酿酒葡萄'品丽珠'芽变早熟株系酚类物质特征分析OA

In order to select early-ripening wine grape varieties that can avoid early frost damage in the eastern foothills of the Helan Mountain Region of Ningxia and possess specific high-quality phenolic profiles,to address the problem of insufficient phenolic accumulation and limited quality caused by early frost harvesting in this region,and to elucidate the regulatory effects of bud mutation-induced veraison shifts on fruit quality and non-anthocyanin phenolic metabolism.This study took the red wine grape Cabernet Franc from the Helan Mountain Eastern Foot production area in Ningxia as experimental materials.Three bud sport strains(early-maturing,mid-early-maturing,and late-early-maturing)were screened,and differences in their fruit quality and non-anthocyanin phenolic compounds were systematically compared.The results showed that the early-maturing strain exhibited a'large berry and high phenolic content'phenotyp,the vertical and horizontal diameters of single berries increased by 22.9％and 17.5％,respectively,while the contents of total phenols,tannins,and anthocyanins surged by 158.2％,169.8％,and 60.9％,respectively.However,its cluster weight decreased by 37.7％.The mid-early-maturing strain showed a'heavy cluster and high sugar-acid content'trait,with cluster weight,sugar content,and acid content increasing by 18.7％,13.4％,and 57.1％,respectively.Bud sport induced specific reconstruction of phenolic metabolism,the contents of key monomers epicatechin gallate and resveratrol increasing by 89.2％and 57.6％,respectively,and myricetin content soaring by 159.7％.In contrast,the total content of phenolic acids,as well as the contents of rutin and protocatechuic acid,decreased by 19.2％,44.8％,and 48.1％,respectively.The total flavonol contents in the mid-early-maturing and late-early-maturing strains decreased by 25.9％and 34.4％,respectively,with the reduction in total phenolic compounds reaching 9.7％and 12.9％.In conclusion,The veraison shift driven by bud mutation has precisely regulated the allocation of phenolic metabolism,clarified the quality and phenolic characteristics of different early-ripening bud mutant strains,and provides a direct theoretical basis and material selection targets for the breeding of new early-frost-resistant,high-quality wine grape varieties and the development of functional wines in the eastern foothills of the Helan Mountain Region of Ningxia.