Mycorrhizal Fungi Enhance Yield and Berry Chemical Composition of in Field Grown Cabernet Sauvignon Grapevines (V. vinifera L.)

The aim of this study was to assess the influence of the application of mycorrhizal fungal inoculum on Cabernet Sauvignon (Vitis vinifera L.) leaf gas exchange, yield parameters, as well as grape berry composition, especially regarding phenolic compounds. The experiment was conducted over two years under natural vineyard conditions of the Zagreb wine-growing area, the continental region of Croatia. Cabernet Sauvignon grapevines were grafted on SO4 rootstock, both being commonly used in all wine production areas in Croatia. Results obtained demonstrated that symbiotic grapevines, in general, expressed improved leaf gas exchange parameters and higher yield parameters, especially regarding the number of clusters per vine. It should be emphasized that mycorrhizal fungi affected higher total flavan-3-ols, total anthocyanins, and total polyphenols in berry skin in both experimental years. Despite variation in some yield parameters, generally, it is possible to obtain higher yields together with the improved phenolic composition of grapes.

Automated summary

The study assessed the influence of mycorrhizal fungal inoculum on Cabernet Sauvignon grape leaf gas exchange, yield parameters, and grape berry composition, particularly phenolic compounds. Results showed that symbiotic grapevines demonstrated improved gas exchange and higher yields, especially in terms of cluster numbers. Mycorrhizal fungi led to higher levels of certain phenolic compounds in the grape berry skin, suggesting potential benefits for both yield and phenolic composition.