Impact of Application of Abscisic Acid, Benzothiadiazole and Chitosan on Berry Quality Characteristics and Plant Associated Microbial Communities of Vitis vinifera L var. Mouhtaro Plants

The phenolic profile of the grape berries is a key quality factor for red grapevine varieties and several techniques have been applied to improve it. An innovative technique application resistance elicitors phytohormones. In present study, leaves Greek indigenous variety (Mouhtaro) sprayed with two elicitors, benzothiadiazole chitosan plant hormone abscisic acid, during veraison. Physicochemical characteristics microbial communities rhizosphere, phyllosphere carposphere were analyzed at harvest. Differences in on different compartments observed after activators. Chitosan treatment increased abundance beneficial lactic acid bacteria, while decreased presence spoilage fungi carposphere. Treatments differentiate total phenolics, anthocyanins chemical must treated grapes had skin-derived phenolics that correlated positively taxa was discriminant by LefSe analysis. This research provides an overview effect activators ecology Mouhtaro presents potential new approaches field sustainable viticulture.