Phytohormones and Nitric Oxide Interactions During Abiotic Stress Responses

Mioto, Paulo Tamaso; Freschi, Luciano; Mercier, Helenice

doi:10.1007/978-3-319-06710-0_13

Cited by 6 publications

(5 citation statements)

References 59 publications

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“…177 Particularly, cold is considered one of the abiotic stresses with greater efficiency in the activation of NO synthesis. 178 Although the molecular mechanism responsible for the synthesis of NO in plants is still controversial, L-arginine and nitrite are considered the main NO precursors. 179 In mammals, the major pathway of NO production is the NADPH-dependent oxidation of L-arginine to L-citrulline, catalyzed by nitric oxide synthase, although no mammalian gene homologous to this enzyme was found in plants.…”

Section: Resistance and Injury By Coldmentioning

confidence: 99%

Rapid responses of plants to temperature changes

et al. 2017

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Temperature is one of the main environmental factors that affect plant metabolism. Considering that plants are sessile, their survival depends on the efficient activation of resistance responses to thermal stress. In this comprehensive review, we discuss recent work on rapid biochemical and physiological adjustments, herein referred to as those occurring during the first few hours or a few days after the beginning of the change in the ambient temperature. The short-term metabolic modulation after plant exposure to heat and cold, including chilling and freezing, is discussed. Effects on photosynthesis, cell membranes, antioxidant system, production of heat shock proteins and nitric oxide, as well as an overview of signaling events to heat or cold stress are presented. In addition, we also discuss the acclimation process that occurs when the plant acquires resistance to an increase or decrease in temperature, adjusting its homeostasis and steady-state physiology to the new temperatures. Finally, we present studies with tropical plants that aim at elucidating the effects of temperature and the identification of the resilience levels of these plants to the expected climate changes, and which seek the development of techniques for germplasm conservation of endangered species.

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Section: Resistance and Injury By Coldmentioning

confidence: 99%

Rapid responses of plants to temperature changes

et al. 2017

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Section: No and Other Signaling Molecules Under Heat Stressmentioning

confidence: 99%

“…NO signaling under heat stress involves a cross talk with other signaling molecules such as cyclic adenosine diphosphate ribose, mitogen activated protein kinases, Ca 2+ , and phytohormones (Figure 2 ; Mioto et al, 2014 ; Khan M. N. et al, 2015 ; Asgher et al, 2016 ). Although, only few reports explored the link between them under heat stress, action of NO as a downstream component in hormone-mediated pathways appears to be the common factor in thermotolerance (Mioto et al, 2014 ; Asgher et al, 2016 ). A possible role for NO as a downstream component in the auxin signaling pathway has been proposed in a series of plant growth and stress responses (Pagnussat et al, 2002 ; Hu et al, 2005 ; Chen et al, 2010 ; Kolbert et al, 2012 ; Freschi, 2013 ; Asgher et al, 2016 ).…”

Section: No and Other Signaling Molecules Under Heat Stressmentioning

confidence: 99%

Nitric Oxide (NO) in Plant Heat Stress Tolerance: Current Knowledge and Perspectives

Santisree¹,

Adimulam²,

Bhatnagar‐Mathur³

et al. 2017

Front. Plant Sci.

131

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High temperature is one of the biggest abiotic stress challenges for agriculture. While, Nitric oxide (NO) is gaining increasing attention from plant science community due to its involvement in resistance to various plant stress conditions, its implications on heat stress tolerance is still unclear. Several lines of evidence indicate NO as a key signaling molecule in mediating various plant responses such as photosynthesis, oxidative defense, osmolyte accumulation, gene expression, and protein modifications under heat stress. Furthermore, the interactions of NO with other signaling molecules and phytohormones to attain heat tolerance have also been building up in recent years. Nevertheless, deep insights into the functional intermediaries or signal transduction components associated with NO-mediated heat stress signaling are imperative to uncover their involvement in plant hormone induced feed-back regulations, ROS/NO balance, and stress induced gene transcription. Although, progress is underway, much work remains to define the functional relevance of this molecule in plant heat tolerance. This review provides an overview on current status and discuss knowledge gaps in exploiting NO, thereby enhancing our understanding of the role of NO in plant heat tolerance.

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“…In addition to the primary role in N uptake and assimilation, the enzyme nitrate reductase has also been described to possess a nitrite-NO reductase activity that uses nitrite to produce nitric oxide (NO; Astier et al, 2018). This signaling molecule could be involved with stomatal closure in response to plant acclimation to drought (Mioto et al, 2014). Detached leaves of G. monostachia exposed for 7 days to polyethylene glycol showed that NO increased exclusively in the apical part of the leaves and the stomata remained closed even in the night period (CAM-idling mode; Mioto and Mercier, 2013).…”

Section: C3/cam-idling Comparison Through Rna-seqmentioning

confidence: 99%

Transcriptomic and Biochemical Analysis Reveal Integrative Pathways Between Carbon and Nitrogen Metabolism in Guzmania monostachia (Bromeliaceae) Under Drought

Gonçalves

Mercier

2021

Front. Plant Sci.

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Most epiphytes are found in low-nutrient environments with an intermittent water supply. To deal with water limitation, many bromeliads perform crassulacean acid metabolism (CAM), such as Guzmania monostachia, which shifts from C3 to CAM and can recycle CO2 from the respiration while stomata remain closed during daytime and nighttime (CAM-idling mode). Since the absorbing leaf trichomes can be in contact with organic (urea) and inorganic nutrients (NO3−, NH4+) and the urea hydrolysis releases NH4+ and CO2, we hypothesized that urea can integrate the N and C metabolism during periods of severe drought. Under this condition, NH4+ can be assimilated into amino acids through glutamine synthetase (GS), while the CO2 can be pre-fixated by phosphoenolpyruvate carboxylase (PEPC). In this context, we evaluated the foliar transcriptome of G. monostachia to compare the relative gene expression of some genes involved with CAM and the N metabolism when bromeliads were submitted to 7days of drought. We also conducted a controlled experiment with an extended water deficit period (21days) in which bromeliads were cultivated in different N sources (urea, NH4+, and NO3−). Our transcriptome results demonstrated an increment in the expression of genes related to CAM, particularly those involved in the carboxylation metabolism (PEPC1, PPCK, and NAD-MDH), the movement of malate through vacuolar membrane (ALMT9), and the decarboxylation process (PEPCK). Urea stimulated the expression of PEPC1 and ALMT9, while Urease transcripts increased under water deficit. Under this same condition, GS1 gene expression increased, indicating that the NH4+ from urea hydrolysis can be assimilated in the cytosol. We suggest that the link between C and N metabolism occurred through the supply of carbon skeleton (2-oxoglutarate, 2-OG) by the cytosolic isocitrate dehydrogenase since the number of NADP-ICDH transcripts was also higher under drought conditions. These findings indicate that while urea hydrolysis provides NH4+ that can be consumed by glutamine synthetase-cytosolic/glutamate synthase (GS1/GOGAT) cycle, the CO2 can be used by CAM, maintaining photosynthetic efficiency even when most stomata remain closed 24h (CAM-idling) as in the case of a severe water deficit condition. Thus, we suggest that urea could be used by G. monostachia as a strategy to increase its survival under drought, integrating N and C metabolism.

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Phytohormones and Nitric Oxide Interactions During Abiotic Stress Responses

Cited by 6 publications

References 59 publications

Rapid responses of plants to temperature changes

Rapid responses of plants to temperature changes

Nitric Oxide (NO) in Plant Heat Stress Tolerance: Current Knowledge and Perspectives

Transcriptomic and Biochemical Analysis Reveal Integrative Pathways Between Carbon and Nitrogen Metabolism in Guzmania monostachia (Bromeliaceae) Under Drought

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