Ozturk Burhan, Yıldız Kenan, Kucuker Emine
Department of Horticulture, Faculty of Agriculture, Ordu University, Cumhuriyet Campus, 52200, Ordu, Turkey.
J Sci Food Agric. 2015 Feb;95(3):583-91. doi: 10.1002/jsfa.6787. Epub 2014 Jul 15.
The effects of pre-harvest methyl jasmonate (MJ) treatments on ethylene production, respiration rate, bioactive compounds and physico-chemical parameters of plum fruits (Prunus salicina Lindell cv. 'Fortune' and 'Friar') were investigated. Whole trees were sprayed once with an aqueous solution containing MJ (0, 1120 and 2240 mg L(-1)) 2 weeks before the anticipated commercial harvest for each cultivar.
In both plum cultivars, 1120 mg L(-1) MJ significantly increased hue angle of fruits. The fruit mass and geometric mean diameter were lower in MJ treatments while flesh firmness was higher, except at initial harvest date. Soluble solids concentration increased and titratable acidity decreased with MJ treatments. MJ-treated fruits exhibited higher levels of ethylene production and respiration rate. MJ was more effective in increasing water-soluble antioxidant activity, water-soluble phenolics and individual phenolics. Chlorogenic acid, caffeic acid, rutin, ferulic acid, naringenin and kaempferol contents significantly increased with 2240 mg L(-1) MJ.
This study revealed that pre-harvest MJ treatments were effective in delaying softening of late-harvested fruits and increasing bioactive compounds of plum fruits.
研究了采前茉莉酸甲酯（MJ）处理对李果实（李属李品种‘福星’和‘Friar’）乙烯生成、呼吸速率、生物活性化合物及理化参数的影响。在每个品种预期商业采收前2周，对整株树喷施一次含有MJ（0、1120和2240 mg L⁻¹）的水溶液。
在两个李品种中，1120 mg L⁻¹的MJ显著增加了果实的色相角。除初始采收日期外，MJ处理的果实质量和几何平均直径较低，而果肉硬度较高。MJ处理使可溶性固形物浓度增加，可滴定酸度降低。MJ处理的果实表现出较高的乙烯生成量和呼吸速率。MJ在提高水溶性抗氧化活性、水溶性酚类物质和个别酚类物质方面更有效。2240 mg L⁻¹的MJ使绿原酸、咖啡酸、芦丁、阿魏酸、柚皮素和山奈酚含量显著增加。
本研究表明，采前MJ处理可有效延缓晚采果实的软化，并增加李果实的生物活性化合物。
