AtNOA1 modulates nitric oxide accumulation and stomatal closure induced by salicylic acid in Arabidopsis

Sun, Li Rong; Hao, Fu Shun; Lu, Bao Shi; Li, Ya

doi:10.4161/psb.5.8.12293

Cited by 39 publications

(13 citation statements)

References 16 publications

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“…To investigate whether the activation is due to NO produced via the NR or AtNOA1 pathways, we studied Cd 2+ -dependent SnRK2 activation in hydroponically grown seedlings of nia1nia2 (double knockout mutant of NR) and atnoa1 Arabidopsis T-DNA insertion mutants. The atnoa1 and nia1nia2 mutants had previously been shown to produce less NO in response to several biotic as well as abiotic stresses (Besson-Bard et al, 2008;Zhao et al, 2009;Hao et al, 2010;Lozano-Juste and León, 2010;Sun et al, 2010;Xuan et al, 2010). In both nia1nia2 and atnoa1 seedlings, we observed activation of SnRK2(s) in response to CdCl 2 treatment (Fig.…”

Section: Ntosak Undergoes Activation In Tobacco Cells In Response To mentioning

confidence: 52%

SNF1-Related Protein Kinases Type 2 Are Involved in Plant Responses to Cadmium Stress

et al. 2012

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Cadmium ions are notorious environmental pollutants. To adapt to cadmium-induced deleterious effects plants have developed sophisticated defense mechanisms. However, the signaling pathways underlying the plant response to cadmium are still elusive. Our data demonstrate that SnRK2s (for SNF1-related protein kinase2) are transiently activated during cadmium exposure and are involved in the regulation of plant response to this stress. Analysis of tobacco (Nicotiana tabacum) Osmotic StressActivated Protein Kinase activity in tobacco Bright Yellow 2 cells indicates that reactive oxygen species (ROS) and nitric oxide, produced mainly via an L-arginine-dependent process, contribute to the kinase activation in response to cadmium. SnRK2.4 is the closest homolog of tobacco Osmotic Stress-Activated Protein Kinase in Arabidopsis (Arabidopsis thaliana). Comparative analysis of seedling growth of snrk2.4 knockout mutants versus wild-type Arabidopsis suggests that SnRK2.4 is involved in the inhibition of root growth triggered by cadmium; the mutants were more tolerant to the stress. Measurements of the level of three major species of phytochelatins (PCs) in roots of plants exposed to Cd 2+ showed a similar (PC2, PC4) or lower (PC3) concentration in snrk2.4 mutants in comparison to wild-type plants. These results indicate that the enhanced tolerance of the mutants does not result from a difference in the PCs level. Additionally, we have analyzed ROS accumulation in roots subjected to Cd 2+ treatment. Our data show significantly lower Cd 2+ -induced ROS accumulation in the mutants' roots. Concluding, the obtained results indicate that SnRK2s play a role in the regulation of plant tolerance to cadmium, most probably by controlling ROS accumulation triggered by cadmium ions.Cadmium is one of the most toxic soil pollutants. Cadmium ions accumulate in plants and affect, via the food chain, animal and human health. In plants, cadmium is taken up by roots and is transported to aerial organs, leading to chromosomal aberrations, growth reduction, and inhibition of photosynthesis, transpiration, nitrogen metabolism, nutrient and water uptake, eventually causing plant death (for review, see DalCorso et al., 2008). Plants are challenged not only by cadmium ions themselves, but also by Cd 2+ -induced harmful effects including oxidative stress (Schützendübel et al., 2001;Olmos et al., 2003;Cho and Seo, 2005;Sharma and Dietz, 2009). The extent of the detrimental effects on plant growth and metabolism depends on the level of cadmium ions present in the surrounding environment and on the plant's sensitivity to heavy metal stress.Tolerant plants avoid heavy metal uptake and/or induce the expression of genes encoding products involved, directly or indirectly, in heavy metal binding and removal from potentially sensitive sites, by sequestration or efflux (Clemens, 2006). The best-characterized heavy metal binding ligands in plants are thiol-containing compounds metallothioneins and phytochelatins (PCs), whose production is stimulated by Cd 2+. PC...

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Section: Ntosak Undergoes Activation In Tobacco Cells In Response To mentioning

confidence: 52%

SNF1-Related Protein Kinases Type 2 Are Involved in Plant Responses to Cadmium Stress

et al. 2012

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“…In some cases, lag phases compatible with changes in the transcripts level or protein abundance of NO-synthesizing or removal enzymes have been reported (Pagnussat et al, 2002; Freschi et al, 2010). However, under some particular circumstances, the lag phase observed between the application of plant hormones and the rise in NO endogenous levels has been shown to be of just few minutes (Tun et al, 2001; Garcia-Mata and Lamattina, 2002; Huang et al, 2004; Tun et al, 2006; Sun et al, 2010), which indicates that the post-translational regulation of proteins involved in NO metabolism rather than their de novo synthesis might sometimes be implicated.…”

Section: No–phytohormone Interactions: General Mechanisms and Implicamentioning

confidence: 99%

Nitric oxide and phytohormone interactions: current status and perspectives

2013

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Nitric oxide (NO) is currently considered a ubiquitous signal in plant systems, playing significant roles in a wide range of responses to environmental and endogenous cues. During the signaling events leading to these plant responses, NO frequently interacts with plant hormones and other endogenous molecules, at times originating remarkably complex signaling cascades. Accumulating evidence indicates that virtually all major classes of plant hormones may influence, at least to some degree, the endogenous levels of NO. In addition, studies conducted during the induction of diverse plant responses have demonstrated that NO may also affect biosynthesis, catabolism/conjugation, transport, perception, and/or transduction of different phytohormones, such as auxins, gibberellins, cytokinins, abscisic acid, ethylene, salicylic acid, jasmonates, and brassinosteroids. Although still not completely elucidated, the mechanisms underlying the interaction between NO and plant hormones have recently been investigated in a number of species and plant responses. This review specifically focuses on the current knowledge of the mechanisms implicated in NO–phytohormone interactions during the regulation of developmental and metabolic plant events. The modifications triggered by NO on the transcription of genes encoding biosynthetic/degradative enzymes as well as proteins involved in the transport and signal transduction of distinct plant hormones will be contextualized during the control of developmental, metabolic, and defense responses in plants. Moreover, the direct post-translational modification of phytohormone biosynthetic enzymes and receptors through S-nitrosylation will also be discussed as a key mechanism for regulating plant physiological responses. Finally, some future perspectives toward a more complete understanding of NO–phytohormone interactions will also be presented and discussed.

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“…An extensive overview of hormone interactions in stomatal function was given by Acharya and Assmann (2009). Brassinosteriods (BRs), salicylic acid (SA), and jasmonic acid (JA) trigger stomatal closure (Mori et al , 2001; Haubrick et al , 2006; Gonugunta et al , 2009; Ashraf et al , 2010; Sun et al , 2010; Hossain et al , 2011; Khokon et al , 2011; Munemasa et al , 2011), while promotion of stomatal opening has been reported for auxin and cytokinin (Song et al , 2006; Tanaka et al , 2006). Application of BRs induces water stress tolerance in many plant species by closing stomata (Acharya and Assmann, 2009).…”

Section: Is There a Role For Other Phytohormones In The Malfunctioninmentioning

confidence: 99%

Can prolonged exposure to low VPD disturb the ABA signalling in stomatal guard cells?

Aliniaeifard

Meeteren

2013

Journal of Experimental Botany

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The response of stomata to many environmental factors is well documented. Multiple signalling pathways for abscisic acid (ABA)-induced stomatal closure have been proposed over the last decades. However, it seems that exposure of a leaf for a long time (several days) to some environmental conditions generates a sort of memory in the guard cells that results in the loss of suitable responses of the stomata to closing stimuli, such as desiccation and ABA. In this review paper we discuss changes in the normal pattern of signal transduction that could account for disruption of guard cell signalling after long-term exposure to some environmental conditions, with special emphasis on long-term low vapour pressure deficit (VPD).

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AtNOA1 modulates nitric oxide accumulation and stomatal closure induced by salicylic acid in Arabidopsis

Abstract: Addendum to: Hao FS, Zhao SL, Dong H, Zhang H, Sun LR, Miao C. Nia1 and Nia2 are involved in exogenous salicylic acid-induced nitric oxide generation and stomatal closure in Arabidopsis.

Cited by 39 publications

References 16 publications

SNF1-Related Protein Kinases Type 2 Are Involved in Plant Responses to Cadmium Stress

SNF1-Related Protein Kinases Type 2 Are Involved in Plant Responses to Cadmium Stress

Nitric oxide and phytohormone interactions: current status and perspectives

Can prolonged exposure to low VPD disturb the ABA signalling in stomatal guard cells?

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