Induction Mechanism of Methyl Jasmonate on Postharvest Navel Orange Fruit Against Blue Mold
In this study,'Newhall'navel orange fruits were used as experimental material and fumigated with 50 μmol·L-1 MeJA for 24 h,then 20 μL 1.25 × 106 spores·mL-1 blue mold pathogen Penicillium italicum spore suspension were injected,which to investigate the induced role of methyl jasmonate(MeJA)treatment on the resistance of postharvest navel orange fruit against blue mold.The results showed the blue mold lesion diameters of MeJA treatment group was significantly smaller than that of the control at 1-7 d after disease onset.The highest activities of POD,PPO,LAC,PAL,CAD,4CL and C4H and their relative gene expression levels except CsPPO in MeJA treatment group were higher than those of the control,respectively.At the same time,MeJA treatment promoted the accumulation of lignin,total phenolics,and flavonoids in navel orange fruits.Moreover,the content of phenylalanine and tryptophan in MeJA treatment group was significantly reduced.The above results indicated MeJA treatment might promote the accumulation of lignin,total phenolics and flavonoids content through regulating aromatic amino acids as well as stimulating the activities and gene expression of phenylpropanoid metabolic pathway-related enzymes,thereby inducing an enhancement in resistance of navel orange fruits against postharvest blue mold.
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