覆盖透湿性反光膜对桃品质的影响  

Effects of vapor-permeable reflective film mulching on fruit quality of peach

作　　者：胡湘明[1,2] 张慧琴[2] 肖金平[2] 张琛[2] 马常念[2] 谢鸣[2] 

机构地区：[1]浙江师范大学化学与生命科学学院,浙江金华321004 [2]浙江省农业科学院园艺研究所,浙江杭州310021

出　　处：《浙江农业学报》2012年第5期814-820,共7页Acta Agriculturae Zhejiangensis

基　　金：浙江省农业厅"三农五方"科研项目(2008R05A60D01);浙江省农业科学院提升工程项目(2008R05Y01D02)

摘　　要：以水蜜桃品种‘湖景蜜露’和油桃品种‘紫金红1号’为材料,研究覆盖透湿性反光膜后对不同时期桃果实可溶性糖、有机酸,主要生物活性物质(总酚,花青苷)含量变化的影响,同时采用DPPH法,FRAP法二种抗氧化活性评价方法比较处理与对照果实抗氧化能力差别。结果表明,覆盖透湿性反光膜提高了成熟桃果实可溶性固形物(TSS)含量,降低了可滴定酸(TA)含量,提高了桃果实总酚含量及抗氧化能力。相关性分析表明,果实总糖含量与蔗糖含量呈极显著正相关,TA含量与奎宁酸和异柠檬酸呈显著正相关。由此认为反光膜处理下桃果实TSS升高主要是蔗糖含量增加所致,果实TA含量下降主要是降低了奎宁酸和异柠檬酸含量所致。结果还表明,总酚含量与果糖含量、DPPH自由基清除能力、铁离子还原能力均呈显著正相关。由此推断覆膜提高了果实果糖含量且促进酚类物质的合成,提高了果实抗氧化活性。覆膜还提高了果皮中花青苷含量,促进了果实着色,提高了果实光亮度,表现为覆膜后果实L*值,a*值显著高于对照。Effects of vapor-permeable reflective film mulching on sugar accumulation, organic acid content and bioactivator （total phenolics, anthocyanin contents） of two peach varieties were investigated, meanwhile, the antioxidant capacity was measured by assays of 1,1 ＇-diphenyl-2-picrylhydraz scavenging （DPPH） and Ferric reducing antioxidant power（FRAP）. The results showed that mulching of vapor-permeable reflective film significantly increased the total soluble solid content （TSS）, reduced the titratable acid content （TA）, and increased the total phenol content and antioxidant capacity. The correlation analysis showed that there was significantly positive correlation between the total sugar content and the sucrose content, as well as TA content and quinic acid and isocitric acid. This indica- ted that the increase of TSS under mulching of vapor-permeable reflective film was caused by the increase of sucrose content, and the decrease of TA content was attributed to the reduction of quinic acid and isocitric acid content. The total phenol content was significantly positive correlated with the fructose content, DPPH free radical scavenging ca- pacity and iron ion reductive ability. It was concluded that the increased fructose content promoted the synthesis of phenolics and increased the antioxidant capacity of fruits; furthermore, the increased anthocyanin contents in the peel improved fruit coloring and increased fruit brightness, the L^＊ and a^＊ values were higher that the control under mulching of vapor-permeable reflective film.

关 键 词：透湿性反光膜 桃 品质 

分 类 号：S662.1[农业科学—果树学]