一年两收"阳光玫瑰"葡萄浆果糖酸组分及含量差异分析OA

[Objective]The 5-year-old"Shine Muscat"grape under two-crop-a-year cultivation mode was used as the experimental material to explore the differences in sugar and acid components and contents during the development of summer and winter,so as to provide theoretical basis for the quality control of"Shine Muscat"under two-crop-a-year cultivation mode.[Method]The climatic data,such as the photosyntheti-cally active radiation,temperature and rainfall during the young fruit stage(E-L31),expansion stage(E-L33),veraison(E-L35),initial matu-rity stage(E-L36),mature stage(E-L38)of"Shine Muscat"were recorded.Meanwhile,the components and contents of sugar in the peel of summer and winter grapes of"Shine Muscat"were detected by HPIC,and acid were detected by HPLC.[Result]The effective photosynthetic radiation of the summer fruits of"Shine Muscat"grapes,ranging from E-L33 to E-L38,was higher than that of the winter fruits.The water heat coefficient of summer fruit at E-L38 was higher than that of winter fruit.The temperature of summer fruit remained at a relatively high level and fluctuates little throughout the development process,while the temperature of winter fruit fluctuates greatly throughout the development process and was relatively low within the range of E-L35 to E-L38.In E-L38,the total sugar content of summer fruits was significantly higher than that of winter fruits,while there was no significant difference in the total acid content between the two.The contents of glucose and fructose in both summer and winter fruits gradually increased during the development.The contents of glucose and fructose in E-L38 in summer fruits were sig-nificantly higher than those in winter fruits.Both summer and winter berries were mainly composed of malic acid and tartaric acid,with relatively low contents of oxalic acid and citric acid.The contents of oxalic acid,tartaric acid and citric acid in E-L38 of summer fruit berries were signifi-cantly higher than those of winter fruit,while malic acid was significantly lower than that of winter fruit.Citric acid was not detected in winter fruit during this period.[Conclusion]In the year of the experiment,the"Shine Muscat"grapes had better accumulation of summer fruit sugar content and more prominent sour taste characteristics in winter fruit.During the E-L38 period,the content of glucose,fructose,oxalic acid,tar-taric acid and citric acid in summer fruit was higher than that in winter fruit,while the content of malic acid was lower.Therefore,the sour taste of winter fruit lasts longer and was more refreshing.The differences in temperature,hydrothermal coefficient and effective photosynthetic radia-tion during the development period of berries may be important factors causing the differences in the components and contents of fructosic acid between summer fruits and winter fruits.