The ripening index system of'Cabernet Sauvignon'grapes in Minqin area of Gansu province
[Objective]To determine the ripeness index system of'Cabernet Sauvignon'strain wine grapes in Minqin area of Gansu.[Method]Five wine grapes planted mainly in Minqin area of Gansu province were used as the research objects.Starting from September 9(80 d after flowering),grape samples were collected at 3 d intervals for a total of six times,and changes in basic physicochemical indexes,polyphenol indexes and sugar-acid fractions of the grape berries were determined and analyzed.[Result]With the continuous ripening of the fruit,the total sugar,soluble solids,pH value gradually increased,and the content of total acid showed a gradually decreasing trend;the 100-grain mass of the fruit gradually increased,and reached the highest value with a slight decreasing trend;the pattern of change of the sugar component in the berry was the same as that of the total sugar as well as the soluble solids content,which was on an increasing trend;according to the changes in the basic physicochemical indexes of the fruits in different harvesting periods,polyphenol indexes and the sugar-acid components,a comprehensive score evaluation of fruit quality was carried out based on principal component analysis,and the results showed that:'Cabernet Sauvignon'strain had the highest quality score in the last harvesting period(i.e.,100 d after flowering),and the'Cabernet Sauvignon'grape maturity index system in Minqin area of Gansu province was further established.The index system of grape maturity was further established.The first-level indexes of'Cabernet Sauvignon'lines were all sugar-acid ratios,and the optimal ranges of values were:Cabernet Sauvignon 15(26.26-28.05),Cabernet Sauvignon 169(27.03-28.53),Cabernet Sauvignon 170(26.89-27.26),and Cabernet Sauvignon VCR11(25.34-27.43),and Cabernet Sauvignon VCR19 were anthocyanin,and the optimal range of values was(8.84-10.59 mg·g-1).The secondary indicators were dominated by total phenols and tannins,and tertiary indicators were mostly vitamin C.[Conclusion]The best harvesting period of'Cabernet Sauvignon'grapes in Minqin area of Gansu was 100 d after flowering,and a 3-level maturity index system with sugar-acid-based and polyphenol-supplemented was established by calculating the weights of the indexes,with the first-level indexes being the sugar-acid ratio,the second-level indexes being based on total phenolics and tannins,and most of the third-level indexes being vitamin C.
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