Abstract:Effect of sodium silicate treatment on pink rot of apricot fruit(cv.Lixing) and its partial mechanism were studied in this manuscript.Inhibitory effect of sodium silicate on Trichothecium roseum was evaluated by in vitro.Apricot fruits were dipped with sodium silicate at different concentration(0,25,50 and 75 mmol/L) for 10 min,the inhibition effect of treatment on the lesion diameter of fruit inoculated with T.roseum were investigated during storage at room temperature.Two defense enzyme peroxidase(POD) and polyphenol oxidase(PPO) activities and disease resistance substances total phenolic and flavanoids accumulation in fruits were also detected.The results showed that sodium silicate significantly inhibited mycelial growth of T.roseum in vitro,with the inhibition rate of 85% when 25 mmol/L sodium slicacate was used.Moreover,application of sodium silicate reduced pink rot development on artificially inoculated apricot fruit.It was found that 50 mmol/L sodium slicacate showed the highest inhibitory effect on pink rot for 72 h.Furthermore,Sodium silicate treatment increased the activities of peroxidase(POD) and polyphenol oxidase(PPO) in apricot fruit,enhanced accumulation of total phenolic.However,no significant difference was found in flavanoids between treated and control fruit.Therefore,it is suggested that postharvest sodium silicate treatment can reduce pink rot in apricot fruits by inhibiting the growth of pathogen and inducing resistance in fruit.
