The effect of plant cytokinin hormones on the production of ethylene, nitric oxide, and protein nitrotyrosine in ageing tobacco leaves

Wilhelmová, N.; Fuksová, H.; Srbová, Martina; Miková, Dana; Mýtinová, Z.; Procházková, Dagmar; Vytášek, Richard; Wilhelm, J.

doi:10.1002/biof.5520270118

Cited by 31 publications

(15 citation statements)

References 26 publications

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“…Presumably, CKs activate plasma membrane H1-ATPase through decreasing NO levels in guard cells, and then stimulate stomatal opening in darkness. Wilhelmova et al [44] reported similar results in transgenic tobacco plants. Negative interaction between NO and CKs was evident during leaf development as increased NO production reduced CKs level in aging leaves.…”

Section: No-phytohormone Cross Talk Under Drought Stressmentioning

confidence: 60%

Cross Talk between Nitric Oxide and Phytohormones Regulate Plant Development during Abiotic Stresses

Nawaz¹,

Shabbir²,

Shahbaz³

et al. 2017

Phytohormones - Signaling Mechanisms and Crosstalk in Plant Development and Stress Responses

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Plants, being sessile, are concurrently exposed to various biotic and abiotic stresses. The perception of stress signals in plants involves a wide spectrum of signal transduction pathways that interact to induce tolerance against adverse environmental conditions. This functional overlapping among various stress signaling cascades also leads to the expression of genes that regulate biosynthesis or action of other hormones. Phytohormonal signals, activated by both developmental and environmental responses, play a crucial role to develop stress tolerance in plants. Nitric oxide (NO) is one of the major players in plant signaling networks. Emerging evidence supports that NO interplays with signaling pathways of auxins, gibberellins, abscisic acid, ethylene, jasmonic acid, brassinosteroids, and other plant hormones to control metabolism, growth, and development in plants. This chapter focuses on the current state of knowledge of cross talk between signaling pathways of NO and phytohormones in plants exposed to various abiotic stresses.

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Section: No-phytohormone Cross Talk Under Drought Stressmentioning

confidence: 60%

Cross Talk between Nitric Oxide and Phytohormones Regulate Plant Development during Abiotic Stresses

Nawaz¹,

Shabbir²,

Shahbaz³

et al. 2017

Phytohormones - Signaling Mechanisms and Crosstalk in Plant Development and Stress Responses

View full text Add to dashboard Cite

show abstract

“…3 A and B). In addition, Wilhelmova et al (44) also found a negative correlation between cytokinin levels and NO production using transgenic tobacco plants with genetically increased or decreased levels of cytokinins. Clearly, the observations from the experiments applying exogenous NO or cytokinins are inconsistent with the results obtained using mutants or transgenic plants with altered NO or cytokinin levels.…”

Section: Discussionmentioning

confidence: 97%

Cytokinins can act as suppressors of nitric oxide in Arabidopsis

Liu

Kong

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

112

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Maintaining nitric oxide (NO) homeostasis is essential for normal plant physiological processes. However, very little is known about the mechanisms of NO modulation in plants. Here, we report a unique mechanism for the catabolism of NO based on the reaction with the plant hormone cytokinin. We screened for NO-insensitive mutants in Arabidopsis and isolated two allelic lines, cnu1-1 and 1-2 (continuous NO-unstressed 1), that were identified as the previously reported altered meristem program 1 (amp1) and as having elevated levels of cytokinins. A double mutant of cnu1-2 and nitric oxide overexpression 1 (nox1) reduced the severity of the phenotypes ascribed to excess NO levels as did treating the nox1 line with trans-zeatin, the predominant form of cytokinin in Arabidopsis. We further showed that peroxinitrite, an active NO derivative, can react with zeatin in vitro, which together with the results in vivo suggests that cytokinins suppress the action of NO most likely through direct interaction between them, leading to the reduction of endogenous NO levels. These results provide insights into NO signaling and regulation of its bioactivity in plants.is one of the most widespread signaling molecules in living organisms (1, 2). In plants, NO is involved in the regulation of numerous physiological processes during growth and development and is also an important modulator of disease resistance (2-4). Several laboratories discovered that NO is produced not only from nitrate/nitrite but also from L-arginine (L-Arg), which is the main substrate for NO synthesis in animals (4-6). NO is also a widespread atmospheric pollutant. Therefore, this gas not only is a pivotal player in signal transduction but also has the potential to exert significant deleterious effects by being a pollutant. As an inevitable result, increased NO levels in the atmosphere can influence multiple NO-regulated processes in organisms. Despite the wealth of information gathered from analyses of NO functioning in plants, the molecular processes underlying NO effects in plants are still largely unknown.NO differs from other signaling molecules by being reactive, lipophilic, and volatile. In fact, chemically, NO is a free radical, and such a reactive molecule is unlikely to interact specifically with a single specific receptor (3). In animals, NO appears to act through the chemical modification of targets. NO can bind to transition metals of metalloproteins (metal nitrosylation). It also can bind covalently to cysteine (S-nitrosylation) and tyrosine (tyrosine nitration) residues (3,7,8). Such specific protein modifications are emerging as key mechanistic intermediates for NO signal transduction. In plant cells, NO has also been found to regulate the activity of various target proteins through S-or metal-nitrosylation and probably through tyrosine nitration as well (9-13).Furthermore, it has been shown that NO takes part in different phytohormone signaling pathways, frequently under the control of hormonal stimuli. For instance, NO functions in auxin-induc...

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“…2). 50 NO interacts with various stress responsive signal networks, chiefly salicylic acid (SA), jasmonic acid (JA), ethylene and the coordination of secondary signal molecules such as cADP ribose, cGMP and Ca…”

Section: Interplay Of No With Phytohormonesmentioning

confidence: 99%