Journal
FOOD CHEMISTRY
Volume 341, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2020.128050
Keywords
Disease; Light; Photooxidative stress; Primary and secondary metabolism
Funding
- Spanish Ministry of Economy and Competitiveness
- European Regional Development Fund [AGL2013-41734-R, AGL2017-88120-R]
- Generalitat Valenciana, Spain [PROMETEOII/2014/027]
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LED Blue Light (LBL) at 450nm can induce biochemical changes in oranges, leading to increased resistance against postharvest pathogen Penicillium digitatum. LBL promotes energy metabolism and redirects metabolic pathways towards the synthesis of various primary and secondary metabolites in oranges.
The biochemical changes induced by LED Blue Light (LBL) (450 nm) in Lane Late oranges were investigated. The selected quantum flux (60 mu mol m(-2) s(-1), 2 days) was associated with resistance against Penicillium digitatum, the main postharvest pathogen of citrus fruit. A holistic overview was obtained by a comparative transcriptome profile analysis, which revealed that LBL favored energy metabolism and redirected metabolic pathways toward the synthesis of diverse primary and secondary metabolism products. LBL favored reactive oxygen species homeostasis and metabolic activities involving lipid metabolism, specifically the synthesis of pigments and oxylipins, and the metabolism of carbohydrates, amino acids and indoland alkaloid-derivatives. LBL also repressed limonene catabolism and triggered phenylpropanoid derivatives-related changes, which increased content in total flavonoids. Transferring fruit from LBL to darkness favored those processes involving amino acids, different phenylpropanoid, alkaloid and terpenoid classes, and ferrochelatase activity.
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