疏穗处理对‘赤霞珠’葡萄果实糖、酸及异戊二烯类香气物质积累的影响  

Effect of cluster thinning on sugar/acidity and the accumulation of isoprene-derivated volatiles in‘Cabernet Sauvignon'grape berries

作　　者：李越 姚冠榕 陈武 陈新军 王军[1,2] 潘秋红 LI Yue;YAO Guanrong;CHEN Wu;CHEN Xinjun;WANG Jun;PAN Qiuhong(Center for Viticulture and Enology, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China;Key Laboratory of Viticulture and Enology, Ministry of Agriculture, Beijing 100083, China;Xinjiang CITIC Guoan Wine Co. Ltd., Manasi 832200, Xinjiang, China)

机构地区：[1]中国农业大学食品科学与营养工程学院葡萄与葡萄酒研究中心,北京100083 [2]农业部葡萄酒加工重点实验室,北京100083 [3]新疆中信国安葡萄酒业有限公司,新疆玛纳斯832200

出　　处：《果树学报》2018年第2期185-194,共10页Journal of Fruit Science

基　　金：国家自然科学基金(31272118;31471834)

摘　　要：【目的】探明2个疏穗处理对新疆玛纳斯产区‘赤霞珠’葡萄果实异戊二烯代谢产生的香气物质组成及含量的影响。【方法】分别以"广东地"和"园艺场"2个葡萄园为试验地,在果实发育早期(花后26 d)进行1穗/新梢(CT1)和2穗/新梢(CT2)疏穗处理,应用GC-MS定性定量分析游离态和糖苷结合态萜烯和C13-降异戊二烯物质的变化。【结果】2种疏穗处理对果实可溶性固形物和可滴定酸含量的影响因试验地块而异,且疏穗处理不会改变果实中香气物质的种类,但影响其含量;与CT2相比,CT1处理提高了果实中大部分异戊二烯来源的香气组分的含量,增加最明显的是游离态E-β-大马士酮及结合态α-萜品醇,且CT1处理对香气物质积累的促进作用在广东地表现更加明显,笔者认为这与广东地土壤相对较高的有机质含量和矿质元素有关。【结论】1穗/新梢的疏穗可以提高果实中潜在花果香气味组分的含量,改善葡萄酒果香质量。[ Objective] Both terpenoids and C 13-norisoprenoids are generated from the isoprene metabolic pathway. These volatiles generally possess very low sensory threshold and pleasant aroma attributes, thus making an important contribution to the floral and fruity odor of grape berry and wine. Cluster thin- ning is usually required in viticultural management. Previous studies have demonstrated that suitable lev- el of cluster thinning helps to improve the flavor and aroma quality of grape berry and wine. By contrast, either too high or too low fruit loading will cause negative effects on the accumulation of the compounds having sensory importance. And the cluster thinning level depends upon grapevine growing environment to a large extent. Xinjiang is a unique region of grape and wine production in China, and the climate of this region is characterized by long sunshine time, strong solar intensity, little rainfall and big diurnal temperature difference. However, the effect of cluster thinning on the volatile accumulation under this particular climate has been poorly understood up to now. The present study aimed at understanding the effects of two cluster thinning treatments on the composition and concentrations of free-form and glycosidically bound isoprene volatiles in developing ＇Cabernet Sauvignon＇ （Vitis vinifera L.） grape berries in Manasi, Xinjiang. The research outcome will provide valuable reference for the improvement of wine aroma quality in this region, and lay a foundation for further study on isoprene metabolism and regulation in grape berry. [ Methods ] The cluster thinning treatments were conducted in the two vineyards belonging to the Xinjiang CITIC Guoan Wine Co. Ltd located in Manasi county, Xinjiang. The soils of the two vineyards, called as Guangdongdi and Yuanyichang, possessed different water holding capacity and organic matter content, and all the grapevines were trained into the system of modified vertical shoot position （M-VSP） with 12- 15 shoots per vine. The grapevines were cluster

关 键 词：'赤霞珠’葡萄 果实 疏穗处理 萜烯 C13-降异戊二烯 

分 类 号：S663.1[农业科学—果树学]