caa a22 4500 463171845 CHVBK 20180406164815.0 cr unu---uuuuu 170326e20071201xx s 000 0 eng 10.1007/s00344-007-9021-8 doi (NATIONALLICENCE)springer-10.1007/s00344-007-9021-8 Changes in Growth Pattern, Enzymatic Activities Related to Ascorbate Metabolism, and Hydrogen Peroxide in Onion Roots Growing Under Experimentally Increased Ascorbate Content [Elektronische Daten] [M. del Córdoba-Pedregosa, José Villalba, Francisco Córdoba, José González-Reyes] Onion (Allium cepa L.) roots treated with external ascorbate or with the immediate precursor of its synthesis, L-galactono-γ-lactone, increased root development measured as an increase in fresh and dry weights after 48-h treatments compared to controls. Also, treatments induced changes in extracellular (apoplastic) and cytosolic (symplastic) enzyme activities related to ascorbate metabolism and antioxidant protection, such as ascorbate peroxidase, monodehydroascorbate reductase, dehydroascorbate reductase, glutathione reductase, and catalase. Finally, we have found that both chemicals induced increased content of hydrogen peroxide in well-differentiated zones of the root, and local increases in meristematic and elongation zones were detected by cytochemistry as well. The results are discussed on the basis of changes in the root growth rate and other physiologic processes mediated by ascorbate in higher plants. Springer Science+Business Media, LLC, 2007 Ascorbate nationallicence Hydrogen peroxide nationallicence L-galactono-γ-lactone nationallicence Onion root growth nationallicence Plant development nationallicence del Córdoba-Pedregosa M. Departamento de Biología Celular, Fisiología e Inmunología, Universidad de Córdoba, Campus de Rabanales, Edificio Severo Ochoa, Planta 3, 14014, Córdoba, Spain aut Villalba José Departamento de Biología Celular, Fisiología e Inmunología, Universidad de Córdoba, Campus de Rabanales, Edificio Severo Ochoa, Planta 3, 14014, Córdoba, Spain aut Córdoba Francisco Departamento de Biología Ambiental y Salud Pública, Universidad de Huelva, Huelva, Spain aut González-Reyes José Departamento de Biología Celular, Fisiología e Inmunología, Universidad de Córdoba, Campus de Rabanales, Edificio Severo Ochoa, Planta 3, 14014, Córdoba, Spain aut Journal of Plant Growth Regulation Springer-Verlag 26/4(2007-12-01), 341-350 0721-7595 26:4<341 2007 26 344 https://doi.org/10.1007/s00344-007-9021-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00344-007-9021-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- del Córdoba-Pedregosa M. Departamento de Biología Celular, Fisiología e Inmunología, Universidad de Córdoba, Campus de Rabanales, Edificio Severo Ochoa, Planta 3, 14014, Córdoba, Spain aut NATIONALLICENCE 700 1- Villalba José Departamento de Biología Celular, Fisiología e Inmunología, Universidad de Córdoba, Campus de Rabanales, Edificio Severo Ochoa, Planta 3, 14014, Córdoba, Spain aut NATIONALLICENCE 700 1- Córdoba Francisco Departamento de Biología Ambiental y Salud Pública, Universidad de Huelva, Huelva, Spain aut NATIONALLICENCE 700 1- González-Reyes José Departamento de Biología Celular, Fisiología e Inmunología, Universidad de Córdoba, Campus de Rabanales, Edificio Severo Ochoa, Planta 3, 14014, Córdoba, Spain aut NATIONALLICENCE 773 0- Journal of Plant Growth Regulation Springer-Verlag 26/4(2007-12-01), 341-350 0721-7595 26:4<341 2007 26 344 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer