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Preharvest or a combination of preharvest and postharvest treatments with methyl jasmonate reduced chilling injury, by maintaining higher unsaturated fatty acids, and increased aril colour and phenolics content in pomegranate
Postharvest Biology and Technology ( IF 6.4 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.postharvbio.2020.111226
María E. García-Pastor , María Serrano , Fabián Guillén , Pedro J. Zapata , Daniel Valero

Abstract In the present research the effects of preharvest 5 mM methyl jasmonate (MeJa) treatments, alone (Pre) or in combination with postharvest 5 mM MeJa treatment (Pre + Post), on reducing chilling injury (CI) of pomegranate during 90 d of storage at 2 °C plus 3 d at 20 °C and its relationship with changes in fatty acid composition of cell membranes were assayed. In addition, fruit and aril quality traits, total content in phenolics and anthocyanins and antioxidant activity of the arils were evaluated. Both, external and internal CI symptoms and the increase in ion leakage (IL) were reduced by Pre and Pre + Post MeJa treatments. The major fatty acids in pomegranate husk were palmitic, oleic, linoleic and linolenic acids. MeJa treatments led to higher concentration of unsaturated fatty acids (UFA) at harvest, which wasmaintained at higher levels during storage, while saturated fatty acid (SFA) concentration was lower in treated fruit than in controls. The concentration of total phenolics and anthocyanins were lower in the arils from control fruit than in arils of Pre and Pre + Post treated fruit during the whole storage period. In general, there were no significant differences between Pre and Pre + Post MeJa treatments on their effects on reducing CI, maintaining membrane stability and bioactive compounds with antioxidant activity. Thus, preharvest MeJa treatments may be sufficient to increase the cold storage potential of pomegranate fruit by reducing CI symptoms and enhancing the content bioactive compounds with antioxidant activity.

中文翻译:

用茉莉酸甲酯进行采前或采前和采后联合处理,通过保持较高的不饱和脂肪酸并增加石榴中的假种皮颜色和酚类物质含量,减少冷害

摘要 在本研究中,单独(Pre)或与采后 5 mM MeJa 处理(Pre + Post)联合使用采前 5 mM 茉莉酸甲酯 (MeJa) 处理对减少 90 天石榴冷害 (CI) 的影响。 2℃+20℃3 d 的储存条件及其与细胞膜脂肪酸组成变化的关系。此外,还评估了果实和假种皮的品质性状、酚类物质和花青素的总含量以及假种皮的抗氧化活性。Pre 和 Pre + Post MeJa 治疗减少了外部和内部 CI 症状以及离子泄漏 (IL) 的增加。石榴壳中的主要脂肪酸是棕榈酸、油酸、亚油酸和亚麻酸。MeJa 处理导致收获时不饱和脂肪酸 (UFA) 浓度更高,其在储存期间保持在较高水平,而处理过的水果中的饱和脂肪酸 (SFA) 浓度低于对照。在整个贮藏期间,对照果实的假种皮中总酚类物质和花青素的浓度低于预处理和前+后处理果实的假种皮。总的来说,在降低 CI、维持膜稳定性和具有抗氧化活性的生物活性化合物方面,Pre 和 Pre + Post MeJa 处理之间没有显着差异。因此,采前 MeJa 处理可能足以通过减少 CI 症状和提高具有抗氧化活性的生物活性化合物的含量来增加石榴果实的冷藏潜力。在整个贮藏期间,对照果实的假种皮中总酚类物质和花青素的浓度低于预处理和前+后处理果实的假种皮。总的来说,在降低 CI、维持膜稳定性和具有抗氧化活性的生物活性化合物方面,Pre 和 Pre + Post MeJa 处理之间没有显着差异。因此,采前 MeJa 处理可能足以通过减少 CI 症状和提高具有抗氧化活性的生物活性化合物的含量来增加石榴果实的冷藏潜力。在整个贮藏期间,对照果实的假种皮中总酚类物质和花青素的浓度低于预处理和前+后处理果实的假种皮。总的来说,在降低 CI、维持膜稳定性和具有抗氧化活性的生物活性化合物方面,Pre 和 Pre + Post MeJa 处理之间没有显着差异。因此,采前 MeJa 处理可能足以通过减少 CI 症状和提高具有抗氧化活性的生物活性化合物的含量来增加石榴果实的冷藏潜力。Pre 和 Pre + Post MeJa 处理对降低 CI、维持膜稳定性和具有抗氧化活性的生物活性化合物的影响没有显着差异。因此,采前 MeJa 处理可能足以通过减少 CI 症状和提高具有抗氧化活性的生物活性化合物的含量来增加石榴果实的冷藏潜力。Pre 和 Pre + Post MeJa 处理对降低 CI、维持膜稳定性和具有抗氧化活性的生物活性化合物的影响没有显着差异。因此,采前 MeJa 处理可能足以通过减少 CI 症状和提高具有抗氧化活性的生物活性化合物的含量来增加石榴果实的冷藏潜力。
更新日期:2020-09-01
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