Dehydration stress memory: Insights from physiological responses of sugar apple (Annona squamosa L.) to repeated dehydration stress

Structural and physiological responses of chrysanthemum to repeated osmotic stress were studied. Plants were cultured for 2 weeks (for each stress1 and stress 2) on half MS supplemented with mannitol 100 mM (Treatment I) and 200 mM (Treatment II). First stress inhibited growth parameters stronger than second stress in treatment I. In treatment II both stress events strongly inhibited growth parameters of micro‐shoots. Proline content exceeded control 6 ‐ 8 times after 1st stress, and 2 ‐ 5 times after the 2nd stress in treatments I and II, respectively. Soluble protein was accumulated in leaves during both stress exposures, and 2 ‐ 2.5 times exceeded control after the 2nd stress. Relative water content in both treatments increased after the 2nd stress exposure. In treatment II chlorophyll а and carotenoids contents were 8.78 and 4.62 mg/g comparing to control (4.21 and 2.25 mg/g, respectively) after the 1st stress. But after the 2nd stress there was no difference with control.Plant Tissue Cult. & Biotech. 27(2): 161-169, 2017 (December)

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Morpho-physiological responses to dehydration stress of perennial ryegrass and tall fescue genotypes

Functional Plant Biology ◽

10.1071/fp16365 ◽

2017 ◽

Vol 44 (6) ◽

pp. 612 ◽

Cited By ~ 4

Author(s):

Reihaneh Shahidi ◽

Junko Yoshida ◽

Mathias Cougnon ◽

Dirk Reheul ◽

Marie-Christine Van Labeke

Keyword(s):

Drought Stress ◽

Tall Fescue ◽

Festuca Arundinacea ◽

Physiological Responses ◽

Dehydration Stress ◽

Similar Degree ◽

Sheep Grazing ◽

Chlorophyll Fluorescence Parameters ◽

Fluorescence Parameters ◽

Physiological Adaptations

Worldwide drought stress is the most important restriction factor on food and fodder productivity. In this study, morpho-physiological adaptations to dehydration stress were investigated in two tall fescue (Festuca arundinacea Schreb.) genotypes (Fa13 and Fa19 with a high and low sheep grazing preference respectively) and Lolium perenne L. Drought stress as evaluated by decreasing stomatal conductance and chlorophyll content, chlorophyll fluorescence parameters and fructan concentration were first observed in L. perenne (16 days after the start of the drought stress). Furthermore, after 20 days of drought stress the activities of ascorbate peroxide (APX), catalase (CAT), and superoxide dismutase (SOD) were reduced in stressed plants indicating that the capacity to scavenge ROS diminished under severe stress though no differences between genotypes were observed. Osmotic adjustment by carbohydrates did also not differ between the genotypes. Proline, however, reached its highest level in drought-stressed L. perenne followed by Fa13 and Fa19 respectively. The studied species showed a similar degree in response in the traits assessed when plants were exposed to dehydration stress; however changes were first observed in L. perenne.

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Dehydration stress memory genes of Zea mays; comparison with Arabidopsis thaliana

BMC Plant Biology ◽

10.1186/1471-2229-14-141 ◽

2014 ◽

Vol 14 (1) ◽

pp. 141 ◽

Cited By ~ 44

Author(s):

Yong Ding ◽

Laetitia Virlouvet ◽

Ning Liu ◽

Jean-Jack Riethoven ◽

Michael Fromm ◽

...

Keyword(s):

Arabidopsis Thaliana ◽

Zea Mays ◽

Dehydration Stress ◽

Stress Memory

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Four distinct types of dehydration stress memory genes in Arabidopsis thaliana

BMC Plant Biology ◽

10.1186/1471-2229-13-229 ◽

2013 ◽

Vol 13 (1) ◽

pp. 229 ◽

Cited By ~ 117

Author(s):

Yong Ding ◽

Ning Liu ◽

Laetitia Virlouvet ◽

Jean-Jack Riethoven ◽

Michael Fromm ◽

...

Keyword(s):

Arabidopsis Thaliana ◽

Dehydration Stress ◽

Stress Memory

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DNA methylation-mediated modulation of rapid desiccation tolerance acquisition and dehydration stress memory in the resurrection plant Boea hygrometrica

PLoS Genetics ◽

10.1371/journal.pgen.1009549 ◽

2021 ◽

Vol 17 (4) ◽

pp. e1009549

Author(s):

Run-Ze Sun ◽

Jie Liu ◽

Yuan-Yuan Wang ◽

Xin Deng

Keyword(s):

Dna Methylation ◽

Desiccation Tolerance ◽

Protein Modification ◽

Dehydration Stress ◽

Resurrection Plant ◽

Gene Body Methylation ◽

Dehydration Tolerance ◽

Stress Memory ◽

Drought Acclimation ◽

Boea Hygrometrica

Pre-exposure of plants to various abiotic conditions confers improved tolerance to subsequent stress. Mild drought acclimation induces acquired rapid desiccation tolerance (RDT) in the resurrection plant Boea hygrometrica, but the mechanisms underlying the priming and memory processes remain unclear. In this study, we demonstrated that drought acclimation-induced RDT can be maintained for at least four weeks but was completely erased after 18 weeks based on a combination of the phenotypic and physiological parameters. Global transcriptome analysis identified several RDT-specific rapid dehydration-responsive genes related to cytokinin and phospholipid biosynthesis, nitrogen and carbon metabolism, and epidermal morphogenesis, most of which were pre-induced by drought acclimation. Comparison of whole-genome DNA methylation revealed dehydration stress-responsive hypomethylation in the CG, CHG, and CHH contexts and acclimation-induced hypermethylation in the CHH context of the B. hygrometrica genome, consistent with the transcriptional changes in methylation pathway genes. As expected, the global promoter and gene body methylation levels were negatively correlated with gene expression levels in both acclimated and dehydrated plants but showed no association with transcriptional divergence during the procedure. Nevertheless, the promoter methylation variations in the CG and CHG contexts were significantly associated with the differential expression of genes required for fundamental genetic processes of DNA conformation, RNA splicing, translation, and post-translational protein modification during acclimation, growth, and rapid dehydration stress response. It was also associated with the dehydration stress-induced upregulation of memory genes, including pre-mRNA-splicing factor 38A, vacuolar amino acid transporter 1-like, and UDP-sugar pyrophosphorylase, which may contribute directly or indirectly to the improvement of dehydration tolerance in B. hygrometrica plants. Altogether, our findings demonstrate the potential implications of DNA methylation in dehydration stress memory and, therefore, provide a molecular basis for enhanced dehydration tolerance in plants induced by drought acclimation.

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H3K27me3 and H3K4me3 Chromatin Environment at Super-Induced Dehydration Stress Memory Genes of Arabidopsis thaliana

Molecular Plant ◽

10.1093/mp/ssu001 ◽

2014 ◽

Vol 7 (3) ◽

pp. 502-513 ◽

Cited By ~ 52

Author(s):

Ning Liu ◽

Michael Fromm ◽

Zoya Avramova

Keyword(s):

Arabidopsis Thaliana ◽

Dehydration Stress ◽

Stress Memory

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Misophonia: An Evidence-Based Case Report

American Journal of Audiology ◽

10.1044/2020_aja-19-00111 ◽

2020 ◽

Vol 29 (4) ◽

pp. 685-690

Author(s):

C. S. Vanaja ◽

Miriam Soni Abigail

Keyword(s):

Quality Of Life ◽

Case Report ◽

Case History ◽

Pure Tone ◽

Physiological Responses ◽

Evidence Based ◽

Management Option ◽

Pure Tone Audiogram

Purpose Misophonia is a sound tolerance disorder condition in certain sounds that trigger intense emotional or physiological responses. While some persons may experience misophonia, a few patients suffer from misophonia. However, there is a dearth of literature on audiological assessment and management of persons with misophonia. The purpose of this report is to discuss the assessment of misophonia and highlight the management option that helped a patient with misophonia. Method A case study of a 26-year-old woman with the complaint of decreased tolerance to specific sounds affecting quality of life is reported. Audiological assessment differentiated misophonia from hyperacusis. Management included retraining counseling as well as desensitization and habituation therapy based on the principles described by P. J. Jastreboff and Jastreboff (2014). A misophonia questionnaire was administered at regular intervals to monitor the effectiveness of therapy. Results A detailed case history and audiological evaluations including pure-tone audiogram and Johnson Hyperacusis Index revealed the presence of misophonia. The patient benefitted from intervention, and the scores of the misophonia questionnaire indicated a decrease in the severity of the problem. Conclusions It is important to differentially diagnose misophonia and hyperacusis in persons with sound tolerance disorders. Retraining counseling as well as desensitization and habituation therapy can help patients who suffer from misophonia.

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