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Research insights arising from the sciences of Viticulture, Enology and Vitivinicultural Economy are crucial for responding to an everincreasing set of challenges - such as climate change, environmental issues and a global and more competitive market - faced by the players in the vitivinicultural sector. In this context, the scientific journals play a key role in spreading the knowledge acquired worldwide and contributing to the generation of new ideas and new research lines. The Ciência e Técnica Vitivinícola is one of the oldest and few scientific journals specifically devoted to these three branches of science. In 2020, twelve articles from several international research teams were published, covering a wide range of current topics, including: sustainability of viticulture and winemaking; modelling of climate impact on wine production; control of pests and diseases; management and adaptability of grapevine varieties; quality and differentiation of wine based on minority grapevine varieties, native yeasts from grapevine and winemaking technologies; wine authenticity and traceability; botrytized wines; human resource management in small wine companies.

ABSTRACT Introduction Graft incompatibility of Vitis spp is an unresolved worldwide problem with important economic consequences. Grafting comprises a complex set of morphological and physiological alterations, in which the phenolic compounds seem to be strongly involved. Therefore, a detailed analysis and recognition of structural phenolic compounds diversity in the two partners of a Vitis graft is of great importance to evaluate their role as markers of graft establishment. Objective To optimise a sample extraction method, and to develop and validate a high-performance liquid chromatography (HPLC) method for the simultaneous determination of phenolic acids and flavonols in the graft union so as to understand their behaviour in the metabolism of the scion-rootstock system, using compatible and incompatible combinations of a Syrah cultivar and two rootstocks (R110 and SO4). Methods Sixty extracts of Vitis grafting tissues were prepared and analysed by HPLC for the qualitative and quantitative determination of their phenolic profile. Results Among the phenolic compounds identified in the samples, one benzoic acid (gallic acid), three cinnamic acids (caffeic acid, ferulic acid and sinapic acid) and two flavonols (catechin and epicatechin) are potentially suitable as markers of graft incompatibility. Conclusion The method developed presents good performance and lends itself readily for application in routine analysis of the phenolic composition of Vitis grafting tissues to distinguish compatible and incompatible combinations in the graft callusing stage. Copyright © 2014 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]

Grapevine (Vitis vinifera L.) is the most important fruit crop in Portugal. Associated with a long history of wine production, there is also a significant diversity and richness in the Portuguese germplasm, both in the cultivated subspecies vinifera as well as in wild vine populations, (subspecies sylvestris). In the second half of the nineteenth century pest management became one of the main tasks in European viticulture after the introduction of the fungal pathogens causing powdery and downy mildew. Atlantic climate areas in Portugal may need up to 10 treatments per season to control these diseases. One of the most promising approaches to control these diseases is to introgress resistance traits relying on the breeding of new grapevine varieties. A number of crosses between Portuguese varieties well adapted to the local terroir and with high enologic importance (Arinto, Fernão Pires and a Touriga Nacional) and varieties with known resistance (Chambourcin, Regent and two lines A and B of resistant grapevine varieties) were carried out in 2018 and 2019. More than 3000 seeds were obtained, these were germinated in 2020 at control condicions (temperature, humidity and light) in the greenhouse. During the 2021 growing season theses progenies were challenged with downy mildium (near 30000 sporangia ml-1concentration, spread on lower suface of leafs) and with powdery mildium (direct brusch strocks on upper suface of leafs). Both challenges were done in the absence of Phytosanitary treatments at two growing stages (Baggiolini scale E and I). Only tolerante plants will be further studied, so far we have 239 progenies. As future perspective these new varieties will be screened with identified locus that identify the genetic profile of these grapevine varieties and check the correct progenitors. Additionaly resistant locus identified in the used progenitors, hermaphroditism flower and berry skin color will to be used to select the new grapevine varieties to be used on wine production or in new backcrosses in order to obtain F2 varieties. [ABSTRACT FROM AUTHOR]