egg cells abort regardless of the paternal genotype. With this approach, we aim to uncover putative genes that are downstream of MEA and might cause the seed abortion phenotype. For this, we compare three developmental time point datasets between wild-type and mea mutant: ovary (before fertilization), and seed at 1-2 and 4 days after pollination (DAP).
2021-06-25 | E-MTAB-9569 | biostudies-arrayexpress