Ionic Basis of Salt Tolerance in Plants: Nutrient Homeostasis and Oxidative Stress Tolerance

Chakraborty, Koushik; Basak, Nabaneeta; Ray, Soham; Vijayan, Joshitha; Sarkar, Ramani Kumar

doi:10.1007/978-981-10-9044-8_14

Cited by 34 publications

(24 citation statements)

References 201 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In general, salinity problems have been related to an excess of NaCl in the irrigation water, which causes Na + toxicity in the plants, modifies the absorption of K + and other nutrients by the roots, and exerts severe toxic effects on genes and enzymes, causing detrimental alterations to the plant’s metabolism [39,40,41]. Therefore, it is vital for plants to re-establish cellular ionic homeostasis to maintain correct metabolic functioning and growth.…”

Section: Resultsmentioning

confidence: 99%

Amelioration of the Oxidative Stress Generated by Simple or Combined Abiotic Stress through the K+ and Ca2+ Supplementation in Tomato Plants

et al. 2019

View full text Add to dashboard Cite

Abiotic stressors such as drought, heat, or salinity are major causes of yield loss worldwide due to the oxidative burst generated under these conditions. Recent studies have revealed that plant response to a combination of different environmental stressors is unique and cannot be deduced from the response developed to each stress when applied individually. Some studies have demonstrated that a different management of some nutrients in the irrigation solution may provide an advantage to the plants against abiotic stressors. Thus, the aim of this study was to investigate if an increase in potassium (K+) and calcium (Ca2+) concentration in the nutrient solution may have a positive effect on the amelioration of oxidative stress which occurs under the combination of salinity and heat in tomato plants. Our results indicated that plants irrigated with an increase in K+ and Ca2+ concentrations in the irrigation solution from 7mM (K+) to 9.8 mM and from 4 mM (Ca2+) to 5.6 mM, respectively, induced a recovery of the biomass production compared to the plants treated with salinity or salinity + heat, and subsequently irrigated with the regular Hoagland solution. This was correlated with a better performance of all the photosynthetic parameters, a reduction in the foliar concentration of H2O2 and a lower lipid peroxidation rate, and with a better performance of the antioxidant enzymes ascorbate peroxidase ascorbate peroxidase (APX), dehydroascorbate reductactase (DHAR), glutathione reductase (GR), and NADPH oxidase. Our results showed that these enzymes were differentially regulated at the transcriptional level, showing a higher reactive oxygen species (ROS) detoxification efficiency under salinity and under the combination of salinity and heat, as compared to those plants irrigated with common Hoagland. An increase in K+ and Ca2+ in the irrigation solution also induced a lower Na+ accumulation in leaves and a higher K+/Na+ ratio. Thus, our study highlights the importance of the right management of the plant nutritional status and fertilization in order to counteract the deleterious effects of abiotic stress in plants.

show abstract

Section: Resultsmentioning

confidence: 99%

Amelioration of the Oxidative Stress Generated by Simple or Combined Abiotic Stress through the K+ and Ca2+ Supplementation in Tomato Plants

et al. 2019

View full text Add to dashboard Cite

show abstract

“…The excess Na + present in the growing media causes several metabolic imbalances hindering normal growth. Among different complexities of stress tolerance mechanisms, maintaining an optimal cytosolic Na + /K + ratio is still considered to be the most critical aspect of salt tolerance (Chakraborty et al, 2018). To maintain the optimal cytosolic Na + /K + ratio in metabolically active tissues, plants need to perform highly energy-consuming processes of Na + exclusion or sequestration coupled with cytosolic K + retention or better uptake of K + from an environment dominated by Na + .…”

Section: Discussionmentioning

confidence: 99%

“…Rapid induction of plasma membrane and vacuolar proton pumps to maintain negative membrane potential and to facilitate Na + /H + pumps was reported in salt-tolerant genotypes under stress (Vera-Estrella et al, 2005;Shabala and Mackay, 2011). Both Na + exclusion and K + uptake from rhizospheric region and selective upward transport mediated by xylem unloading is energy dependent and supported by increased action of ATPases and pyrophosphatases (Chakraborty et al, 2018;Niu et al, 2018a;Huang et al, 2019). To date, there are 11 variants of AHA (a plasma membrane ATPase) reported in rice (Ueno et al, 2005).…”

Section: Differential Induction Of H + Pumps Suggests Relative Importmentioning

confidence: 99%

Tissue Tolerance Coupled With Ionic Discrimination Can Potentially Minimize the Energy Cost of Salinity Tolerance in Rice

et al. 2020

Self Cite

View full text Add to dashboard Cite

Salinity is one of the major constraints in rice production. To date, development of salt-tolerant rice cultivar is primarily focused on salt-exclusion strategies, which incur greater energy cost. The present study aimed to evaluate a balancing strategy of ionic discrimination vis-à-vis tissue tolerance, which could potentially minimize the energy cost of salt tolerance in rice. Four rice genotypes, viz., FL478, IR29, Kamini, and AC847, were grown hydroponically and subjected to salt stress equivalent to 12 dS m −1 at early vegetative stage. Different physiological observations (leaf chlorophyll content, chlorophyll fluorescence traits, and tissue Na + and K + content) and visual scoring suggested a superior Na +-partitioning strategy operating in FL478. A very low tissue Na + /K + ratio in the leaves of FL478 after 7 days of stress hinted the existence of selective ion transport mechanism in this genotype. On the contrary, Kamini, an equally salt-tolerant genotype, was found to possess a higher leaf Na + /K + ratio than does FL478 under similar stress condition. Salt-induced expression of different Na + and K + transporters indicated significant upregulation of SOS, HKT, NHX, and HAK groups of transporters in both leaves and roots of FL478, followed by Kamini. The expression of plasma membrane and vacuolar H + pumps (OsAHA1, OsAHA7, and OsV-ATPase) were also upregulated in these two genotypes. On the other hand, IR29 and AC847 showed greater salt susceptibility owing to excess upward transport of Na + and eventually died within a few days of stress imposition. But in the "leaf clip" assay, it was found that both IR29 and Kamini had high tissue-tolerance and chlorophyll-retention abilities. On the contrary, FL478, although having higher ionic-discrimination ability, showed the least degree of tissue tolerance as evident from the LC 50 score (amount of Na + required to reduce the initial chlorophyll content to half) of 336 mmol g −1 as against 459 and 424 mmol g −1 for IR29 and Kamini, respectively. Overall, the present study indicated that two components (ionic selectivity and tissue tolerance) of salt tolerance mechanism are distinct in rice. Unique genotypes like Kamini could effectively balance both of these strategies to achieve considerable salt tolerance, perhaps with lesser energy cost.

show abstract

“…58,59 The amplitude and duration of the Ca 2+ transient are determined by the activity of vacuolar membrane H + /Ca 2+ antiporter (Vcx1p) and endomembrane localized Ca 2+ -ATPases. 60,61 Ca 2+ transients are also involved in activation of responsible channels for ion influx and energy dependent transport systems that contribute to the divalent cation compartmentalization. It has been reported that the salt stress-induced elevation in cytosolic Ca 2+ and the new cytosolic Ca 2+ status is regulated by CAX1, ECA (ATP-driven Ca 2+ pump) and ACA Ca 2+ -ATPases (auto-inhibited Ca 2+ -ATPases).…”

Section: Mechanism Of Salt Stress Perceptionmentioning

confidence: 99%

Calcium signaling and salt tolerance are diversely entwined in plants

Seifikalhor

Aliniaeifard

Shomali

et al. 2019

Plant Signaling & Behavior

141

View full text Add to dashboard Cite

In plants dehydration imposed by salinity can invoke physical changes at the interface of the plasma membrane and cell wall. Changes in hydrostatic pressure activate ion channels and cause depolarization of the plasma membrane due to disturbance in ion transport. During the initial phases of salinity stress, the relatively high osmotic potential of the rhizosphere enforces the plant to use a diverse spectrum of strategies to optimize water and nutrient uptake. Signals of salt stress are recognized by specific root receptors that activate an osmosensing network. Plant response to hyperosmotic tension is closely linked to the calcium (Ca 2+) channels and interacting proteins such as calmodulin. A rapid rise in cytosolic Ca 2+ levels occurs within seconds of exposure to salt stress. Plants employ multiple sensors and signaling components to sense and respond to salinity stress, of which most are closely related to Ca 2+ sensing and signaling. Several tolerance strategies such as osmoprotectant accumulation, antioxidant boosting, polyaminses and nitric oxide (NO) machineries are also coordinated by Ca 2+ signaling. Substantial research has been done to discover the salt stress pathway and tolerance mechanism in plants, resulting in new insights into the perception of salt stress and the downstream signaling that happens in response. Nevertheless, the role of multifunctional components such as Ca 2+ has not been sufficiently addressed in the context of salt stress. In this review, we elaborate that the salt tolerance signaling pathway converges with Ca 2+ signaling in diverse pathways. We summarize knowledge related to different dimensions of salt stress signaling pathways in the cell by emphasizing the administrative role of Ca 2+ signaling on salt perception, signaling, gene expression, ion homeostasis and adaptive responses.

show abstract

Ionic Basis of Salt Tolerance in Plants: Nutrient Homeostasis and Oxidative Stress Tolerance

Cited by 34 publications

References 201 publications

Amelioration of the Oxidative Stress Generated by Simple or Combined Abiotic Stress through the K+ and Ca2+ Supplementation in Tomato Plants

Amelioration of the Oxidative Stress Generated by Simple or Combined Abiotic Stress through the K+ and Ca2+ Supplementation in Tomato Plants

Tissue Tolerance Coupled With Ionic Discrimination Can Potentially Minimize the Energy Cost of Salinity Tolerance in Rice

Calcium signaling and salt tolerance are diversely entwined in plants

Contact Info

Product

Resources

About