Oxidative Stress and NO Signalling in the Root Apex as an Early Response to Changes in Gravity Conditions

Mugnai, S.; Pandolfi, Camilla; Masi, Elisa; Azzarello, Elisa; Monetti, Emanuela; Comparini, Diego; Voigt, Boris; Volkmann, Dieter; Mancuso, Stefano

doi:10.1155/2014/834134

Cited by 19 publications

(12 citation statements)

References 38 publications

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“…The idea that normal root morphogenesis could, at least in part, depend on ROS homeostasis in the root apex has been already put forward and discussed (Tsukagoshi , , Kagenishi et al ). The involvement of ROS during the gravitropic response has also been proposed by other authors (Mugnai et al ).…”

Section: Discussionsupporting

confidence: 64%

“…The idea that normal root morphogenesis could, at least in part, depend on ROS homeostasis in the root apex has been already put forward and discussed (Tsukagoshi 2012, 2016, Kagenishi et al 2016. The involvement of ROS during the gravitropic response has also been proposed by other authors (Mugnai et al 2014). The expression of two genes previously identified by Trevisan et al (2015), one encoding 6PGDH, the other encoding G6PD, also displayed high responsiveness to nitrate provision, which strongly induced their transcription in all the root portions examined, although more markedly in cells of the TZ (zone 2).…”

Section: Discussionmentioning

confidence: 94%

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Nitrate affects transcriptional regulation of UPBEAT1 and ROS localisation in roots of Zea mays L.

Trevisan

Trentin

Ghisi

et al. 2018

Physiologia Plantarum

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Nitrogen (N) is an indispensable nutrient for crops but its availability in agricultural soils is subject to considerable fluctuation. Plants have developed plastic responses to external N fluctuations in order to optimise their development. The coordinated action of nitric oxide and auxin seems to allow the cells of the root apex transition zone (TZ) of N‐deprived maize to rapidly sense nitrate (NO3−). Preliminary results support the hypothesis that reactive oxygen species (ROS) signalling might also have a role in this pathway, probably through a putative maize orthologue of UPBEAT1 (UPB1). To expand on this hypothesis and better understand the different roles played by different root portions, we investigated the dynamics of ROS production, and the molecular and biochemical regulation of the main components of ROS production and scavenging in tissues of the meristem, transition zone, elongation zone and maturation zone of maize roots. The results suggest that the inverse regulation of ZmUPB1 and ZmPRX112 transcription observed in cells of the TZ in response to nitrogen depletion or NO3− supply affects the balance between superoxide (O2•−) and hydrogen peroxide (H2O2) in the root apex and consequently triggers differential root growth. This explanation is supported by additional results on the overall metabolic and transcriptional regulation of ROS homeostasis.

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Section: Discussionsupporting

confidence: 64%

Section: Discussionmentioning

confidence: 94%

Nitrate affects transcriptional regulation of UPBEAT1 and ROS localisation in roots of Zea mays L.

Trevisan

Trentin

Ghisi

et al. 2018

Physiologia Plantarum

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“…The root apex has been thought to be an active site for phytohormone action (Baluška et al, 2010) and other signals such as nitric oxide, reactive oxygen species, etc. (Mugnai et al, 2014). Phytohormones such as auxin, ethylene, cytokinin, salycilic acid, and abscisic acid, etc.…”

mentioning

confidence: 99%

Jasmonic Acid Enhances Al-Induced Root Growth Inhibition

Yang

et al. 2016

Plant Physiol.

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Phytohormones such as ethylene and auxin are involved in the regulation of the aluminum (Al)-induced root growth inhibition. Although jasmonate (JA) has been reported to play a crucial role in the regulation of root growth and development in response to environmental stresses through interplay with ethylene and auxin, its role in the regulation of root growth response to Al stress is not yet known. In an attempt to elucidate the role of JA, we found that exogenous application of JA enhanced the Al-induced root growth inhibition. Furthermore, phenotype analysis with mutants defective in either JA biosynthesis or signaling suggests that JA is involved in the regulation of Al-induced root growth inhibition. The expression of the JA receptor CORONATINE INSENSITIVE1 (COI1) and the key JA signaling regulator MYC2 was up-regulated in response to Al stress in the root tips. This process together with COI1-mediated Al-induced root growth inhibition under Al stress was controlled by ethylene but not auxin. Transcriptomic analysis revealed that many responsive genes under Al stress were regulated by JA signaling. The differential responsive of microtubule organization-related genes between the wild-type and coi1-2 mutant is consistent with the changed depolymerization of cortical microtubules in coi1 under Al stress. In addition, ALMT-mediated malate exudation and thus Al exclusion from roots in response to Al stress was also regulated by COI1-mediated JA signaling. Together, this study suggests that root growth inhibition is regulated by COI1-mediated JA signaling independent from auxin signaling and provides novel insights into the phytohormone-mediated root growth inhibition in response to Al stress.

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“…As targets of PA generated by phospholipase D in response to gravity are unknown, it is possible that lipids may modulate protein kinase/phosphatase activity regulating rapid PIN transport. In addition, other possible signal transduction events need to be further studied: rapid NO burst in maize root apex, fast proteome changes in Arabidopsis inflorescence, and plastid-associated hydrogen peroxide accumulation and cytosol acidification in pulvini/ root cap cytosol (Clore et al 2008;Fasano et al 2001;Johannes et al 2001;Mugnai et al 2014;Schenck et al 2013).…”

Section: Discussionmentioning

confidence: 99%

Molecular mechanisms of gravity perception and signal transduction in plants

et al. 2015

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Gravity is one of the environmental cues that direct plant growth and development. Recent investigations of different gravity signalling pathways have added complexity to how we think gravity is perceived. Particular cells within specific organs or tissues perceive gravity stimulus. Many downstream signalling events transmit the perceived information into subcellular, biochemical, and genomic responses. They are rapid, non-genomic, regulatory, and cell-specific. The chain of events may pass by signalling lipids, the cytoskeleton, intracellular calcium levels, protein phosphorylation-dependent pathways, proteome changes, membrane transport, vacuolar biogenesis mechanisms, or nuclear events. These events culminate in changes in gene expression and auxin lateral redistribution in gravity response sites. The possible integration of these signalling events with amyloplast movements or with other perception mechanisms is discussed. Further investigation is needed to understand how plants coordinate mechanisms and signals to sense this important physical factor.

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Oxidative Stress and NO Signalling in the Root Apex as an Early Response to Changes in Gravity Conditions

Cited by 19 publications

References 38 publications

Nitrate affects transcriptional regulation of UPBEAT1 and ROS localisation in roots of Zea mays L.

Nitrate affects transcriptional regulation of UPBEAT1 and ROS localisation in roots of Zea mays L.

Jasmonic Acid Enhances Al-Induced Root Growth Inhibition

Molecular mechanisms of gravity perception and signal transduction in plants

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