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《食品工业科技》2013,(06):334-337
为了解外源水杨酸处理对采后蓝莓果实苯丙烷代谢系统的影响及其作用机制,采用0.5mmol/L和1.0mmol/L的水杨酸对蓝莓果实进行浸泡处理,然后装入聚乙烯薄膜袋后松扎口,贮藏在1℃下。贮藏期间分析测定了蓝莓果实的感官品质、呼吸速率以及参与苯丙烷代谢的苯丙氨酸解氨酶(PAL)、多酚氧化酶(PPO)、过氧化物酶(POD)等酶活性和木质素含量等指标。结果表明,0.5mmol/L和1.0mmol/L的外源水杨酸处理均可促进蓝莓果实苯丙烷代谢的进程,从而使苯丙烷代谢的终产物-木质素的含量增加,进而增加了果实硬度并可有效地抵御微生物的入侵,减少果实腐烂,延长保质期。 相似文献
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本研究探讨水杨酸处理对库尔勒香梨贮藏期果实质地的影响。通过对库尔勒香梨进行水杨酸处理后,定期检测库尔勒香梨果实贮藏期细胞壁含量、细胞壁组成物质含量、果胶酶和纤维素酶活性等指标。结果表明水杨酸处理较好地保持香梨果实细胞壁含量,在贮期结束时达19.91 mg/g左右,并显著抑制了香梨果实贮藏期果胶酶和纤维素酶活性,减缓了水溶性和离子型果胶含量上升和共价结合型果胶含量及纤维素和半纤维素含量的下降。水杨酸处理对保持香梨果实细胞壁组分,延缓库尔勒香梨贮藏期果实衰老有积极作用。 相似文献
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以桃果实为试材,研究了采后不同浓度茉莉酸甲酯(Me JA)处理对损伤接种桃果实扩展青霉(Penicillium expansum)病斑扩展的影响,并分析了最佳浓度Me JA处理后桃果实细胞壁降解酶活性的变化。同时研究离体条件下Me JA对P.expansum菌丝生长和孢子萌发的影响。结果表明,100μmol/L Me JA对桃果实P.expansum的病斑抑制效果最好,并且显著(p≤0.05)抑制了菌丝生长和孢子萌发。100μmol/L Me JA处理明显抑制了桃果实多聚半乳糖醛酸酶(PG)、果胶甲酯酶(PME)、果胶甲基反式消除酶(PMTE)、多聚半乳糖醛酸反式消除酶(PGTE)和β-葡萄糖苷酶活性。由此表明,Me JA抑制桃果实青霉病的发生与延缓果实软化有关。 相似文献
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为研究脱落酸(abscisic acid,ABA)对采后番茄愈伤次生代谢物质合成的影响,以绿熟期樱桃番茄为材料,对果实损伤处理后,分别用ABA及其合成抑制剂氟啶酮(fluridone,FLD)抽真空渗透处理,黑暗条件下贮藏愈伤,每天取样测定相关生理指标。测定了果实失重率,伤口部位的总酚、类黄酮含量及相关酶活性,丙二醛(MDA)含量。结果表明:与对照相比,ABA处理减缓果实失重率升高,可有效促进伤口部位总酚、类黄酮的积累,提高与此相关的苯丙氨酸解氨酶(PAL)、超氧化物歧化酶(SOD)和过氧化氢酶(CAT)活性,降低丙二醛(MDA)含量,减少伤口部位氧化损伤,加速伤口愈合;FLD处理则起相反作用,加剧伤口部位氧化损伤,减缓伤口愈合进程。以上结果说明,ABA对采后番茄愈伤次生代谢物质合成具有促进作用。 相似文献
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The effects of salicylic acid (SA) on the quality and antioxidant activity of asparagus stored at 18 ± 2 °C were investigated by analyzing the color, chlorophyll, shear force, and the activity of antioxidant compounds such as ascorbic acid, phenolics, flavonoids, 1,1-Diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity ferric reducing antioxidant power (FRAP), and polyamines (PAs). The results showed that SA improved the color and maintained the chlorophyll, phenolic, flavonoid, and ascorbic acid content of asparagus. High concentrations of SA caused a deterioration in asparagus would harm to color and had no effect on shear force within 6 d. SA induced the maximum concentration of phenolics in postharvest asparagus, promoted the increase in total flavonoids before 6 to 9 d, affected the antioxidant activity positively as indicated by the resultant increase in FRAP concentration; however, SA was only active with regard to DPPH scavenging activity within 6 d of treatment. Spermidine (Spd) is the most common form of PA in asparagus, and free putrescine (Put) contents increased over the first 3 d following harvest and then decreased. Spd and Spm concentrations evolved in a similar way and decreased during storage. Higher Spd and Spm contents in the SA pre-treatment Put was inhabited and its peaks appeared later. 相似文献
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目的 研究水杨酸(salicylic acid, SA)和低温复合保鲜对韭黄(Allium tuberosum)品质的影响。方法 在SA和低温复合保鲜下,检测韭黄中蛋白质、维生素C (vitamin C, VC)、水分、持水力、总酸的含量,对韭黄中过氧化物酶(peroxide,POD)酶活、超氧化物歧化酶(superoxidedismutase,SOD)酶活、丙二醛(malondialdehyde,MDA)含量、过氧化氢酶(hydrogenperoxide,CAT)酶活进行测定。用TMS-Touch质构仪检测韭黄的嫩度、硬度等变化情况。结果 经过SA和低温复合处理的韭黄,蛋白质含量在第14 d最高,第28 d降低至21.99 mg/100 g;VC含量一直下降,最终下降至15.07 mg/100 g;水分在第21 d上升到最高,为92.66%;持水力在第28 d增加到了78%;总酸含量一直升高,最终达到6.57g/kg;POD酶活在第7d上升至2105.36U/g,第28d降低至464.52 U/g; SOD酶活在第7 d达到76.53 U/g,第28 d降至61.24 U/g; MD... 相似文献
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李子采后软化过程中细胞壁酶活性对果胶降解的影响 总被引:2,自引:0,他引:2
以半边红李子为实验材料,利用质构分析仪研究其常温贮藏软化过程,并考察主要细胞壁酶(果胶酯酶PE、外切多聚半乳糖醛酸酶exo-PG、内切多聚半乳糖醛酸酶endo-PG和葡聚糖苷酶EG)活性变化对果实软化及原果胶降解为可溶性果胶(WSP、ASP、HSP、SSP)的影响。结果表明,李子常温贮藏过程中PE活性变化较小,exo-PG活性一直不断下降,endo-PG活性不断升高,EG活性贮藏前期略有下降,8d之后开始不断升高。李子果肉硬度和粘性降低与原果胶和SSP降解关系密切,ASP降解与粘度降低极显著相关(p<0.01),HSP降解与果肉硬度下降显著相关(p<0.05)。果肉硬度和粘度变化与exo-PG活性极显著(p<0.01)和显著(p<0.05)相关。endo-PG活性变化对果肉硬度下降影响比较明显(p<0.05)。PE活性变化与原果胶、ASP、HSP、WSP含量变化均显著相关(p<0.05);exo-PG活性变化与原果胶、HSP含量变化极显著相关(p<0.01),与SSP、WSP含量变化显著相关(p<0.05);endo-PG对原果胶和HSP的降解影响比较大(p<0.05)。EG对果胶降解影响较小。 相似文献
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采后果实在经过储藏运输等一系列过程后会发生软化现象,而软化现象产生的原因有很多,例如由于细胞壁代谢相关酶活性的作用,使得细胞壁的物质成分、结构等发生改变;也可能是由于果实成熟后相关物质的变化以及受到植物激素的调控,进而促进果实成熟软化。本文综述了采后果实软化产生的原因,包括植物激素合成以及与受体结合进而促进果实软化、相关转录因子对果实软化的调控和果实软化相关的细胞壁代谢与碳水化合物代谢等途径,以期为探究采后果实软化机制提供参考。
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目的 分离、鉴定宁夏中宁地区引起枸杞鲜果采后病害的主要病原菌, 并研究水杨酸(salicylic acid, SA)的抑病效果。方法 采用常规方法从自然发病果实中分离病原真菌, 通过形态学和ITS(internal transcribed spacer)序列信息进行鉴定。使用不同浓度的水杨酸处理病原菌和果实, 观察SA对病原菌体外和体内的抑制效果。结果 共分离到4株病原真菌菌株, 它们均能引起枸杞鲜果的采后腐烂。其中, WB-1鉴定为梨黑斑链格孢(Alternariagaisen), WB-2鉴定为互隔链格孢(Alternariaalternata); WB-3和WB-4分别鉴定为镰刀霉属(Fusarium)和枝孢属(Cladosporium)真菌。SA对3种供试病原真菌的生长均有明显抑制作用, 且SA浓度越高抑制效果越明显。SA浸泡处理对常温和低温贮藏的枸杞鲜果病害有显著的控制效果, 并且SA处理对枸杞果实固形物含量(soluble solids content, SSC)无显著影响。结论 枸杞鲜果采后腐烂由多种病原真菌引起, SA处理对枸杞采后病害具有较好的控制效果, 具有潜在的应用前景。 相似文献
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Hot air treatment reduces postharvest decay and delays softening of cherry tomato by regulating gene expression and activities of cell wall‐degrading enzymes
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Yingying Wei Dandan Zhou Zhenjie Wang Sicong Tu Xingfeng Shao Jing Peng Leiqing Pan Kang Tu 《Journal of the science of food and agriculture》2018,98(6):2105-2112
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Effect of Pichia membranaefaciens combined with salicylic acid on controlling brown rot in peach fruit and the mechanisms involved 总被引:1,自引:0,他引:1
Xiangbin Xu Zhulong Chan Yong Xu Shiping Tian 《Journal of the science of food and agriculture》2008,88(10):1786-1793
BACKGROUND: Fruits are usually stored at low temperature to slow physiological metabolism, maintain quality and extend storage life. However, brown rot caused by Monilinia fructicola often occurs in peach fruit at low temperature, resulting in serious losses. As a promising alternative to the use of synthetic fungicides, the antagonistic yeast Pichia membranaefaciens showed a potential effect on controlling post‐harvest brown rot. To improve biocontrol efficacy of the yeast against fungal pathogen, the biocontrol efficacy of P. membranaefaciens combined with salicylic acid (SA) in inhibiting brown rot in peach fruit caused by M. fructicola was investigated. RESULTS: As compared to P. membranaefaciens used alone, the yeast combined with SA significantly reduced lesion diameter caused by M. fructicola, and increased the activities of chitinase, β‐1,3‐glucanase and peroxidase (POD), as well as enhanced the expressions of chitinase and β‐1,3‐glucanase genes in peach fruit. Moreover, SA at 2 mmol concentration did not affect yeast growth, but inhibited pathogen growth. CONCLUSION: The mechanism by which SA enhances the biocontrol efficacy of the antagonistic yeast against brown rot may be related to inducing biochemical defence responses in peach fruit, and a moderate inhibitory effect of SA on growth of M. fructicola. Copyright © 2008 Society of Chemical Industry 相似文献