Ontology highlight
ABSTRACT:
PROVIDER: PRJNA719008 | ENA |
REPOSITORIES: ENA
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Project description:<p>Cold stress negatively affects maize (<em>Zea mays</em> L.) growth, development and yield. Metabolic adjustments contribute to the adaptation of maize under cold stress. We show here that the transcription factor INDUCER OF CBF EXPRESSION 1 (ZmICE1) plays a prominent role in reprogramming amino acid metabolome and <em>COLD-RESPONSIVE</em> (<em>COR</em>) genes during cold stress in maize. Derivatives of amino acids glutamate/asparagine (Glu/Asn) induce a burst of mitochondrial reactive oxygen species, which suppress the cold-mediated induction of <em>DEHYDRATION RESPONSE ELEMENT-BINDING PROTEIN 1</em> (<em>ZmDREB1</em>) genes and impair cold tolerance. ZmICE1 blocks this negative regulation of cold tolerance by directly repressing the expression of the key Glu/Asn biosynthesis genes, <em>ASPARAGINE SYNTHETASEs</em>. Moreover, ZmICE1 directly regulates the expression of <em>DREB1s</em>. Natural variation at the <em>ZmICE1</em> promoter determines the binding affinity of the transcriptional activator ZmMYB39, a positive regulator of cold tolerance in maize, resulting in different degrees of <em>ZmICE1</em> transcription and cold tolerance across inbred lines. This study thus unravels a mechanism of cold tolerance in maize and provides potential targets for engineering cold-tolerant varieties.</p>
2022-10-31 | MTBLS4404 | MetaboLights
Project description:Drought represents a major constraint on maize production worldwide. Understanding the genetic basis for natural variation in drought tolerance of maize may facilitate efforts to improve this trait in cultivated germplasm. Here, using a genome-wide association study, we show that a miniature inverted-repeat transposable element (MITE) inserted in the promoter of a NAC gene (ZmNAC111) is significantly associated with natural variation in maize drought tolerance. For maize RNA-seq analysis, pooled tissues from three, eight-day-old maize seedlings were collected from transgenic and wild-type plants, prior to or after 2-hour dehydration, to conduct the RNA-seq analysis.
2015-03-29 | E-MTAB-4246 | biostudies-arrayexpress
Project description:The target of rapamycin (TOR) kinase is a central signaling hub that plays a crucial role in precisely orchestrating plant growth and development. It is increasingly evident that TOR also has a significant impact on plant stress responses. This suggests that TOR is intricately involved in maintaining the balance between plant growth and stress responses. Nevertheless, despite the observed effects, the specific mechanisms through which TOR operates in these processes remain obscure. In this study, we investigated how the tomato (Solanum lycopersicum) TOR (SlTOR) affects plant growth and cold responses. We demonstrated that the inhibition of SlTOR transcriptionally primes cold stress responses, consequently enhancing tomato cold tolerance. Furthermore, a widely targeted metabolomics analysis revealed the disruption of amino acid metabolism homeostasis under cold stress upon SlTOR inhibition. This disruption led to the accumulation of two important defense metabolites: salicylic acid (SA) and putrescine (Put). Subsequent gain- and loss-of-function analyses validated the crucial roles of salicylic acid and putrescine in enhancing tomato cold tolerance. Our study provides a mechanistic framework that elucidates how SlTOR modulates amino acid-related metabolism to enhance tomato cold tolerance, which sheds light on the complex interplay between growth and stress responses orchestrated by TOR.
2024-12-19 | GSE266850 | GEO
Project description:Opaque2 (O2) is a transcription factor that plays important roles during maize endosperm development. Mutation of the O2 gene improves the nutritional value of maize seeds, but also confers pleiotropic effects that result in reduced agronomic quality. To reveal the transcriptional regulatory framework of O2, we determined O2 DNA binding targets using chromatin immunoprecipitation coupled to high-throughput sequencing (ChIP-Seq). ChIP-Seq analysis detected 1,686 O2 DNA binding sites distributed over 1,143 genes. We identified 4 new O2 binding motifs; among them, TGACGTGG appears to be the most conserved and strongest. We confirmed that, except for the 16 kD and 18 kD zeins, O2 directly regulates expression of all other zeins. O2 directly regulates two transcription factors, genes linked to carbon and amino acid metabolism and abiotic stress resistance. Examination of 15 days after pollination(DAP) wild type maize endosperm with O2 specific antibody and IgG serves as control.
2015-03-06 | E-GEOD-63991 | biostudies-arrayexpress
Project description:High-throughput sequencing of genomic regions isolated using FAIRE (Formaldehyde-assisted isolation of regulatory elements) from two maize lines of contrasting cold-sensitivity, S68911 (tolerant) and B73 (sensitive) grown in cold and control conditions. Three growth stages were examined: coleoptile (VE), seedling with the tip of the second leaf visible (called here “VE/V1 stage”), first leaf fully developed (V1, ligular region present). Results suggest both efficient metabolism and active defense mechanisms as a basis of S68911 maize cold-tolerance.
2020-10-19 | E-MTAB-8401 | biostudies-arrayexpress
Project description:A DIR family protein confers natural variation of Casparian strip and salt tolerance in maize
| PRJNA706836 | ENA
Project description:TOR balances plant growth and cold tolerance by orchestrating amino acid-derived metabolism in tomato
| PRJNA1108424 | ENA