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ABSTRACT:
PROVIDER: PRJNA936606 | ENA |
REPOSITORIES: ENA
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Project description:Melatonin plays a potential role in multiple plant developmental processes and stress response. However, there are no reports regarding exogenous melatonin promoting rice seed germination under salinity and nor about the underlying molecular mechanisms at genome-wide. Here, we revealed that exogenous application of melatonin conferred roles in promoting rice seed germination under salinity. The putative molecular mechanisms of exogenous melatonin in promoting rice seed germination under high salinity were further investigated through metabolomic and transcriptomic analyses. The results state clearly that the phytohormone contents were reprogrammed, the activities of SOD, CAT, POD were enhanced, and the total antioxidant capacity was activated under salinity by exogenous melatonin. Additionally, melatonin-pre-treated seeds exhibited higher concentrations of glycosides than non-treated seeds under salinity. Furthermore, exogenous melatonin alleviated the accumulation of fatty acids induced by salinity. Genome-wide transcriptomic profiling identified 7160 transcripts that were differentially expressed in NaCl, MT100 and control. Pathway and GO term enrichment analysis revealed that genes involved in the response to oxidative stress, hormone metabolism, heme building, mitochondrion, tricarboxylic acid transformation were altered after melatonin pre-treatment under salinity. This study provides the first evidence of the protective roles of exogenous melatonin in increasing rice seed germination under salt stress, mainly via activation of antioxidants and modulation of metabolic homeostasis.
2020-01-20 | GSE143922 | GEO
Project description:Prunus mongolica is a relict xerophytic shrub with ecological importance for desert ecosystem stability and vegetation restoration in arid and semi-arid regions. However, the physiological and molecular mechanisms underlying its responses to combined alkali-salt and cadmium stress remain unclear. This study aimed to investigate the regulatory role of exogenous gamma-aminobutyric acid (GABA) in improving stress tolerance in Prunus mongolica under alkali-salt stress, cadmium stress, and their combined stress. Seedlings were subjected to eight treatments, including control, GABA alone, alkali-salt stress, cadmium stress, combined alkali-salt and cadmium stress, and the corresponding GABA-treated stress groups. Germination traits, seedling growth, physiological indices, antioxidant responses, osmotic adjustment, photosynthetic pigments, and transcriptomic profiles were analyzed to evaluate the effects of GABA at multiple biological levels. Alkali-salt, cadmium, and combined alkali-salt and cadmium stress markedly inhibited seed germination and seedling growth, with the combined stress causing the most severe damage. Stress treatments promoted reactive oxygen species accumulation, lipid peroxidation, photosynthetic inhibition, and reductions in water status and root activity. Exogenous GABA alleviated these stress-induced effects by improving germination performance, seedling growth, chlorophyll accumulation, root activity, and relative water content, while reducing oxidative damage. GABA also enhanced osmotic adjustment by increasing proline and soluble sugar contents and strengthened antioxidant defense through the activation of superoxide dismutase, peroxidase, catalase, ascorbate peroxidase, and glutathione reductase. Transcriptome analysis showed that GABA modulated stress-responsive genes associated with MAPK signaling, plant hormone signal transduction, plant-pathogen interaction, peroxisome, glutathione metabolism, photosynthesis, carbon metabolism, and other primary metabolic processes. These results suggest that exogenous GABA enhances stress tolerance in Prunus mongolica by coordinating redox homeostasis, osmotic regulation, stress signaling, photosynthetic recovery, and metabolic reprogramming under single and combined alkali-salt and cadmium stresses.
2026-07-03 | GSE337475 | GEO
Project description:Melatonin is a well-known agent that plays multiple roles in animals. Its possible function in plants is less clear. In the present study, we tested the effect of melatonin (N-acetyl-5-methoxytryptamine) on soybean growth and development. Both spraying of leaves and seed-coating with melatonin significantly promoted soybean growth as judged from leaf size and plant height. This enhancement was also observed in soybean production and their fatty acid content. Melatonin increased pod number, seed number and seed weight. However, the 100-seed weight was not influenced by melatonin application. Melatonin also improved soybean tolerance to salt and drought stresses. Transcriptome analysis revealed that melatonin up-regulated the expression of many genes and alleviated the inhibitory effects of salt stress on gene expressions. Further detailed analysis of the affected pathways documents that melatonin likely achieved its promotional roles in soybean through enhancement of genes involved in cell division, photosynthesis, carbohydrate metabolism, fatty acid biosynthesis and ascorbate metabolism. Our results demonstrate that melatonin has significant potential for improving of soybean growth and seed production. Further study should uncover more about the molecular mechanisms of melatoninM-bM-^@M-^Ys function in soybeans and other crops. Four different treatments were chosen, water, salt, 100M-BM-5M melatonin and salt plus 100M-BM-5M melatonin. The comparison of salt/melatonin-treated sample versus water-treated sample reveals salt or melatonin induced transcriptome changes. The comparison of melatonin plus salt treated sample versus salt-treated sample reveals melatonin induced changes when salt exists.
2014-08-31 | E-GEOD-57960 | biostudies-arrayexpress
Project description:Seed germination is an important process that begins new life in plant. To ensure that seedlings grow under optimal condition after germination, seed germination should be precisely regulated by endogenous and environmental factors. Salinity is the major abiotic stress that often adversely impacts plants by inhibiting seed germination, growth and development. Comparative transcriptome analyses of salt-treated seedlings and seeds revealed that although some of the well-known salt-stress marker genes, including RD29a and DREB2A were not induced under salt, genes that can be categorized in similar GO terms involving with stress responsiveness are changed both in seeds and seedlings in response to salt treatment.
2025-11-30 | GSE282389 | GEO
Project description:We established a regulatory network for melatonin-induced key signaling pathways and functional genes under salt stress.
2022-08-03 | GSE199945 | GEO
Project description:Salt stress is a critical factor of abiotic stress in agricultural production that significantly affects seed germination and early seedling development. In this study, we characterized the function of the Arabidopsis Long Hypocotyl 2(HY2) gene in NaCl signaling. The hy2 mutant was NaCl-insensitive, whereas HY2-overexpressing lines shows NaCl-hypersensitive phenotypes during seed germination. Induced by exogenous NaCl, the transcription and the protein level of HY2 were up regulated, and HY2 positively mediated the expression of downstream stress-related genes of RD29A, RD29B and DREB2A. With further quantitative proteomics, we got the patterns of 7,391 proteins under salt stress, and identified 215 differentially regulated proteins (DRPs) specifically regulated by HY2. According to GO enrichment analysis, these proteins are mainly involved in ion homeostasis, hormone response, reactive oxygen species(ROS) metabolic, photosynthesis and detoxification pathway to response salt stress . These results direct the pathway of HY2 participating salt stress, and provide new insights for the plant to resist salt stress.
2022-02-17 | PXD027204 | Pride
Project description:Salinity is a major abiotic stress at critical stages of seed germination and seedling establishment. Germination rate (GR) and field emergence rate (FER) are the key traits that determine the basic number of plants stand under field conditions. To explore molecular mechanisms in upland cotton under salt stress, a population of 177 recombinant inbred lines (RILs) and their parents were evaluated for seed germination traits (GP, germination potential; GR; FW, fresh weight; DW, dry weight; GL, germinal length) and seedling traits (FER; SH, seedling height; NL, Number of main stem leaves) in 2016-2018. Based on the linkage map contained 2,859 single nucleotide polymorphism (SNP) and simple sequence repeats (SSR) markers, traits under salt stress (E1) and normal condition, (E2) and the converted relative index (R-value) of three years’ trials were used to map quantitative trait loci (QTL). A total of three QTL and two clusters were detected as salt-tolerant QTL. Three QTL (qGR-Chr4-3, qFER-Chr12-3, qFER-Chr15-1) were detected under salt stress and R-value, which explained phenotypic variance of 9.62%-13.67%, and 4.2%-4.72%, 4.75%-8.96%, respectively. Two clusters (Loci-Chr4-2 and Loci-Chr5-4) harboring the QTL for four germination traits (GR, FER, GL, NL) and six seedling traits (GR, FER, DW, FW, SH, NL) were detected related under salt stress. A total of 691 genes were found in the candidate QTL or clusters. Among them, four genes (Gh_A04G1106, Gh_A05G3246, Gh_A05G3177, Gh_A05G3266) showed expression changes between sensitive and tolerant lines under salt stress, and were assigned as candidate genes in response to salt stress. The consistent salt-tolerance QTL identified in both germination and seedling stages will facilitate new information for cotton breeding.
2022-06-23 | GSE186533 | GEO
Project description:Increase soil salinization is affecting hull-less barley cultivation in the Qinghai-Tibet Plateau of China. Under saline conditions wild hull-less barley seeds showed high melatonin (MEL) accumulation during germination with improve salt tolerance. Hence, the present study aimed to understand the proteome level changes that result in high melatonin content in the germinating hull-less barley seed after treatment with 240mM-NaCl concentrations compared to control. Our results indicate that salt stress induced global changes in the proteome of germinating barley seeds. The NaCl treatment altered the expression and abundance of several proteins related to carbohydrate and energy metabolism, amino acid transport and metabolism which contributed to the high melatonin content in the seeds under salt stress. Further, proteins associated with cellular redox homeostasis, osmotic stress response and secondary metabolites derived from amino acid metabolism, including purine degradation, and shikimate pathways were induced in seeds with high melatonin content. Consequently, triggering a robust response to the oxidative stress occasioned by the NaCl-induced salt stress and lead to improved germination rate and salt stress adaptation in hull-less barley seeds. Overall our finding contribute to our understanding of the mechanism of melatonin mediated salt stress tolerance in barley at the protein level.
2021-11-29 | PXD030029 |