Abstract
Nitric oxide (NO), a non-charged, small, gaseous free-radical, is a signaling molecule in all plant cells. Several studies have proposed multifarious physiological roles for NO, from seed germination to plant maturation and senescence. Nitric oxide is thought to act as an antioxidant, quenching ROS during oxidative stress and reducing lipid peroxidation. NO also mediates photosynthesis and stomatal conductance and regulates programmed cell death, thus providing tolerance to abiotic stress. In mitochondria, NO participates in the electron transport pathway. Nitric oxide synthase and nitrate reductase are the key enzymes involved in NO-biosynthesis in aerobic plants, but non-enzymatic pathways have been reported as well. Nitric oxide can interact with a broad range of molecules, leading to the modification of protein activity, GSH biosynthesis, S-nitrosylation, peroxynitrite formation, proline accumulation, etc., to sustain stress tolerance. In addition to these interactions, NO interacts with fatty acids to form nitro-fatty acids as signals for antioxidant defense. Polyamines and NO interact positively to increase polyamine content and activity. A large number of genes are reprogrammed by NO; among these genes, proline metabolism genes are upregulated. Exogenous NO application is also shown to be involved in salinity tolerance and/or resistance via growth promotion, reversing oxidative damage and maintaining ion homeostasis. This review highlights NO-mediated salinity-stress tolerance in plants, including NO biosynthesis, regulation, and signaling. Nitric oxide-mediated ROS metabolism, antioxidant defense, and gene expression and the interactions of NO with other bioactive molecules are also discussed. We conclude the review with a discussion of unsolved issues and suggestions for future research.
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Abbreviations
- ABA:
-
Abscisic acid
- APX:
-
Ascorbate peroxidase
- AsA:
-
Ascorbate
- ATP:
-
Adenosine triphosphate
- CAT:
-
Catalase
- chl:
-
Chlorophyll
- DHAR:
-
Dehydroascorbate reductase
- ETH:
-
Ethylene
- GPX:
-
Glutathione peroxidase
- GSH:
-
Glutathione
- GR:
-
Glutathione reductase
- GSNO:
-
S-Nitrosoglutathione
- GSNOR:
-
GSNO reductase
- GST:
-
Glutathione S-transferase
- H2S:
-
Hydrogen sulfide
- MAPK:
-
Mitogen-activated protein kinase
- MDA:
-
Malondialdehyde
- MDHAR:
-
Monodehydroascorbate reductase
- MG:
-
Methylglyoxal
- NO2-FAs:
-
Nitro-fatty acids
- NO:
-
Nitric oxide
- NOS:
-
NO synthase
- NR:
-
Nitrate reductase
- PA:
-
Polyamine
- PCD:
-
Programmed cell death
- PM:
-
Plasma membrane
- POD:
-
Guiacol peroxidase
- PTM:
-
Post-translational modification
- ROS:
-
Reactive oxygen species
- RNS:
-
Reactive nitrogen species
- RuBisCO:
-
Ribulose-1,5-bisphosphate carboxylase/oxygenase
- SNAP:
-
S-Nitroso-N-acetylpenicillamine
- SNP:
-
Sodium nitroprusside
- SOD:
-
Superoxide dismutase
- XOR:
-
Xanthine oxidoreductase
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We thank Ms. Khursheda Parvin and Abdul Awal Chowdhury Masud for their critical reading of the manuscript. The first author acknowledges Japan Society for the Promotion of Sciences (JSPS) for providing research grants.
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Hasanuzzaman, M., Oku, H., Nahar, K. et al. Nitric oxide-induced salt stress tolerance in plants: ROS metabolism, signaling, and molecular interactions. Plant Biotechnol Rep 12, 77–92 (2018). https://doi.org/10.1007/s11816-018-0480-0
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DOI: https://doi.org/10.1007/s11816-018-0480-0