Preharvest application of methyl jasmonate (MeJA) in two plum cultivars. 1. Improvement of fruit growth and quality attributes at harvest

Preharvest treatments with salicylates enhance nutrient and antioxidant compounds in plum at harvest and after storage

“…). Hue angle has been reported to be a good colour index to show the occurrence of the typical colour changes from green to purple in plum cultivars with red‐purple skin, since it decreases during ripening (either on‐tree or during postharvest storage) , . On the other hand, TSS gradually increased and TA gradually decreased during storage, leading to increases in RI, these changes having been also delayed as a consequence of treatment with salicylates (data not shown).…”

“…Trees were treated with recently prepared SA, ASA or MeSA solutions (plus 0.5% Tween‐20 as surfactant) by foliar spray with a mechanical mist sprayer at three dates during the plum growth cycle: T1 (at pit hardening, 61 days after full blossom, DAFB); T2 (initial colour changes, 76 DAFB); and T3 (onset of ripening, 94 DAFB). These dates corresponded to key events of plum fruit development, according to previous experiments . The date of commercial harvest was established based on fruit size (weight ∼90 g, length > 50 mm and diameter > 55 mm), colour (purple skin, with small mahogany‐coloured areas on the shoulders) and content of total soluble solids (TSS, more than 10 °Brix, or 100 g kg −1 ) characteristic of this cultivar.…”

Preharvest application of methyl jasmonate (MeJA) in two plum cultivars. 2. Improvement of fruit quality and antioxidant systems during postharvest storage

“…In a previous paper (Martínez-Esplá et al, 2014), preharvest MeJA treatments resulted in fruit with higher size and weight, firmness and TA at time of harvest in 'Black Splendor' (BS) and 'Royal Rosa' (RR) plums. Interestingly, the phenolic content and antioxidant activity were also higher in treated than in control fruit during the last 3 weeks of fruit development in both plum cultivars.…”

“…from 2 cultivars 'Black Splendor' (BS) and 'Royal Rosa' (RR) were treated by foliar spray with methyl jasmonate (MeJA) at three concentrations (0.5, 1.0 and 2.0 mM) and at three key stages of fruit development, as previously described (Martínez-Esplá et al, 2014). The experiment was carried out in a commercial plot of the "El Ciruelo Company" located at Cieza (Murcia, Spain).…”

The Effect of Pre-Harvest Methyl Jasmonate Treatment on the Selected Volatile Compounds and Endogenous Hormones Contends in the Pulp of Grape Berries

“…For some nonaromatic fruit like eggplant, the role of MeJA is reversed to compare with grape, which delays postharvest ripening and senescence in the eggplant by decreasing enzymes association with phenolics metabolism [24]. The effect of MeJA on fruit ripening, TA and TSS contents is depend on the fruit species and concentration of MeJA applied [24,25].…”