Preharvest Methyl Jasmonate Treatment Improves Storage Quality of Vitis vinifera L. cv. Red Globe Grapes
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Abstract:
Red Globe grapes were used as the research materials. Methyl jasmonate (MeJA; 0, 50, 100, and 200 μmol/L) was sprayed during the expansion period, the color change period, and 2 days before harvest (pre-harvest period). The treated fruits were stored at 0±1 ℃. The results showed that under the in vitro conditions, MeJA had insignificant effect on the growth and colony diameter of Botrytis cinerea (p< 0.05), although higher concentrations of MeJA had a certain inhibitory effect on its growth. During storage, MeJA can significantly inhibit the occurrence of post-harvest fruit decay, delay the decline of fruit hardness, increase the content of fruit soluble solids, and maintain the titratable acid content of fruits. The MeJA treatment at 100 μmol/L worked better than those at other concentrations. At Day 50 of storage, the incidence rate of the CK group was 86.09%, which was 1.53 times that of the MeJA treatment group (which had a soluble solids content of 17.3% and a titratable acid content of 0.675%). At Day 40, the fruit hardness for the MeJA treated group was 7.5 N (which was 1.59 times that for the CK group), and the CHI activity of the MeJA treated group was 370.12 U/g. At Day 20 the GLU activity of the MeJA-treated group was 105.86 U/g (which was 1.11 times that of the CK group). At Day 10, the PAL and POD activities for the MeJA treatment group were 2.43 U/g and 0.506 U/g, which were 1.18 and 1.58 times, respectively, those of the CK group. Preharvest MeJA spraying can effectively induce the increase of PAL, POD, CHI and GLU activities of the fruits, indicating that this treatment can increase the resistance to post-harvest diseases, improve grape storage outcome and reduces post-harvest decay through inducing and increasing the enzymatic activities in grapes.
