Spatial and temporal variation of nutritional quality and its characteristics of wolfberry

【Objective】 The purpose of this study is to analyze the spatio-temporal variation,characteristics,and its influencing factors of the quality of wolfberry,so as to provide evidence for excellent variety breeding,quality improvement,brand building and standardized production of the fruit. 【Methods】 224 fruit samples were collected from Xinjiang,Ningxia and Gansu Province for three consecutive years(2020-2022) and then the contents of polysaccharide,total flavone and 16 kinds of amino acids were determined.Afterwards,the spatio-temporal variation of wolfberry quality under geographical origin,interyear,variety and their interaction were analyzed.Finally,combined with variance analysis,principal component analysis(PCA) and other methods were applied to screen the feature quality indicators and clarify the influence of each factor on the feature quality indicators. 【Results】 The nutritional quality of wolfberry fruit in different regions showed significant difference between years(P < 0.05),and was significantly correlated with wolfberry varieties(P < 0.05).The content of wolfberry polysaccharide was mainly affected by the origin factors,and the variation contribution rate was 6.79%.The total flavonoids of wolfberry were mainly affected by interannual factors,and the variation contribution rate was 51.84%.The contents of polysaccharides and total flavonoids in Xinjiang were significantly higher than those in the other two producing areas(P < 0.05).The high quality variety was Ningqi No.1.In contrast,the content of total flavonoids and polysaccharide in Gansu wolfberry was significantly lower than that in Xinjiang(P < 0.05).Secondly,variety and year were the main factors affecting the total amino acids of wolfberry,and the variation contribution rates were 21.40% and 15.99%,respectively.The high-quality amino acid producing area was Ningxia,and the high-quality variety was Ningqi 5. 【Conclusion】 The same varieties of wolfberry introduced in Ningxia will show different characteristics in different places of cultivation.Wolfberry in Xinjiang showed relatively high polysaccharides and total flavonoids,Ningxia showed relatively high total amino acids,and Gansu showed relatively low polysaccharides and total flavonoids.