La luz azul reduce las colonización por hongos en las mandarinas

Título original : Blue light alters infection by Penicillium digitatum in tangerines
Autores :Alferez, Fernando; Liao, Hui-Ling; Burns, Jacqueline K.
Resumen : The effect of blue light exposure on Penicillium digitatum infection of tangerines during postharvest storage was investigated. In citrus, P. digitatum is one of the most important fungi causing diseases that result in postharvest loss. There is increasing interest in development of environmentally sustainable and consumer-friendly strategies of decay control. Strategies based on a plant's immunity can minimize pathogen infection of fruit. Light signalling affects plant-pathogen interactions and blue light may modulate phospholipase activation, a key step in plant immune responses. Exposure of fruit to 410-540 nm blue light at a fluency of 40 mu mol m(-2) s(-1) reduced infection by P. digitatum and induced phospholipase A(2) (PLA(2)) gene expression. Inhibition of PLA(2) activity allowed infection, whereas inhibition of phospholipase D (PLD) expression by 580-670 nm red light at the same fluency was correlated with infection. These data strongly suggest that induction of lipid signalling by light reduces fungal colonization by P. digitatum in citrus fruit. (C) 2011 Elsevier B.V. All rights reserved.
Direcciones :
1. CSIC, Inst Agroquim & Tecnol Alimentos, Valencia 46100, Spain
2. Univ Florida, IFAS, Dept Hort Sci, Citrus Res & Educ Ctr, Lake Alfred, FL 33850 USA