[Objectives]This paper aimed to explore the quality traits of'Chardonnay'and'Viognier',two winemaking white grape varieties in Rushan area,in order to provide certain theoretical basis for the utilization,introduction and promotion of white winemaking varieties.[Methods]'Chardonnay'and'Viognier'were used as the test materials,and the quality traits of fruits were analyzed in the veraison stage and maturity stage,and the transcriptome sequencing was performed on the fruits in the veraison stage and maturity stage.[Results]At the maturity stage,'Viognier'was higher in grain weight,transverse diameter,longitudinal diameter,total phenolic content,soluble sugar content and total soluble solids(TSS)content,and'Chardonnay'was higher in total organic acid content.From the veraison stage to maturity stage,the soluble sugar,TSS and total phenol contents in'Viognier'changed more rapidly than'Chardonnay'.Among the sugar fractions,fructose and glucose content changed more rapidly,while other traits showed similar changes.The results of transcriptome analysis showed that the number of differentially expressed genes(DEG)was higher in'Viognier'than in'Chardonnay'from the veraison stage to maturity stage.Both differentially expressed genes were most distributed on chromosome 18 and least distributed on chromosome 15.In addition,the metabolic pathways of genes related to glycolate metabolism were screened by GO functional analysis and KEGG metabolic pathway analysis of differentially expressed genes.[Conclusions]There were differences in fruit quality between two white grape varieties in different periods,mainly in terms of total organic acid content,soluble sugar content,TSS content,total phenol contents and transverse and longitudinal diameter of the fruit.From the veraison stage to maturity stage,the development of fruit traits in'Viognier'was faster than that of'Chardonnay'.The differences in the expression levels of related genes in the glycolic acid anabolic pathway between two varieties might be the reason for the differences in fruit quality traits between two white grape varieties.
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