Agronomic and physiological behavior of two Portuguese grapevine cultivars in distinct climatic sub-regions of Douro (Portugal)
Artigo de Conferência
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resumo
The agronomic and physiological behaviour of the Portuguese grapevine cultivars Touriga Nacional and Touriga Franca (Vitis
vinifera L.), were 3810-193 studied under distinct climatic conditions across Douro valley in the Demarcated Region of Douro
- Portugal. The Douro region is divided into three climatic sub-regions: Baixo Corgo, Cima Corgo, and Douro Superior whose
weather characteristics are presented and discussed in this study. In the Douro valley, low precipitation values along with
high temperatures and high radiation exposure give rise to situations of intense summer water and thermic stress. These
conditions are particularly more severe in the Cima Corgo and Douro Superior sub-regions.
The main objective of this study was to characterize the agronomic and physiological response of the cultivars Touriga
Nacional and Touriga Franca growing under natural rainfed field conditions, during 2017 growing season.
The experiment was conducted in commercial vineyards located in the Demarcated Douro Region (RDD). Three study areas
were considered in this study: (i) Baixo Corgo (BC): Quinta da Pacheca in Régua (Lat. 41°08'28.8"N, Long. 7°49'01.2"W,
elevation 136 m); Cima Corgo (CC): Quinta do Porto in Pinhão (Lat. °10'21.1"N, Long. 7°34'13.8"W, elevation 174 m) and
Douro Superior (DS): Quinta da Leda in Almendra (Lat. (41°01'31.6"N, Long. 7°00'55.7"W, elevation 235 m). Physiological
(stem water potential, stomatal conductance, net CO2 assimilation rate, transpiration rate and intrinsic water use efficiency)
and agronomic (leaf area index (LAI); pruning weigh, productivity and berry composition) parameters were monitored on
vines of both cultivars, growing under different summer water stress conditions: severe (DS) moderate (CC) and weak (BC).
