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Thai) 2:
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BS plum has a black skin with beet-red flesh while RR possess ared skin and yellow flesh, and both are very appreciated by con-sumers since they are some of the first stonefruit reaching themarket. Parameters related to fruit quality, such as colour changeand the content of total soluble solids (TSS) and total acidity (TA)were also followed during the growth cycle, although only datafrom the last 3 sampling dates are shown at which the majorchanges occurred (Fig. 2). Colour, expressed as Hue angle, decreasedfor both cultivars from 14 days before harvest (DBH) to harvest (H)showing the occurrence of the typical purple and light red skincolour for BS and RR, respectively. For both, Hue at harvest wassignificantly higher in 0.5 mM MeJA-treated fruit (∼=46) than incontrols (∼=27–31), showing an effect of this MeJA treatment ondelaying colour development. On the other hand, TSS increasedfor cultivars during on-tree ripening, although any effect observedattributable to treatment with final values ca. 11 and 9.5 g 100 g−1for BS and RR cultivars (Fig. 2). On the contrary, TA decreased duringthe last sampling dates, reaching final concentrations of 1.83 and1.17 g 100 g−1for control BS and RR, respectively, and the effectof MeJA treatment was just significant at harvest time and for the0.5 mM treatment, for which TA was significantly higher (P < 0.05)than in controls. Change in fruit firmness during growth and on-tree ripening for both cultivars revealed that flesh softening startedafter pit hardening and progressively continued until harvest day,although the rate of softening was significantly retarded by MeJAtreatments (Fig. 3). Thus, at the time of harvest the firmest fruitwere those treated with MeJA 0.5 mM for both cultivars, with valuesof 14.44 ± 0.61 and 13.21 ± 0.68 N mm−1for BS and RR, respec-tively, while in control fruit, firmness levels were ca. 7.5 N mm−1for both cultivars.
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