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. 2020 May 14;11:485. doi: 10.3389/fpls.2020.00485

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Copyright © 2020 González-Gordo, Rodríguez-Ruiz, Palma and Corpas.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Activity (A) and relative quantification (B) of superoxide dismutase (SOD) isozymes of sweet pepper fruits at different stages of ripening: immature green (G), breaking point 1 (BP1), and breaking point 2 with and without NO treatment (BP2 + NO and BP2 – NO, respectively). Protein (5 μg per lane) samples were separated by non-denaturing polyacrylamide gel electrophoresis (PAGE; 8%), and the activity was detected by the nitro blue tetrazolium (NBT)-reducing method. Comparative total band intensities were quantified using ImageJ 1.45 software (see Supplementary Figure S1 for details). The gel pictures are representative of those obtained from at least three biological replicas repeated three times.