Plant Oxidative Stress and the Role of Ascorbate–Glutathione Cycle in Salt Stress Tolerance

2015 ◽  
pp. 238-255 ◽  
Keyword(s):  
Oxidative Stress ◽  
Salt Stress ◽  
Stress Tolerance ◽  
Salt Stress Tolerance ◽  
Glutathione Cycle

scholarly journals Characterization of wheat (Triticum aestivum) TIFY family and role of Triticum Durum TdTIFY11a in salt stress tolerance

PLoS ONE ◽  
2018 ◽  
Vol 13 (7) ◽  
pp. e0200566 ◽  
Author(s):  
Chantal Ebel ◽  
Asma BenFeki ◽  
Moez Hanin ◽  
Roberto Solano ◽  
Andrea Chini
Keyword(s):  
Triticum Aestivum ◽  
Salt Stress ◽  
Stress Tolerance ◽  
Triticum Durum ◽  
Salt Stress Tolerance

scholarly journals Salt stress tolerance in cowpea is poorly related to the ability to cope with oxidative stress

2014 ◽  
Vol 73 (1) ◽  
pp. 78-89 ◽  
Author(s):  
Sidney C. Praxedes ◽  
Fábio M. Damatta ◽  
Claudivan F. De Lacerda ◽  
José T. Prisco ◽  
Enéas Gomes-Filho
Keyword(s):  
Oxidative Stress ◽  
Salt Stress ◽  
Oxidative Damage ◽  
Stress Tolerance ◽  
Reducing Power ◽  
Guaiacol Peroxidase ◽  
Salt Stress Tolerance ◽  
Sod Activity ◽  
Functional Link ◽  
Leaves And Roots

Abstract We have previously demonstrated that salt tolerance in cowpea could be associated with lesser impairments of the photosynthetic capacity. Taking into account that photosynthesis is the main sink for reducing power consumption, our central working hypothesis is that a salt-sensitive cultivar is more prone to suffer from oxidative stress. We analyzed the long-term effects of salt stress on oxidative damage and protection against reactive oxygen species in both leaves and roots of a salt-tolerant (Pitiúba) and a salt-sensitive (TVu) cowpea cultivar. Two salt treatments (0 and 75 mM NaCl) were applied to 10-day-old plants grown in nutrient solution for 24 days. Significant salt-induced oxidative damage as demonstrated via increases in malondialdehyde concentration were noted, particularly in leaves at the end of the experiment, although such damage was found earlier in Pitiúba. In salt-stressed plants, superoxide dismutase (SOD) activity increased only in Pitiúba at 24 days from the start of salt additions (DSSA). In Pitiúba, catalase (CAT) was not significantly affected by the treatments, whereas in TVu its activity was dramatically lower in salt-stressed plants at 10DSSAonwards. In general salt stress led to significant increases, much more pronounced in ascorbate peroxidase (APX), glutathione reductase (GR) and guaiacol peroxidase (GPX), at the end of the experiment in both cultivars. In roots, salt-induced increases in enzyme activities were particularly noted at 24 DSSA, as found for SOD and APX in Pitiúba, CAT in TVu and GR and GPX in both cultivars. Therefore, in contrast to our expectations, the present results argue, to a great extent, against a functional link between salt stress tolerance and the expression of the antioxidant system. We also demonstrated that leaves and roots should be evaluated for a full assessment of whole plant acclimation to salt stress.

scholarly journals Role of HSP90 in Salt Stress Tolerance via Stabilization and Regulation of Calcineurin

2000 ◽  
Vol 20 (24) ◽  
pp. 9262-9270 ◽  
Author(s):  
Jun Imai ◽  
Ichiro Yahara
Keyword(s):  
Gene Expression ◽  
Saccharomyces Cerevisiae ◽  
Salt Stress ◽  
Stress Tolerance ◽  
Normal Level ◽  
Immune Complexes ◽  
Salt Stress Tolerance ◽  
Stressed Cells ◽  
Calcineurin Activity

ABSTRACT The role of HSP90 in stress tolerance was investigated inSaccharomyces cerevisiae. Cells showing 20-fold overexpression of Hsc82, an HSP90 homologue in yeast, were hypersensitive to high-NaCl or H-LiCl stresses. Hsc82-overexpressing cells appeared similar to calcineurin-defective cells in salt sensitivity and showed reduced levels of calcineurin-dependent gene expression. Co-overexpression of Cna2, the catalytic subunit of calcineurin, suppressed the hypersensitivity. Cna2 and Hsc82 coimmunoprecipitated from control cells grown under normal conditions but not from stressed cells. In contrast, coimmunoprecipitation was detected with Hsc82-overexpressing cells even after exposure to stresses. Cna2 immune complexes from stressed control cells showed a significant level of calcineurin activity, whereas those from stressed Hsc82-overexpressing cells did not. Treatment of extracts from Hsc82-overexpressing cells with Ca2+-calmodulin increased the calcineurin activity associated with Cna2 immune complexes. Geldanamycin, an inhibitor of HSP90 abolished the coimmunoprecipitation but did not activate calcineurin. When the expression level of Hsc82 decreased to below 30% of the normal level, cells also became hypersensitive to salt stress. In these cells, the amount of Cna2 was reduced, likely as a result of degradation. The present results showed that Hsc82 binds to and stabilizes Cna2 and that dissociation of Cna2 from Hsc82 is necessary for its activation.

scholarly journals Mechanism of Salt Stress Tolerance in Plants: Role of Cation/H+ Antiporters

2020 ◽  
Vol 42 (3) ◽  
Author(s):  
Qurban Ali ◽  
Muzammal Mateen Azhar ◽  
Arif Malik ◽  
Shahbaz Ahmad ◽  
Muhammad Zafar Saleem ◽  
...  
Keyword(s):  
Salt Stress ◽  
Stress Tolerance ◽  
Salt Stress Tolerance

scholarly journals Coordinated Role of Nitric Oxide, Ethylene, Nitrogen, and Sulfur in Plant Salt Stress Tolerance

Stresses ◽  
2021 ◽  
Vol 1 (3) ◽  
pp. 181-199
Author(s):  
Badar Jahan ◽  
Faisal Rasheed ◽  
Zebus Sehar ◽  
Mehar Fatma ◽  
Noushina Iqbal ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Salt Stress ◽  
Stress Tolerance ◽  
Signaling Molecules ◽  
Mineral Nutrients ◽  
Mineral Nutrient ◽  
Plant Tolerance ◽  
Salt Stress Tolerance ◽  
Gaseous Signaling Molecules

Salt stress significantly contributes to major losses in agricultural productivity worldwide. The sustainable approach for salinity-accrued toxicity has been explored. The use of plant growth regulators/phytohormones, mineral nutrients and other signaling molecules is one of the major approaches for reversing salt-induced toxicity in plants. Application of the signaling molecules such as nitric oxide (NO) and ethylene (ETH) and major mineral nutrient such as nitrogen (N) and sulfur (S) play significant roles in combatting the major consequences of salt stress impacts in plants. However, the literature available on gaseous signaling molecules (NO/ETH) or/and mineral nutrients (N/S) stands alone, and major insights into the role of NO or/and ETH along with N and S in plant-tolerance to salt remained unclear. Thus, this review aimed to (a) briefly overview salt stress and highlight salt-induced toxicity, (b) appraise the literature reporting potential mechanisms underlying the role of gaseous signaling molecules and mineral nutrient in salt stress tolerance, and (c) discuss NO and ETH along with N and S in relation to salt stress tolerance. In addition, significant issues that have still to be investigated in this context have been mentioned.

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