Amino acid metabolism and expression of genes involved in nitrogen assimilation in common oranges cv. Valencia Late

Biochemical and transcriptional approaches can provide crucial evidence about the physiological changes which occur in organic conventional cultivated common orange [Citrus sinensis (L.) Osbeck]. This study aimed to investigate change physicochemical parameters, concentrations of free amino acids other N-containing compounds, expressions key genes coding for enzymes linked N assimilation fruits cv. "Valencia Late". Two involved different ways were considered: nitrate reductase (NR), catalyzing conversion into nitrite, glutamate dehydrogenase (GDH), operating ammonium (interacting with synthase), re-assimilation through deamination. Results showed that fertilizers did not affect characteristics but induced accumulation acids, higher proline contemporarily lower glutamate, addition upregulated expression GDH gene from organically managed tress. identified a possible adaptive response plants or fertilizers. The present work is intended as first step make mechanisms underlying plant responses supply clearer by comparing cultivation. It also support breeders select best citrus cultivars agronomists improve crop fertilization production management.