Plant responses to stresses: Role of ascorbate peroxidase in the antioxidant protection

By A. Caverzan, G. Passaia, S. Rosa, C. Ribeiro, F. Lazzarotto, M. Margis-Pinheiro. Genetics and Molecular Biology, 2012

701 citations recorded by the source corpus.

When plants are exposed to stressful environmental conditions, the production of Reactive Oxygen Species (ROS) increases and can cause significant damage to the cells. Antioxidant defenses, which can detoxify ROS, are present in plants. A major hydrogen peroxide detoxifying system in plant cells is the ascorbate-glutathione cycle, in which, ascorbate peroxidase (APX) enzymes play a key role catalyzing the conversion of H2O2 into H2O, using ascorbate as a specific electron donor. Different APX isoforms are present in distinct subcellular compartments, such as chloroplasts, mitochondria, peroxisome, and cytosol. The expression of APX genes is regulated in response to biotic and abiotic stresses as well as during plant development. The APX responses are directly involved in the protection of plant cells against adverse environmental conditions. Furthermore, mutant plants APX genes showed alterations in growth, physiology and antioxidant metabolism revealing those enzymes involvement in the normal plant development.

Subfields: Plant Science

View Paper: https://www.semanticscholar.org/paper/94251f87f519e9796597548fde4469aa9e7b6eee

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In Plant Science

1. N. Akram
2. M. Ashraf
3. F. Shafiq
4. James R. Smith
5. Felix B. Fritschi
6. J. Gillman
7. A. Casassola
8. P. Sharma

Citations in the corpus

• Ascorbic Acid-A Potential Oxidant Scavenger and Its Role in Plant Development and Abiotic Stress Tolerance (2017, background): “, 2014) and this effect is differentially modulated among plants depending upon the nature, duration and intensity of a stress and plant type (Caverzan et al., 2012).”
• Reactive Oxygen Species and Antioxidant Enzymes Involved in Plant Tolerance to Stress (2016, background): “The APX genes are differentially modulated by several abiotic stresses in plants [26, 27, 28].”
• Impact of heat stress during seed development on soybean seed metabolome (2016, background): “The role of ascorbate/ascorbate peroxidases in heat tolerance is well known (Caverzan et al. 2012).”
• Effect of copper oxide nanoparticles on growth, morphology, photosynthesis, and antioxidant response in Oryza sativa (2016, background): “+Corresponding author; phone: 0832 6519346, fax: 0832 2451184, e-mail: prabhat_k_sharma@rediffmail.com Abbreviations: AAS – atomic absorption spectrophotometer; APX – ascorbate peroxidase; DM – dry mass; E – transpiration rate; FM – fresh mass; Fm – maximum fluorescence; Fo – initial fluorescence; F”
• PlantPAN 2.0: an update of plant promoter analysis navigator for reconstructing transcriptional regulatory networks in plants (2015, background): “…the conversion of H 2 O 2 into H 2 O. Previous studies suggest that APX2 may act as heat-responsive gene that protects the cytosol and other cellular compartments from pho-tooxidative damage during heat stress due to activation by heat stress transcription factors A2 (HSFA2; AT2G26150) (31,32).”
• Recent Developments in Enzymatic Antioxidant Defence Mechanism in Plants with Special Reference to Abiotic Stress (2021, background): “of H2O2 as well as sensors of redox alteration inside plant cells [140], and is considered a”