Seven-year-old 'Ponkan' mandarin (Citrus reticulate Blanco) on trifoliate rootstocks (Poncirus triforliata L.) were employed monitor as to the changes of endogenous polyamines (PAs) and salicylic acid (SA) concentrations pre- and postharvest, and correlated to postharvest storage life. The results showed that endogenous concentrations of free polymines and SA peaked in October at a maximum of 1,233 nmol·g-1FW and 2,150 ng·g -1FW, respectively. Then declined gradually during postharvest storage. The decline paralleled observed peel senescence....
