Plant Nitric Oxide Signaling under Drought Stress

Water deficit caused by drought is a significant threat to crop growth and production. Nitric oxide (NO), a water- and lipid-soluble free radical, plays an important role in cytoprotection. Apart from a few studies supporting the role of NO in drought responses, little is known about this pivotal molecular amendment in the regulation of abiotic stress signaling. In this review, we highlight the knowledge gaps in NO roles under drought stress and the technical challenges underlying NO detection and measurements, and we provide recommendations regarding potential avenues for future investigation. The modulation of NO production to alleviate abiotic stress disturbances in higher plants highlights the potential of genetic manipulation to influence NO metabolism as a tool with which plant fitness can be improved under adverse growth conditions.

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Nitric Oxide Overproduction by cue1 Mutants Differs on Developmental Stages and Growth Conditions

Plants ◽

10.3390/plants9111484 ◽

2020 ◽

Vol 9 (11) ◽

pp. 1484 ◽

Cited By ~ 1

Author(s):

Tamara Lechón ◽

Luis Sanz ◽

Inmaculada Sánchez-Vicente ◽

Oscar Lorenzo

Keyword(s):

Nitric Oxide ◽

Carbon Metabolism ◽

Root Elongation ◽

Developmental Stages ◽

Primary Root ◽

Carbon Sources ◽

Growth Conditions ◽

No Production

The cue1 nitric oxide (NO) overproducer mutants are impaired in a plastid phosphoenolpyruvate/phosphate translocator, mainly expressed in Arabidopsis thaliana roots. cue1 mutants present an increased content of arginine, a precursor of NO in oxidative synthesis processes. However, the pathways of plant NO biosynthesis and signaling have not yet been fully characterized, and the role of CUE1 in these processes is not clear. Here, in an attempt to advance our knowledge regarding NO homeostasis, we performed a deep characterization of the NO production of four different cue1 alleles (cue1-1, cue1-5, cue1-6 and nox1) during seed germination, primary root elongation, and salt stress resistance. Furthermore, we analyzed the production of NO in different carbon sources to improve our understanding of the interplay between carbon metabolism and NO homeostasis. After in vivo NO imaging and spectrofluorometric quantification of the endogenous NO levels of cue1 mutants, we demonstrate that CUE1 does not directly contribute to the rapid NO synthesis during seed imbibition. Although cue1 mutants do not overproduce NO during germination and early plant development, they are able to accumulate NO after the seedling is completely established. Thus, CUE1 regulates NO homeostasis during post-germinative growth to modulate root development in response to carbon metabolism, as different sugars modify root elongation and meristem organization in cue1 mutants. Therefore, cue1 mutants are a useful tool to study the physiological effects of NO in post-germinative growth.

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The Signaling Pathways in Nitric Oxide Production by Neutrophils Exposed to N-nitrosodimethylamine

Letters in Drug Design & Discovery ◽

10.2174/1570180815666180426121503 ◽

2018 ◽

Vol 16 (2) ◽

pp. 194-199

Author(s):

Wioletta Ratajczak-Wrona ◽

Ewa Jablonska

Keyword(s):

Nitric Oxide ◽

Signaling Pathways ◽

Molecular Mechanisms ◽

Polymorphonuclear Neutrophils ◽

Microbial Pathogens ◽

Human Neutrophils ◽

No Production ◽

Oxide Synthase ◽

Inducible Nitric Oxide

Background: Polymorphonuclear neutrophils (PMNs) play a crucial role in the innate immune system’s response to microbial pathogens through the release of reactive nitrogen species, including Nitric Oxide (NO). </P><P> Methods: In neutrophils, NO is produced by the inducible Nitric Oxide Synthase (iNOS), which is regulated by various signaling pathways and transcription factors. N-nitrosodimethylamine (NDMA), a potential human carcinogen, affects immune cells. NDMA plays a major part in the growing incidence of cancers. Thanks to the increasing knowledge on the toxicological role of NDMA, the environmental factors that condition the exposure to this compound, especially its precursors- nitrates arouse wide concern. Results: In this article, we present a detailed summary of the molecular mechanisms of NDMA’s effect on the iNOS-dependent NO production in human neutrophils. Conclusion: This research contributes to a more complete understanding of the mechanisms that explain the changes that occur during nonspecific cellular responses to NDMA toxicity.

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Role of β-Adrenergic Receptors and Nitric Oxide Signaling in Exercise-Mediated Cardioprotection

Physiology ◽

10.1152/physiol.00011.2013 ◽

2013 ◽

Vol 28 (4) ◽

pp. 216-224 ◽

Cited By ~ 21

Author(s):

John W. Calvert ◽

David J. Lefer

Keyword(s):

Nitric Oxide ◽

Risk Factors ◽

Adrenergic Receptors ◽

Ischemia Reperfusion Injury ◽

Ischemia Reperfusion ◽

Nitric Oxide Signaling ◽

Factors Associated ◽

Cardioprotective Effects ◽

Β Adrenergic Receptors

Exercise promotes cardioprotection in both humans and animals not only by reducing risk factors associated with cardiovascular disease but by reducing myocardial infarction and improving survival following ischemia. This article will define the role that nitric oxide and β-adrenergic receptors play in mediating the cardioprotective effects of exercise in the setting of ischemia-reperfusion injury.

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Disruption of renal peritubular blood flow in lipopolysaccharide-induced renal failure: role of nitric oxide and caspases

AJP Renal Physiology ◽

10.1152/ajprenal.00124.2005 ◽

2005 ◽

Vol 289 (6) ◽

pp. F1324-F1332 ◽

Cited By ~ 82

Author(s):

Manish M. Tiwari ◽

Robert W. Brock ◽

Judit K. Megyesi ◽

Gur P. Kaushal ◽

Philip R. Mayeux

Keyword(s):

Nitric Oxide ◽

Renal Failure ◽

Blood Flow ◽

Saline Group ◽

No Production ◽

Capillary Perfusion ◽

Peritubular Capillary ◽

Synthase Inhibitor ◽

Peritubular Capillary Perfusion

Acute renal failure (ARF) is a frequent and serious complication of endotoxemia caused by lipopolysaccharide (LPS) and contributes significantly to mortality. The present studies were undertaken to examine the roles of nitric oxide (NO) and caspase activation on renal peritubular blood flow and apoptosis in a murine model of LPS-induced ARF. Male C57BL/6 mice treated with LPS ( Escherichia coli) at a dose of 10 mg/kg developed ARF at 18 h. Renal failure was associated with a significant decrease in peritubular capillary perfusion. Vessels with no flow increased from 7 ± 3% in the saline group to 30 ± 4% in the LPS group ( P < 0.01). Both the inducible NO synthase inhibitor l- N6-1-iminoethyl-lysine (l-NIL) and the nonselective caspase inhibitor benzyloxycarbonyl-Val-Ala-Asp fluoromethylketone (Z-VAD) prevented renal failure and reversed perfusion deficits. Renal failure was also associated with an increase in renal caspase-3 activity and an increase in renal apoptosis. Both l-NIL and Z-VAD prevented these changes. LPS caused an increase in NO production that was blocked by l-NIL but not by Z-VAD. Taken together, these data suggest NO-mediated activation of renal caspases and the resulting disruption in peritubular blood flow are an important mechanism of LPS-induced ARF.

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Role of Nitric Oxide Dependence on Nitric Oxide Synthase-like Activity in the Water Stress Signaling of Maize Seedling

Journal of Integrative Plant Biology ◽

10.1111/j.1744-7909.2008.00637.x ◽

2008 ◽

Vol 50 (4) ◽

pp. 435-442 ◽

Cited By ~ 60

Author(s):

Gang-Ping Hao ◽

Yu Xing ◽

Jian-Hua Zhang

Keyword(s):

Nitric Oxide ◽

Water Stress ◽

Nitric Oxide Synthase ◽

Maize Seedling ◽

Stress Signaling ◽

Oxide Synthase

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Nitrate reductases and hemoglobins control nitrogen-fixing symbiosis by regulating nitric oxide accumulation

Journal of Experimental Botany ◽

10.1093/jxb/eraa403 ◽

2020 ◽

Author(s):

Antoine Berger ◽

Alexandre Boscari ◽

Alain Puppo ◽

Renaud Brouquisse

Keyword(s):

Nitric Oxide ◽

Defense Responses ◽

Nodule Formation ◽

No Production ◽

Degradation Pathways ◽

Atmospheric Nitrogen ◽

Metabolic Intermediate ◽

Hypoxic Environment ◽

Nitrate Reductases

Abstract The interaction between legumes and rhizobia leads to the establishment of a symbiotic relationship between plant and bacteria. This is characterized by the formation of a new organ, the nodule, which facilitates the fixation of atmospheric nitrogen (N2) by nitrogenase through the creation of a hypoxic environment. Nitric oxide (NO) accumulates at each stage of the symbiotic process. NO is involved in defense responses, nodule organogenesis and development, nitrogen fixation metabolism, and senescence induction. During symbiosis, either successively or simultaneously, NO regulates gene expression, modulates enzyme activities, and acts as a metabolic intermediate in energy regeneration processes via phytoglobin-NO respiration and the bacterial denitrification pathway. Due to the transition from normoxia to hypoxia during nodule formation, and the progressive presence of the bacterial partner in the growing nodules, NO production and degradation pathways change during the symbiotic process. This review analyzes the different source and degradation pathways of NO, and highlights the role of nitrate reductases and hemoproteins of both the plant and bacterial partners in the control of NO accumulation.

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Recent insights into nitrite signaling processes in blood

Biological Chemistry ◽

10.1515/hsz-2016-0263 ◽

2017 ◽

Vol 398 (3) ◽

pp. 319-329 ◽

Cited By ~ 9

Author(s):

Christine C. Helms ◽

Xiaohua Liu ◽

Daniel B. Kim-Shapiro

Keyword(s):

Nitric Oxide ◽

Human Physiology ◽

Blood Cell ◽

Red Blood Cell ◽

Nitrite Reduction ◽

No Production ◽

The Past ◽

Acidic Conditions ◽

Hypoxic Vasodilation

Abstract Nitrite was once thought to be inert in human physiology. However, research over the past few decades has established a link between nitrite and the production of nitric oxide (NO) that is potentiated under hypoxic and acidic conditions. Under this new role nitrite acts as a storage pool for bioavailable NO. The NO so produced is likely to play important roles in decreasing platelet activation, contributing to hypoxic vasodilation and minimizing blood-cell adhesion to endothelial cells. Researchers have proposed multiple mechanisms for nitrite reduction in the blood. However, NO production in blood must somehow overcome rapid scavenging by hemoglobin in order to be effective. Here we review the role of red blood cell hemoglobin in the reduction of nitrite and present recent research into mechanisms that may allow nitric oxide and other reactive nitrogen signaling species to escape the red blood cell.

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