Fungal grapevine trunk diseases (GTDs) are some of the most pressing threats to grape production worldwide. While these diseases are associated with several fungal pathogens, and are important contributors to esca and Petri diseases. Recent research has linked grapevine xylem diameter with tolerance to in commercial rootstocks. In this study, we screen over 25 rootstocks for xylem characteristics and tolerance to both and . Tolerance was measured by fungal incidence and DNA concentration (quantified via qPCR), while histological analyses were used to measure xylem characteristics, including xylem vessels diameter, density, and the proportion of the stem surface area covered by xylem vessels. Rootstocks were grouped into different classes based on xylem characteristics to assess the potential association between vasculature traits and pathogen tolerance. Our results revealed significant differences in all the analyzed xylem traits, and also in DNA concentration for both pathogens among the tested rootstocks. They corroborate the link between xylem vessels diameter and tolerance to . In , the rootstocks with the widest xylem diameter proved the most susceptible. This relationship between vasculature development and pathogen tolerance has the potential to inform both cultivar choice and future rootstock breeding to reduce the detrimental impact of GTDs worldwide.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8546399PMC
http://dx.doi.org/10.3389/fpls.2021.726461DOI Listing

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