Abstract
Plants are confronted with a variety of environmenmtal stresses resulting in enhanced production of ROS. Plants require a threshold level of ROS for vital functions and any change in their concentration alters the entire physiology of plant. Delicate balance of ROS is maintained by an efficient functioning of intriguing indigenous defence system called antioxidant system comprising enzymatic and non enzymatic components. Down regulation of antioxidant system leads to ROS induced oxidative stress causing damage to important cellular structures and hence anomalies in metabolism. Proper mineral nutrition, in addition to other agricultural practices, forms an important part for growth and hence the yield. Potassium (K) is a key macro-element regulating growth and development through alterations in physiological and biochemical attributes. K has been reported to result into accumulation of osmolytes and augmentation of antioxidant components in the plants exposed to water and salt stress. In the present review an effort has been made to revisit the old findings and the current advances in research regarding the role of optimal, suboptimal and deficient K soil status on growth under normal and stressful conditions. Effect of K deficiency and sufficiency is discussed and the information about the K mediated antioxidant regulation and plant response is highlighted.
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Abbreviations
- ROS:
-
Reactive oxygen species
- PCD:
-
Programmed cell death
- ABA:
-
Abscisic acid
- SAR:
-
Sodium adsorption ratio
- ESP:
-
Exchangeable sodium percentage
- EC:
-
Electrical conductivity
- PSII:
-
Photosystem II
- HKT:
-
High affinity potassium transporter
- SOS:
-
Salt overly sensitive
- QTL:
-
Quantitative trait loci
- H2O2 :
-
Hydrogen peroxide
- O2 − :
-
Superoxide ion
- 1O2 :
-
Singlet oxygen
- O2 2− :
-
Peroxide
- O2H:
-
Perhydroxyl radical
- OH− :
-
Hydroxyl radical
- RO− :
-
Alkoxy radicals
- RNS:
-
Reactive nitrogen species
- NO:
-
Nitric oxide
- NO2 :
-
Nitric dioxide
- MDA:
-
Malondialdehyde
- SOD:
-
Superoxide dismutase
- APX:
-
Ascorbate peroxidase
- MDHAR:
-
Monodehydroascorbate reductase
- DHAR:
-
Dehydroascorbate reductase
- GR:
-
Glutathione reductase
- GST:
-
Glutathione-S-transferase
- AsA:
-
Ascorbic acid
- MDHA:
-
Monodehydroascorbate; oxidised ascorbate
- GSH:
-
Reduced glutathione
- GSSG:
-
Glutathione disulphide; oxidised glutathione
- PAL:
-
Phenylalanine ammonia lyase
- AKT:
-
Arabidopsis shaker type
- CNGC:
-
Cyclic nucleotide gated channel
- KUP/HAK:
-
High affinity potassium transporter
- NSCC:
-
Non selective cation channels
- NHX:
-
Sodium proton exchanger
- TPK1:
-
Tonoplast two pore K+ type channel
- GORK:
-
Guard cell outward-rectifying K+ channel
- SKOR:
-
Stelar K+ outward-rectifying channel
- HPODEs:
-
Hydroperoxy octadecadienoates
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Acknowledgements
Thanks are due to Head, School of Studies in Botany, Jiwaji University, Gwalior, MP for providing necessary facilities and thanks to Dr Shahid Umar, Hamdard University for sharing some of the literature. First author is highly thankful to Jiwaji University, Gwalior and MPCST, Bhopal for financial assistance. Funding was provided by Jiwaji University (Grant No. F/DEV/2013-14/33) and MPCST, Bhopal (Grant No. 1466/CST/R&D(BS)/2015).
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Ahanger, M.A., Tomar, N.S., Tittal, M. et al. Plant growth under water/salt stress: ROS production; antioxidants and significance of added potassium under such conditions. Physiol Mol Biol Plants 23, 731–744 (2017). https://doi.org/10.1007/s12298-017-0462-7
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DOI: https://doi.org/10.1007/s12298-017-0462-7