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However, information ofthe application of MeJA as a preharvesttreatmentis much limited, and most ofthe reports deal on inducingdisease resistance, as has been observed on reducing infection ofMonilinia fructicola in sweet cherry (Yao and Tian, 2005). In peach,preharvest application of MeJA affected ripening depending uponthe fruit developmental stage and applied dose. Concentrationsof 0.4 mM applied at S3 stage delayed the fruit ripening, while atS3–S4 any effect was observed (Ziosi et al., 2008), while higher concentrations(8 mM) advanced the onset of ripening (Janoudi andFlore, 2003). MeJA treatment to early developmental stage applesinduced a delay ofthe ripening process, while an acceleration ofthisprocess occurred when MeJA was applied atthe latest developmentalstages (Rudell et al., 2005). Specifically in plum, MeJA treatmentat 5 or 10 mM, 2 weeks before harvest, retarded colour change andaccumulation of total soluble solids (TSS) during on-tree ripeningwhile firmness was not affected (Karaman et al., 2013).
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