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Mugnai S, Pandolfi C, Masi E, Azzarello E, Monetti E, Comparini D, Voigt B, Volkmann D, Mancuso S. Oxidative stress and NO signalling in the root apex as an early response to changes in gravity conditions. BIOMED RESEARCH INTERNATIONAL 2014; 2014:834134. [PMID: 25197662 PMCID: PMC4150467 DOI: 10.1155/2014/834134] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/16/2014] [Accepted: 07/16/2014] [Indexed: 01/02/2023]
Abstract
Oxygen influx showed an asymmetry in the transition zone of the root apex when roots were placed horizontally on ground. The influx increased only in the upper side, while no changes were detected in the division and in the elongation zone. Nitric oxide (NO) was also monitored after gravistimulation, revealing a sudden burst only in the transition zone. In order to confirm these results in real microgravity conditions, experiments have been set up by using parabolic flights and drop tower. The production of reactive oxygen species (ROS) was also monitored. Oxygen, NO, and ROS were continuously monitored during normal and hyper- and microgravity conditions in roots of maize seedlings. A distinct signal in oxygen and NO fluxes was clearly detected only in the apex zone during microgravity, with no significant changes in normal and in hypergravity conditions. The same results were obtained by ROS measurement. The detrimental effect of D'orenone, disrupting the polarised auxin transport, on the onset of the oxygen peaks during the microgravity period was also evaluated. Results indicates an active role of NO and ROS as messengers during the gravitropic response, with probable implications in the auxin redistribution.
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Affiliation(s)
- Sergio Mugnai
- DISPAA, University of Florence, Viale delle Idee 30, 50019 Sesto Fiorentino, Italy
- HSO-USB, ESTEC, European Space Agency, Keplerlaan 1, 2200 AG Noordwijk, The Netherlands
| | - Camilla Pandolfi
- DISPAA, University of Florence, Viale delle Idee 30, 50019 Sesto Fiorentino, Italy
| | - Elisa Masi
- DISPAA, University of Florence, Viale delle Idee 30, 50019 Sesto Fiorentino, Italy
| | - Elisa Azzarello
- DISPAA, University of Florence, Viale delle Idee 30, 50019 Sesto Fiorentino, Italy
| | - Emanuela Monetti
- DISPAA, University of Florence, Viale delle Idee 30, 50019 Sesto Fiorentino, Italy
| | - Diego Comparini
- DISPAA, University of Florence, Viale delle Idee 30, 50019 Sesto Fiorentino, Italy
| | - Boris Voigt
- IZMB, University of Bonn, Kirschallee 1, 53115 Bonn, Germany
| | - Dieter Volkmann
- IZMB, University of Bonn, Kirschallee 1, 53115 Bonn, Germany
| | - Stefano Mancuso
- DISPAA, University of Florence, Viale delle Idee 30, 50019 Sesto Fiorentino, Italy
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Corpas FJ, Barroso JB. Peroxisomal plant nitric oxide synthase (NOS) protein is imported by peroxisomal targeting signal type 2 (PTS2) in a process that depends on the cytosolic receptor PEX7 and calmodulin. FEBS Lett 2014; 588:2049-54. [DOI: 10.1016/j.febslet.2014.04.034] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2014] [Revised: 04/18/2014] [Accepted: 04/23/2014] [Indexed: 01/09/2023]
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Corpas FJ, Barroso JB. Functional implications of peroxisomal nitric oxide (NO) in plants. FRONTIERS IN PLANT SCIENCE 2014; 5:97. [PMID: 24672535 PMCID: PMC3956114 DOI: 10.3389/fpls.2014.00097] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2014] [Accepted: 02/27/2014] [Indexed: 05/06/2023]
Affiliation(s)
- Francisco J. Corpas
- Departamento de Bioquímica, Biología Celular y Molecular de Plantas, Estación Experimental del Zaidín, Consejo Superior de Investigaciones CientíficasGranada, Spain
- *Correspondence:
| | - Juan B. Barroso
- Departamento de Bioquímica y Biología Molecular, Facultad de Ciencias Experimentales, Universidad de JaénJaén, Spain
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Bellini C, Pacurar DI, Perrone I. Adventitious roots and lateral roots: similarities and differences. ANNUAL REVIEW OF PLANT BIOLOGY 2014; 65:639-66. [PMID: 24555710 DOI: 10.1146/annurev-arplant-050213-035645] [Citation(s) in RCA: 292] [Impact Index Per Article: 29.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
In addition to its role in water and nutrient uptake, the root system is fundamentally important because it anchors a plant to its substrate. Although a wide variety of root systems exist across different species, all plants have a primary root (derived from an embryonic radicle) and different types of lateral roots. Adventitious roots, by comparison, display the same functions as lateral roots but develop from aerial tissues. In addition, they not only develop as an adaptive response to various stresses, such as wounding or flooding, but also are a key limiting component of vegetative propagation. Lateral and adventitious roots share key elements of the genetic and hormonal regulatory networks but are subject to different regulatory mechanisms. In this review, we discuss the developmental processes that give rise to lateral and adventitious roots and highlight knowledge acquired over the past few years about the mechanisms that regulate adventitious root formation.
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Affiliation(s)
- Catherine Bellini
- Umeå Plant Science Center, Department of Plant Physiology, Umeå University, SE90187 Umeå, Sweden; , ,
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Groß F, Durner J, Gaupels F. Nitric oxide, antioxidants and prooxidants in plant defence responses. FRONTIERS IN PLANT SCIENCE 2013; 4:419. [PMID: 24198820 PMCID: PMC3812536 DOI: 10.3389/fpls.2013.00419] [Citation(s) in RCA: 149] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2013] [Accepted: 10/01/2013] [Indexed: 05/18/2023]
Abstract
In plant cells the free radical nitric oxide (NO) interacts both with anti- as well as prooxidants. This review provides a short survey of the central roles of ascorbate and glutathione-the latter alone or in conjunction with S-nitrosoglutathione reductase-in controlling NO bioavailability. Other major topics include the regulation of antioxidant enzymes by NO and the interplay between NO and reactive oxygen species (ROS). Under stress conditions NO regulates antioxidant enzymes at the level of activity and gene expression, which can cause either enhancement or reduction of the cellular redox status. For instance chronic NO production during salt stress induced the antioxidant system thereby increasing salt tolerance in various plants. In contrast, rapid NO accumulation in response to strong stress stimuli was occasionally linked to inhibition of antioxidant enzymes and a subsequent rise in hydrogen peroxide levels. Moreover, during incompatible Arabidopsis thaliana-Pseudomonas syringae interactions ROS burst and cell death progression were shown to be terminated by S-nitrosylation-triggered inhibition of NADPH oxidases, further highlighting the multiple roles of NO during redox-signaling. In chemical reactions between NO and ROS reactive nitrogen species (RNS) arise with characteristics different from their precursors. Recently, peroxynitrite formed by the reaction of NO with superoxide has attracted much attention. We will describe putative functions of this molecule and other NO derivatives in plant cells. Non-symbiotic hemoglobins (nsHb) were proposed to act in NO degradation. Additionally, like other oxidases nsHb is also capable of catalyzing protein nitration through a nitrite- and hydrogen peroxide-dependent process. The physiological significance of the described findings under abiotic and biotic stress conditions will be discussed with a special emphasis on pathogen-induced programmed cell death (PCD).
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Affiliation(s)
| | | | - Frank Gaupels
- German Research Center for Environmental Health, Institute of Biochemical Plant Pathology, Helmholtz-Zentrum MünchenMunich, Germany
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