AUTHOR=Li Xueyao , Li Tinggang , Li Minmin , Chen Deyong , Liu Xiaowei , Zhao Shanshan , Dai Xiaofeng , Chen Jieyin , Kong Zhiqiang , Tan Jianxin 

TITLE=Effect of Pathogenic Fungal Infestation on the Berry Quality and Volatile Organic Compounds of Cabernet Sauvignon and Petit Manseng Grapes

JOURNAL=Frontiers in Plant Science

VOLUME=Volume 13 - 2022

YEAR=2022

URL=https://www.frontiersin.org/journals/plant-science/articles/10.3389/fpls.2022.942487

DOI=10.3389/fpls.2022.942487

ISSN=1664-462X

ABSTRACT=The effect of pathogenic fungal infestation on berry quality and volatile organic compounds (VOCs) of Cabernet Sauvignon and Petit Manseng were investigated by using biochemical assays and gas chromatography-ion mobility spectrometry. No significant difference in diseases-affected grapes for 100-berry weight. The content of tannins and vitamin C decreased significantly in disease-affected grapes, most in white rot-affected Petit Manseng, which decreased by 71.67% and 66.29%. The reduced total flavonoids content in diseases-affected grape, among which the least and most were anthracnose-affected Petit Manseng (1.61%) and white rot-affected Cabernet Sauvignon (44.74%). All diseases-affected Cabernet Sauvignon had much higher titratable acid, a maximum (18.86 g/100 mL) was observed in the gray mold-affected grapes, and only anthracnose-affected grapes with a higher titratable acid level (21.8 g/100 mL) in Petit Manseng. A total of 61 VOCs were identified, including 14 alcohols, 13 esters, 12 aldehydes, 4 acids, 4 ketones, 1 ether, and 13 unknown compounds, which were discussed from different functional groups, such as C6-VOCs, alcohols, ester acetates, aldehydes, and acids. The VOCs of Cabernet Sauvignon changed more than Petit Manseng after infection and gray mold-affected Cabernet Sauvignon changed most. C6-VOCs, including hexanal and (E)-2-hexenal were decreased in all affected grapes. Some unique VOCs may serve as hypothetical biomarkers to help us identify specific varieties of pathogenic fungal infestation.