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