Grapevine Diversity and Genetic Relationships in Northeast Portugal Old Vineyards.

More than 100 grapevine varieties are registered as suitable for wine production in "Douro" and "Trás-os-Montes" Protected Designations of Origin regions; however, only a few are actually used for winemaking. The identification of varieties cultivated in past times can be an important step to take advantage of all the potential of these regions grape biodiversity. The conservation of the vanishing genetic resources boosts greater product diversification, and it can be considered strategic in the valorisation of these wine regions.

Chitosan Upregulates the Genes of the ROS Pathway and Enhances the Antioxidant Potential of Grape ( L. 'Touriga Franca' and 'Tinto Cão') Tissues.

Chitosan is an environmentally-friendly active molecule that has been explored for numerous agricultural uses. Its use in crop protection is well-known, however, other properties, such as bioactivity, deserve attention. Moreover, the modes of actions of chitosan remain to be elucidated.