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,characteris-tics,and its influencing factors of the quality of wolfberry,so as to provide evidence for excellent variety breed-ing,quality improvement,brand building and standardized production of the fruit.[Methods]224 fruit sam-ples 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 meth-ods 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 contribu-tion rate was 6.79%.The total flavonoids of wolfberry were mainly affected by interannual factors,and the vari-ation contribution rate was 51.84%.The contents of polysaccharides and total flavonoids in Xinjiang were sig-nificantly 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 culti-vation.Wolfberry in Xinjiang showed relatively high polysaccharides and total flavonoids,Ningxia showed rela-tively high total amino acids,and Gansu showed relatively low polysaccharides and total flavonoids.
国家科技期刊平台
NSTL
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