RAPISARDA Viviana Andrea
congresos y reuniones científicas
Postharvest UV-B radiation in lemon fruits of different seasons.
HILAL, M.; RODRÍGUEZ MONTELONGO, L.; LÓPEZ DOMÍNGUEZ, M. E.; GALLARDO M.; ROSA, M.; INTERDONATO, R.; VOLENTINI, S. I.; RAPISARDA, V. A.; PRADO, F. E.
Congreso; XLII Reunión Anual de SAIB; 2006
UV-B radiation acts as an environmental stressor, leading to multiple responses in primary and secondary metabolisms. In plants, production of flavonoids and other phenols is important for tolerance against UV-B and pathogens. The aim of our work was to analyze the flavonoid and malondialdehyde (MDA) contents in lemons exposed to different UV-B radiation and to check fruits susceptibility to wound infection by Penicillium digitatum. Lemons were collected either in summer or winter from CITRUSVIL S.A. packing. Fruits were exposed to UV-B for different periods of time and the flavonoid and MDA were measured in flavedo 24 h after the treatment. Then, the exposed fruits were infected with P. digitatum spores. In control lemons, the flavoniod contents were higher in summer than in winter. The UV-B treatment produced a 6-time increase in flavonoids in summer fruits, whereas no changes were observed in winter. The levels of MDA in irradiated lemons were higher in winter than in summer. In general, a decreased in the infection rate was observed upon UV-B treatments. UV-B radiation could induce in lemon flavedo signals associated to pathogen/UV-B protection.