<b>‘Navelina’ oranges submitted to pre-harvest resistance inducers

• Main Authors: Marines Batalha Moreno Kirinus, Caroline Farias Barreto, Pricila Santos da Silva, Roberto Pedroso de Oliveira, Marcelo Barbosa Malgarim, José Carlos Fachinello
• Format: Article
• Language: English
• Published: Eduem (Editora da Universidade Estadual de Maringá) 2018-08-01
• Series: Acta Scientiarum: Agronomy
• Subjects: Citrus sinensis; navel orange; elicitors; refrigerated storage; rotting.
• Online Access: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/39465

The objective of this study was to evaluate the physical-chemical characteristics, rot index and bioactive compounds of ‘Navelina’ oranges under postharvest refrigerated storage conditions after pre-harvest resistance induction in crops from 2015 and 2016. The field experimental design was completely randomized blocks. The treatment factors were composed of the following resistance inducers: noresistance inducer (control), selenium (Se), silicon (Si), acibenzolar-s-methyl (ASM), methyl jasmonate (MeJa), thiamethoxam (TMT) and imidacloprid (IMI). In the laboratory, the experimental design was the same as that in the field, but it used a two-factor scheme instead of a unifactorial scheme. In the two-factor scheme, factor A was composed of the abovementioned resistance inducers, and factor B was composed of the refrigerated storage periods (zero and 30 days). The analyses investigated the coloration, fresh mass loss, rot index, soluble solids, pH, titratable acidity, SS/TA ratio, ascorbic acid, total phenolic compounds and antioxidant capacity of the oranges. The application of pre-harvest resistance inducers was efficient in maintaining the physical-chemical characteristics of the ‘Navelina’ oranges in postharvest, increasing their bioactive compounds in comparison to the control. The resistance inducers Se, Si, MeJa, and IMI reduced rot rates, while ASM and MeJa prevented fresh fruit mass loss.