Plants’ Response Mechanisms to Salinity Stress
Abstract
:1. Soil Salinization: A Major Global Issue
2. Impacts and Consequences of Salt Stress on Plants: A Challenge for Sustainable Agriculture
2.1. Growth of Plants
2.2. Photosynthesis
2.3. Nutrient Balance
2.4. Water Relations
2.5. Yield
3. Alleviation of Salt Stress by Various Strategies in Plants
3.1. Accumulation of Osmotic Adjustment Substances
3.2. Ion Homeostasis and Compartmentalization
3.2.1. Salt Overly Sensitive (SOS) Genes
3.2.2. High-Affinity Potassium Transporters (HKTs)
3.2.3. Proton Pumps
3.2.4. Na+/H+ Antiporter (NHX)
3.3. Oxidative Stress and Antioxidant Defense under Salt-Stress Conditions
3.4. Phytohormone-Mediated Salt Tolerance
3.5. Epigenetic Regulations on Salt-Stress Tolerance
4. Crop Breeding Strategies for Achieving Salt Tolerance
5. Utilization of QTL Knowledge on Salt Tolerance
6. Genetic Engineering of Salt Tolerance in Plants
Source Organism | Gene | Transgenic Host | Improved Trait under Salinity Stress | References |
---|---|---|---|---|
Vacuolar Na+(K+)/H+ antiporter | ||||
Arabidopsis thaliana | AtNHX1 | Actinidia deliciosa | Greater osmotic adjustment and antioxidant capacity in transgenics | [172] |
Arabidopsis thaliana | AtNHX1 | Fagopyrum esculentum | Accumulation of more rutin | [173] |
Arabidopsis thaliana | AtNHX2 | Gossypium hirsutum L. | Greater yield of better-quality cotton fiber | [115] |
Arabidopsis thaliana | AtNHX3 | Brassica napus | Unaffected seed yield and seed oil quality under saline conditions | [174] |
Arabidopsis thaliana | AtNHX4 | Arachis hypogaea L. | Elevated rate of photosynthesis | [175] |
Arabidopsis thaliana | AtNHX3 | Beta vulgaris | Increased salt accumulation in leaves, greater root storage with higher soluble sugars | [176] |
Gossypium hirsutum | GhNHX1 | Nicotiana tabacum | Increased Na+ compartmentalization | [177] |
Pennisetum glaucum | PgNHX1 | Oryza sativa | Robust root system | [178] |
Solanum torvum | StNHX1 | Glycine max | Leaves appearance with lower scorch scores and a lower content of Na+ and malondialdehyde | [179] |
Plasma membrane Na+/H+ antiporter system | ||||
Arabidopsis thaliana L. (wild type) | AtSOS1 | Arabidopsis thaliana | Better root growth, increased germination rate, elevated chlorophyll content, and reduced accumulation of Na+ | [180] |
Arabidopsis thaliana | AtSOS1 | Arabidopsis thaliana | Better growth and higher survival rate | [86] |
Arabidopsis thaliana | AtSOS2 | Nicotiana tabacum cv. Xanthi-nc | Superior growth and increased germination rate | [87] |
Gossypium hirsutum | GhSOS1 | Arabidopsis thaliana | Lower MDA content and decreased Na+/K+ ratio | [181] |
Plasma membrane-bound high-affinity potassium transporters | ||||
Arabidopsis thaliana | AtHKT1 | Solanum tuberosum L. | Alleviation of salt-induced damages in potato | [182] |
Populus trichocarpa | PeHKT1;1 | Populus davidiana × Populus bolleana | Better relative growth rate, higher catalase (CAT), peroxidase (POD), and superoxide dismutase (SOD) | [183] |
Glycine max | GmHKT1;4 | Nicotiana tabacum | Greater amount of K+ and less Na+, maintaining a lower Na+/K+ ratio in roots under alkaline and saline conditions | [184] |
Vacuolar H+-pyrophosphatase | ||||
Arabidopsis thaliana | AVP1 | Arabidopsis thaliana | Increased sequestration of solutes into vacuole | [103] |
Arabidopsis thaliana | AVP1 | Arachis hypogaea | Greater biomass and elevated photosynthetic rate | [109] |
Arabidopsis thaliana | AVP1 | Gossypium hirsutum | Improved salt tolerance and greater fiber yield under greenhouse and field conditions | [106,107] |
Arabidopsis thaliana | AVP1 | Hordeum vulgare | Larger biomass and greater grain yield | [110] |
Co-overexpression of genes | ||||
Arabidopsis thaliana | AtNHX1 and SOS1 | Arabidopsis thaliana | Salt tolerance up to 250 mM of NaCl | [85] |
Arabidopsis thaliana | AtNHX1 and Bar gene | Vigna radiata L. Wilczek | Transgenic plants with better ion homeostasis and reduced oxidative stress | [185] |
Arabidopsis thaliana | AtNHX1 and AVP1 | Gossypium hirsutum | Robust growth with a larger root system and greater fiber yield | [105] |
Arabidopsis thaliana and Oryza sativa | AVP1 and OsSIZ1 (SUMO E3 Ligase) | Arabidopsis thaliana (Overexpression) | Increased abiotic stress tolerance including salt stress | [101] |
Arabidopsis thaliana and Larrea tridentata | AVP1 and Rubisco activase gene RCA | Arabidopsis thaliana (Overexpression) | Higher biomass and seed yield | [100] |
Arabidopsis thaliana | Vacuolar H+-pyrophosphatase, catalytic subunit of protein phosphatase 2A, and chloride ion channel protein (AVP1, PP2A-C5 and AtCLCc) | Arabidopsis thaliana (Overexpression) | Robust growth with a greater number of viable seeds | [99] |
Arabidopsis thaliana | Vacuolar H+-pyrophosphatase and catalytic subunit of protein phosphatase 2A (AVP1 and PP2A-C5) | Arabidopsis thaliana (Overexpression) | Enhanced salt tolerance to NaCl, KNO3, and LiCl | [102] |
Other proton pumps | ||||
Spartina alterniflora | Vacuolar H+-ATPase (saVHAc1) | Oryza sativa | Enhanced yield observed under salinity conditions | [186] |
Sesuvium portulacastrum | Plasma membrane H+-ATPase (SpAHA1) | Arabidopsis thaliana | Robust growth with longer roots, greater biomass, and a higher rate of seed germination | [187] |
7. Concluding Remarks and Future Perspectives
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Balasubramaniam, T.; Shen, G.; Esmaeili, N.; Zhang, H. Plants’ Response Mechanisms to Salinity Stress. Plants 2023, 12, 2253. https://doi.org/10.3390/plants12122253
Balasubramaniam T, Shen G, Esmaeili N, Zhang H. Plants’ Response Mechanisms to Salinity Stress. Plants. 2023; 12(12):2253. https://doi.org/10.3390/plants12122253
Chicago/Turabian StyleBalasubramaniam, Thuvaraki, Guoxin Shen, Nardana Esmaeili, and Hong Zhang. 2023. "Plants’ Response Mechanisms to Salinity Stress" Plants 12, no. 12: 2253. https://doi.org/10.3390/plants12122253