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ABSTRACT:
PROVIDER: PRJNA949950 | ENA |
REPOSITORIES: ENA
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Project description:Our recently published results demonstrated a crucial role for plastid terminal oxidase (PTOX) as an alternative electron pathway in the halophyte Spartina alterniflora (S. alterniflora) under salt stress but not for the glycophyte Setaria viridis (S. viridis). Herein, the effect of salt on the photosynthetic electron transport and RNA-seq analysis was probed in Setaria and its salt-tolerant close relative S. alterniflora. Initially, plants were grown at soil then were salt-treated under hydroponic conditions for two weeks. Setaria shows high vulnerability to salt compared to Spartina; while, Setaria was unable to survive exposure to greater than 100 mM, Spartina could tolerate salt concentrations as high as 550 mM with merely negligible effect on gas exchange and conductance of electrons transport chain (gETC). After exposure to salt, the prompt fluorescence (OJIP-curves) reveals an increase in the O- and J-steps in Setaria and very less or no change for SA. This suggests a higher QA over-reduction in Setaria than in Spartina. Following salt treatment, a dramatic decline in PSII primary photochemistry for Setaria was observed, as displayed by the drastic drop in Fv/Fm, Fv/Fo and ΦPSII. However, no substantial change was recorded regarding these parameters for Spartina under NaCl treatment. Interestingly, we report an improvement in primary PSII photochemistry (ΦPSII) for Spartina with increasing either salt concentration or duration. Besides, the magnitude of NPQ dynamics was strongly enhanced for Setaria even at low NaCl level (50 mM); however, it remains unchangeable or slightly increased for Spartina at high NaCl concentrations (above 400 mM). For plants endured salt, we notice an increase in both the proportion of oxidized P700 and the amount of active P700 in Setaria and almost no change for Spartina. The slowdown of electrons flow through PSII was accompanied by a dramatic decline in gETC. Under salt, CO2 assimilation (A) and stomatal conductance (gs) evaluations demonstrate that A decreases earlier, even after one week exposure to only 50 mM NaCl for Setaria; however, the effect of salt was negligible in Spartina regarding these two parameters even after exposure for two weeks to high salt levels (400 and 550 mM). For Setaria exposed for 12 d to salt, the use of 2,000 μmol m-2 s-1 external CO2 was not sufficient to fully restore A to the control level as assessed by A-Ci curves, even for 50 mM salt. The A at all NaCl levels, except 550 mM, was able to completely recover to initial level before stress in Spartina. RNAseq analysis shows a stimulation of oxido-reduction reactions in Setaria. Gene onthology (GO) enrichment emphasizes differentially expressed genes (DEGs) and some transcription factors (TFs) under salt. The up-regulated genes in Setaria are related to three metabolic processes; C4, photorespiration and the oxidation/reduction pathways. Some other specifically highly up-regulated genes in Setaria are mostly related to TFs including DNA-binding transcription factor activity, stress marker genes such as peroxidase and senescence-related genes such as flavonol synthase.
2022-03-09 | GSE146718 | GEO
Project description:The experiment was designed to test the interactions of Spartina alterniflora, its microbiome, and the interaction of the plant-microbe relationship with oil from the Deepwater Horizon oil spill (DWH). Total RNA was extracted from leaf and root microbiome of S. alterniflora in soils that were oiled in DWH oil spill with or without added oil, as well as those grown in unoiled soil with or without added oil. The work in its entirety characterizes the transport, fate and catabolic activities of bacterial communities in petroleum-polluted soils and within plant tissues.
2020-04-10 | GSE148431 | GEO
Project description:To identify novel miRNA and NAT-siRNAs that are associated with abiotic stresses in maize, we generated small RNA sequences from maize seedlings that grew under control and under dought, salt, and cold stress treatments.
2015-10-21 | GSE33211 | GEO
Project description:To identify novel miRNA and NAT-siRNAs that are associated with abiotic stresses in sorghum, we generated small RNA sequences from sorghum seedlings that grew under control and under dought, salt, and cold stress treatments.
2015-10-25 | GSE33237 | GEO
Project description:Purpose:Identification of genes and miRNAs responsible for salt tolerance in upland cotton (Gossypium hirsutum L.) would help reveal the molecular mechanisms of salt tolerance. We performed physiological experiments and transcriptome sequencing (mRNA-seq and small RNA-seq) of cotton leaves under salt stress using Illumina sequencing technology. And quantitative reverse transcription polymerase chain reaction (qRT–PCR) methods and to evaluate protocols for optimal high-throughput data analysis Methods:We investigated two distinct salt stress phases—dehydration (4 h) and ionic stress (osmotic restoration; 24 h)—that were identified by physiological changes of 14-day-old seedlings of two cotton genotypes, one salt tolerant and the other salt sensitive, during a 72-h NaCl exposure. A comparative transcriptomics approach was used to monitor gene and miRNA differential expression at two time points (4 and 24 h) in leaves of the two cotton genotypes under salinity conditions. Results:During a 24-h salt exposure, 819 transcription factor unigenes were differentially expressed in both genotypes, with 129 unigenes specifically expressed in the salt-tolerant genotype. Under salt stress, 108 conserved miRNAs from known families were differentially expressed at two time points in the salt-tolerant genotype. Conclusions:Our comprehensive transcriptome analysis has provided new insights into salt-stress response of upland cotton. The results should contribute to the development of genetically modified cotton with salt tolerance.
2017-06-18 | GSE58655 | GEO
Project description:Soybean is one of the main sources of oil worldwide. Salinity severely affect its yield. GmSIN1 is a NAC transcription factor coding gene. Its overexpression (OE) transgenic lines greatly improved the yield in both common and saline fields. This study focuses on founding changes genes between GmSIN1 OE transgenic seedlings and control seedlings under salt stress or non-salt stress conditions. Illumina Solexa sequencing platform was used for the comparative analysis of transcriptome profiles in the roots and leaves of GmSIN1 OE transgenic seedlings and WEI6823 (control) seedlings under mock or 150 mM NaCl treatment for 6 hrs.
2019-08-01 | GSE93322 | GEO