scholarly journals Light affects salt stress-induced transcriptional memory ofP5CS1inArabidopsis

2016 ◽  
Vol 113 (51) ◽  
pp. E8335-E8343 ◽  
Author(s):  
Xuan Jun Feng ◽  
Jing Rui Li ◽  
Shi Lian Qi ◽  
Qing Fang Lin ◽  
Jing Bo Jin ◽  
...  
Keyword(s):  
Salt Stress ◽  
Higher Plants ◽  
Light Exposure ◽  
Environmental Stresses ◽  
Proline Accumulation ◽  
Metabolic Adaptation ◽  
Recovery Stage ◽  
Stress Memory ◽  
Memory Response ◽  
Transcriptional Memory

To cope with environmental stresses, plants often adopt a memory response upon primary stress exposure to facilitate a quicker and stronger reaction to recurring stresses. However, it remains unknown whether light is involved in the manifestation of stress memory. Proline accumulation is a striking metabolic adaptation of higher plants during various environmental stresses. Here we show that salinity-induced proline accumulation is memorable and HY5-dependent light signaling is required for such a memory response. Primary salt stress induced the expression of Δ1-pyrroline-5-carboxylate synthetase 1 (P5CS1), encoding a proline biosynthetic enzyme and proline accumulation, which were reduced to basal level during the recovery stage. Reoccurring salt stress-induced strongerP5CS1expression and proline accumulation were dependent upon light exposure during the recovery stage. Further studies demonstrated that salt-induced transcriptional memory ofP5CS1is associated with the retention of increased H3K4me3 level atP5CS1during the recovery stage. HY5 binds directly to light-responsive element, C/A-box, in theP5CS1promoter. Deletion of the C/A-box orhy5 hyhmutations caused rapid reduction of H3K4me3 level atP5CS1during the recovery stage, resulting in impairment of the stress memory response. These results unveil a previously unrecognized mechanism whereby light regulates salt-induced transcriptional memory via the function of HY5 in maintaining H3K4me3 level at the memory gene.

scholarly journals CSN5A Subunit of COP9 Signalosome Is Required for Resetting Transcriptional Stress Memory after Recurrent Heat Stress in Arabidopsis

Biomolecules ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 668
Author(s):  
Amit Kumar Singh ◽  
Shanmuhapreya Dhanapal ◽  
Alin Finkelshtein ◽  
Daniel A. Chamovitz
Keyword(s):  
Transcription Factors ◽  
Heat Stress ◽  
Histone Methylation ◽  
Environmental Stresses ◽  
Cop9 Signalosome ◽  
Stress Memory ◽  
Transcriptional Stress ◽  
Transcriptional Memory

In nature, plants are exposed to several environmental stresses that can be continuous or recurring. Continuous stress can be lethal, but stress after priming can increase the tolerance of a plant to better prepare for future stresses. Reports have suggested that transcription factors are involved in stress memory after recurrent stress; however, less is known about the factors that regulate the resetting of stress memory. Here, we uncovered a role for Constitutive Photomorphogenesis 5A (CSN5A) in the regulation of stress memory for resetting transcriptional memory genes (APX2 and HSP22) and H3K4me3 following recurrent heat stress. Furthermore, CSN5A is also required for the deposition of H3K4me3 following recurrent heat stress. Thus, CSN5A plays an important role in the regulation of histone methylation and transcriptional stress memory after recurrent heat stress.

Stress memory gene FaHSP17.8-CII controls thermotolerance via remodeling PSII and ROS signaling in tall fescue

2021 ◽  
Author(s):  
Aoyue Bi ◽  
Tao Wang ◽  
Guangyang Wang ◽  
Liang Zhang ◽  
Misganaw Wassie ◽  
...  
Keyword(s):  
High Temperature ◽  
Tall Fescue ◽  
Limiting Factor ◽  
Cool Season ◽  
Stress Memory ◽  
Memory Response ◽  
Ultra Structure ◽  
Psii Activity ◽  
Ros Accumulation ◽  
Transcriptional Memory

Abstract High-temperature is the most limiting factor in the growth of cool-season turfgrass. To cope with high-temperature stress, grass often adopt a memory response by remembering one past recurring stress and preparing a quicker and more robust reaction to the next stress exposure. However, little is known about how stress memory genes regulate the thermomemory response in cool-season turfgrass. Here, we characterized a transcriptional memory gene, Fa-heat shock protein 17.8 Class II (FaHSP17.8-CII) in a cool-season turfgrass species, tall fescue (Festuca arundinacea Schreb.). The thermomemory of FaHSP17.8-CII continued for more than four days and was associated with a high H3K4me3 level in tall fescue under heat stress (HS). Furthermore, heat acclimation or priming (ACC)-induced reactive oxygen species (ROS) accumulation and photosystem II (PSII) electron transport were memorable, and this memory response was controlled by FaHSP17.8-CII. In the fahsp17.8-CII mutant generated using CRISPR/Cas9, ACC+HS did not substantially block the ROS accumulation, the degeneration of chloroplast ultra-structure and the inhibition of PSII activity compared to HS alone. However, overexpression of FaHSP17.8-CII in tall fescue reduced ROS accumulation and chloroplast ultra-structure damage, and improved chlorophyll content and PSII activity under ACC+HS compared with that HS alone. These findings unveil a FaHSP17.8-CII–PSII-ROS module regulating transcriptional memory to enhance thermotolerance in cool-season turfgrass.

scholarly journals Inducing salt tolerance in sweet corn by magnetic priming

2017 ◽  
Vol 109 (1) ◽  
pp. 89 ◽  
Author(s):  
Soheil Karimi ◽  
Saeid ESHGHI ◽  
Saeid KARIMI ◽  
Saman HASAN-NEZHADIAN
Keyword(s):  
Salt Stress ◽  
Seed Germination ◽  
Plant Growth ◽  
Sweet Corn ◽  
Germination Rate ◽  
Nacl Stress ◽  
Proline Accumulation ◽  
Membrane Thermostability ◽  
Germination And Growth ◽  
Magnetic Priming

<p>This study evaluates seed germination and growth of sweet corn under NaCl stress (0, 50, and 100 mM), after exposing the seeds to weak (15 mT) or strong (150 mT) magnetic fields (MF) for different durations (0, 6, 12, and 24 hours). Salinity reduced seed germination and plant growth. MF treatments enhanced rate and percentage of germination and improved plant growth, regardless of salinity. Higher germination rate was obtained by the stronger MF, however, the seedling were more vigorous after priming with 15 mT MF. Proline accumulation was observed in parallel with the loss of plant water content under 100 mM NaCl stress. MF prevented proline accumulation by improving water absorption. Positive correlation between H<sub>2</sub>O<sub>2</sub> accumulation and membrane thermostability (MTI) was found after MF treatments, which revealed that MF primed the plant for salinity by H<sub>2</sub>O<sub>2</sub> signaling. However, over-accumulation of H<sub>2</sub>O<sub>2</sub> after prolonged MF exposure adversely affected MTI under severe salt stress. In conclusion, magnetic priming for 6 hours was suggested for enhancing germination and growth of sweet corn under salt stress.</p>

The role of NO in plant response to salt stress: interactions with polyamines

2020 ◽  
Vol 47 (10) ◽  
pp. 865
Author(s):  
Natalia Napieraj ◽  
Małgorzata Reda ◽  
Małgorzata Janicka
Keyword(s):  
Salt Stress ◽  
Higher Plants ◽  
Growth Parameters ◽  
Plant Response ◽  
No Donors ◽  
Signalling Molecule ◽  
Defence Responses ◽  
High Concentrations ◽  
Ionic Effects

Soil salinity is a major abiotic stress that limits plant growth and productivity. High concentrations of sodium chloride can cause osmotic and ionic effects. This stress minimises a plant’s ability to uptake water and minerals, and increases Na+ accumulation in the cytosol, thereby disturbing metabolic processes. Prolonged plant exposure to salt stress can lead to oxidative stress and increased production of reactive oxygen species (ROS). Higher plants developed some strategies to cope with salt stress. Among these, mechanisms involving nitric oxide (NO) and polyamines (PAs) are particularly important. NO is a key signalling molecule that mediates a variety of physiological functions and defence responses against abiotic stresses in plants. Under salinity conditions, NO donors increase growth parameters, reduce Na+ toxicity, maintain ionic homeostasis, stimulate osmolyte accumulation and prevent damages caused by ROS. NO enhances salt tolerance of plants via post-translational protein modifications through S-nitrosylation of thiol groups, nitration of tyrosine residues and modulation of multiple gene expression. Several reviews have reported on the role of polyamines in modulating salt stress plant response and the capacity to enhance PA synthesis upon salt stress exposure, and it is known that NO and PAs interact under salinity. In this review, we focus on the role of NO in plant response to salt stress, paying particular attention to the interaction between NO and PAs.

Metabolic adaptation of Escherichia coli to long-term exposure to salt stress

2010 ◽  
Vol 45 (9) ◽  
pp. 1459-1467 ◽  
Author(s):  
Paula Arense ◽  
Vicente Bernal ◽  
José L. Iborra ◽  
Manuel Cánovas
Keyword(s):  
Escherichia Coli ◽  
Salt Stress ◽  
Metabolic Adaptation

scholarly journals (447) Response of Two Salt-stressed Cultivars of Sweetpotato to Changes in Calcium Levels under In Vitro Conditions

HortScience ◽  
2005 ◽  
Vol 40 (4) ◽  
pp. 1035A-1035
Author(s):  
Devi Prasad V. Potluri ◽  
Nkechiyere Nwami
Keyword(s):  
Salt Stress ◽  
Dry Weight ◽  
Proline Accumulation ◽  
Metabolic Changes ◽  
Soluble Carbohydrate ◽  
Ms Medium ◽  
Shoot Height ◽  
Weight Number ◽  
Adverse Affects

Two cultivars of sweetpotato, `Commensal' and `Salyboro', were subjected to salt stress using axillary bud cultures. The salt levels ranged from 0 to 10 g·L-1. After the initial experiments, levels of calcium in the medium were changed from 3 mm in the MS medium to 1.5, 6, and 12 mm. After 10 weeks of growth, plantlet shoot height, dry weight, number of nodes, levels of proline, soluble carbohydrate, and protein were measured. `Commensal' was tolerant to salt levels up to 4 g·L-1, but `Salyboro' was sensitive to concentrations of salt even at lower concentrations as evidenced by the growth and dry weight. Proline accumulation was higher in the shoot than in the root. The protein: carbohydrate ratios did not change much in `Commensal', but levels of carbohydrates increased in `Salyboro'. Reduction in calcium levels had a synergistic affect on salt-stressed cultivars. Enhanced levels of calcium reduced the inhibitory affects of salt stress. This was more pronounced in `Salyboro', which was susceptible. Proline levels were higher in plants subjected to salt stress and higher levels of calcium than controls, but lower than the plants subjected to salt stress. These and other metabolic changes suggest that calcium can reduce the adverse affects of salt stress in these two sweetpotato cultivars.

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