不同浓度乙醛处理对桃果实软化及相关生理代谢的影响  

Effects of Acetaldehyde Treatment at Different Concentrations on Softening of Post-Harvest Peach and Some Related Physiological Metabolism

作　　者：曲凤静[1] 韩涛[1] 李丽萍[2] 李建黎[1] 孙宇婧[1] 

机构地区：[1]北京农学院食品科学系,北京102206 [2]北京工商大学化工学院,北京100037

出　　处：《中国农业科学》2009年第1期245-250,共6页Scientia Agricultura Sinica

基　　金：北京市属市管高校人才强教计划资助项目(0014-05-1671);北京市中青年骨干教师培养计划资助项目(PXM2007_014207_044539);北京市教委资助项目

摘　　要：【目的】研究乙醛浓度处理对桃果实软化的影响。【方法】以‘大久保’桃为试材,用0、0.5、1和2ml·kg-1乙醛熏蒸桃果实12h后分别贮藏于室温(20±2)℃和(0±2)℃下,测定果实硬度及相关酶活性。【结果】在20℃条件下,经0.5和2ml·kg-1处理的果实多聚半乳醛酸酶活性(PG)低于对照及1ml·kg-1处理;各浓度处理有提高果实果胶甲酯酶活性(PE)、降低β-半乳糖苷酶活性(β-GAL)的趋势;0℃下,乙醛处理后果实PG活性及PE活性与对照无明显差异,经1和2ml·kg-1处理果实β-GAL活性高于对照及0.5ml·kg-1处理,但差异不显著。【结论】在2种贮藏温度下,适当浓度的乙醛处理使果实保持较高硬度,较低呼吸强度,并降低果实可溶性果胶含量。[Objective] The effect of acetaldehyde treatment on softening of postharvest ‘Okubo＇ peach （Prunus persica L.） was investigated. [Method] The peaches were fumigated with 0, 0.5, 1 and 2 ml·kg^-1 acetaldehyde for 12 hours, then stored at room temperature （20±2）＊Cor （0±2）℃. The changes of firmness and related enzymes in fruits were detected. [Result] At 20℃, the activities of PG （polygalacturonase） in 0.5 ml·kg^-1 and 2 ml·kg^-1 treatments were lower than those in control and 1 ml·kg^-1 treatment, and all of the treatments trended to increase PE （pectin esterase） and decrease β-galactosidase activities. At 0℃, the activities of PG and PE in acetaldehyde treatments showed no obvious differences with control, and the β-galactosidase activities in 1 ml·kg^-1 and 2 ml·kg^-1 treatments were higher than control and 0.5 ml·kg^-1 treatment with no significant differences. [ Conclusion ] The result showed that acetaldehyde treatments at suitable concentration maintained the higher firmnesses, lower respiration rates and decreased the contents of water-soluble pectin both at room temperature （20±2）℃ and （0±2）℃, respectively.

关 键 词：桃 乙醛 软化 贮藏 

分 类 号：S662.1[农业科学—果树学]