Nitric Oxide: Role in Plants Under Abiotic Stress

Bajguz, Andrzej

doi:10.1007/978-1-4614-8600-8_5

Cited by 23 publications

(6 citation statements)

References 162 publications

(143 reference statements)

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“…The reductive pathways that lead to NO production depend on nitrite, which is primarily produced from nitrate by NR 49 . Moreover, NO can be generated non-enzymatically as a by-product of denitrification, fixation of nitrogen and respiration 50 . It is well known that the key enzyme for NO generation in animals is NOS, whereas, the activity of NOS-like enzymes has been detected in plants which catalyzed L-arginine synthesis to NO 51 , 52 .…”

Section: Discussionmentioning

confidence: 99%

Effects of nitric oxide on the GABA, polyamines, and proline in tea (Camellia sinensis) roots under cold stress

Wang

Xiong

Nong

et al. 2020

Sci Rep

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Tea plant often suffers from low temperature induced damage during its growth. How to improve the cold resistance of tea plant is an urgent problem to be solved. Nitric oxide (NO), γ-aminobutyric acid (GABA) and proline have been proved that can improve the cold resistance of tea plants, and signal transfer and biosynthesis link between them may enhance their function. NO is an important gas signal material in plant growth, but our understanding of the effects of NO on the GABA shunt, proline and NO biosynthesis are limited. In this study, the tea roots were treated with a NO donor (SNAP), NO scavenger (PTIO), and NO synthase inhibitor (L-NNA). SNAP could improve activities of arginine decarboxylase, ornithine decarboxylase, glutamate decarboxylase, GABA transaminase and Δ1-pyrroline-5-carboxylate synthetase and the expression level of related genes during the treatments. The contents of putrescine and spermidine under SNAP treatment were 45.3% and 37.3% higher compared to control at 24 h, and the spermine content under PTIO treatment were 57.6% lower compare to control at 12 h. Accumulation of proline of SNAP and L-NNA treatments was 52.2% and 43.2% higher than control at 48 h, indicating other pathway of NO biosynthesis in tea roots. In addition, the NO accelerated the consumption of GABA during cold storage. These facts indicate that NO enhanced the cold tolerance of tea, which might regulate the metabolism of the GABA shunt and of proline, associated with NO biosynthesis. Tea plant is an important economic crop which is widely planted in many regions of China. Adverse environmental conditions, mainly cold stress, impose major limitations on the suitable geographical locations for tea growth and impact both in tea production and quality 1. The GABA is a non-protein amino acid, C 4 H 9 NO 2 3 , and is widely distributed in nature among prokaryotes and eukaryotes as an important free amino acid. Some special treatments of fresh tea leaves, such as charging the nitrogen and removing oxygen can result in accumulation of GABA 2. It is widely known as a neurotransmitter in the sympathetic nervous system 4,5. Moreover, previous study also revealed its function on improving cold tolerance of tea plant 6. There are several GABA metabolism pathways, including glutamate catalyzed by glutamate decarboxylase (GAD) and the reversible conversion of GABA to succinic semialdehyde by GABA transaminase (GABA-T) followed by irreversible oxidization of succinic semialdehyde. Polyamines (PAs) include spermidine (Spd), spermine (Spm) and their diamine obligate precursor putrescine (Put) 3,7 , PAs catabolism can provide raw materials for GABA synthesis which means PAs degradation pathway is an important component of the GABA biosynthesis pathway 8. The Put and Spd are catalyzed by diamine oxidase and polyamine oxidase, respectively 3. PAs are widely present in plants, and the enzymes related to their biosynthesis have strong connections with environmental stresses such as cold, heat, salt and drought stress 9,10. The expression and a...

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Section: Discussionmentioning

confidence: 99%

Effects of nitric oxide on the GABA, polyamines, and proline in tea (Camellia sinensis) roots under cold stress

Wang

Xiong

Nong

et al. 2020

Sci Rep

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“…NO reacts with lipid radicals thus preventing lipid oxidation, exerting a protective effect by scavenging superoxide radical and formation of peroxynitrite that can be neutralised by other cellular processes. It also helps in the activation of antioxidant enzymes (SOD, CAT, GPX, APX, and GR) [ 144 ].…”

Section: Physiological and Biochemical Mechanisms Of Salt Tolerancmentioning

confidence: 99%

Mechanism of Salinity Tolerance in Plants: Physiological, Biochemical, and Molecular Characterization

Gupta

Huang

2014

International Journal of Genomics

1,391

963

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Salinity is a major abiotic stress limiting growth and productivity of plants in many areas of the world due to increasing use of poor quality of water for irrigation and soil salinization. Plant adaptation or tolerance to salinity stress involves complex physiological traits, metabolic pathways, and molecular or gene networks. A comprehensive understanding on how plants respond to salinity stress at different levels and an integrated approach of combining molecular tools with physiological and biochemical techniques are imperative for the development of salt-tolerant varieties of plants in salt-affected areas. Recent research has identified various adaptive responses to salinity stress at molecular, cellular, metabolic, and physiological levels, although mechanisms underlying salinity tolerance are far from being completely understood. This paper provides a comprehensive review of major research advances on biochemical, physiological, and molecular mechanisms regulating plant adaptation and tolerance to salinity stress.

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“…Under stress conditions, NO either directly or indirectly regulates many genes involved in developing tolerance to salinity stress, including various redox-related and antioxidant enzyme genes (e.g. GPX, GR, SOD, CAT, and APX), and suppresses lipid peroxidation or malondialdehyde (MDA), consequently restoring normal plant growth (Bajguz, 2014). NO increases plasma membrane expression and/or tonoplast H + -ATPase and H + -PPase to maintain a high K + /Na + ratio in the cytoplasm in response to salinity (Sung and Hong, 2010; Zhang et al, 2017).…”

Section: Plant Cellular Mechanisms That Improve Tolerance To Salinitymentioning

confidence: 99%

Silicon and Salinity: Crosstalk in Crop-Mediated Stress Tolerance Mechanisms

et al. 2019

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Salinity stress hinders the growth potential and productivity of crop plants by influencing photosynthesis, disturbing the osmotic and ionic concentrations, producing excessive oxidants and radicals, regulating endogenous phytohormonal functions, counteracting essential metabolic pathways, and manipulating the patterns of gene expression. In response, plants adopt counter mechanistic cascades of physio-biochemical and molecular signaling to overcome salinity stress; however, continued exposure can overwhelm the defense system, resulting in cell death and the collapse of essential apparatuses. Improving plant vigor and defense responses can thus increase plant stress tolerance and productivity. Alternatively, the quasi-essential element silicon (Si)—the second-most abundant element in the Earth’s crust—is utilized by plants and applied exogenously to combat salinity stress and improve plant growth by enhancing physiological, metabolomic, and molecular responses. In the present review, we elucidate the potential role of Si in ameliorating salinity stress in crops and the possible mechanisms underlying Si-associated stress tolerance in plants. This review also underlines the need for future research to evaluate the role of Si in salinity stress in plants and the identification of gaps in the understanding of this process as a whole at a broader field level.

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Nitric Oxide: Role in Plants Under Abiotic Stress

Cited by 23 publications

References 162 publications

Effects of nitric oxide on the GABA, polyamines, and proline in tea (Camellia sinensis) roots under cold stress

Effects of nitric oxide on the GABA, polyamines, and proline in tea (Camellia sinensis) roots under cold stress

Mechanism of Salinity Tolerance in Plants: Physiological, Biochemical, and Molecular Characterization

Silicon and Salinity: Crosstalk in Crop-Mediated Stress Tolerance Mechanisms

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