Dissertations / Theses on the topic 'Vine canopy'

In 2009 and 2010 a split, split, split plot experiment with training system, VSP or Smart-Dyson Ballerina (main plot), N, 0 or 33.6 kg/ha (split), crop level, 14.0, 18.7, or 23.4 clusters/m/canopy (split), clone, Cabernet Franc 1,4, 8 and 214 treatments with five replications were established in Union County, Illinois on mature vines. The Smart-Dyson Ballerina training system produced a Ravaz index that was 89% and 28% bigger compared to the VSP respectively in 2009 and 2010. In 2009, the Smart-Dyson Ballerina produced a 80% bigger yield than VSP and in 2010 yield was also larger, but influenced by both training system and crop level. Maintaining a balanced vineyard can increase profit for the grower by up to $6,356.87/ha.

The influence of soil texture on canopy growth, vine yield, and fruit composition of Sauvignon blanc were assessed on a mature vineyard from the Rapaura area in Marlborough. The subject vines were mature Sauvignon blanc in a commercial vineyard trained to four cane VSP and planted with a north south orientation. Row and vine spacings were typical of the area at 3m x 1.8m. Four areas of different soil texture were identified using trunk circumference measurements, visual assessment of the surface soil and aerial photographs to identify changes in vine growth. Soil pits were excavated at a later date to determine root numbers and record the soil texture in the different areas. Two crop treatments were imposed on half of the plots at approximately 50% veraison: unthinned crop and 50% crop. A shading treatment was also imposed at 50% veraison where three sets of tagged shoots had bunches that were exposed to sunlight, bunches that had some natural shading from leaves or bunches that had paper bags fastened over each to provide a completely shaded environment. Vine vegetative vigour for each plot was assessed during the growing season using the Point Quadrat method and at pruning using bud counts and pruning weights. Thirty berry samples were collected from the 32 plots and analysed weekly for soluble solids and berry weight. Harvest of bunches from the tagged shoots occurred on two different dates with the first harvest picked when fruit from one soil and crop treatment had reached 21 °Brix. The second picking took place just before the commercial harvest, which coincided with last soil and crop treatment reaching 21 °Brix. Bunches from each tagged shoot were weighed, frozen and later analysed for soluble solids, pH, organic acids, and methoxypyrazines. Vines on very stony textured soils had small trunk circumferences with a high root density and yield to pruning weight ratio compared to those growing on deep silt soils. Vines on deep silt soils had more vigorous canopies with large shoots and a higher leaf layer number. The target soluble solids was reached first by the vines on the very stony plots despite the higher crop load with soil texture appearing to be a dominant factor by influencing the time of flowering. Cluster shading decreased soluble solids, consistent with other studies, whilst crop thinning resulted in an earlier harvest. This was contrary to popular opinion that crop thinning at veraison would have no impact on sugar accumulation. pH and organic acids were unaffected by shading or bunch thinning. Vines growing on deep silt soils had a significantly higher level of total acidity and malic acid than those on the stony soils. At harvest, methoxypyrazine levels were very low compared to previously reported figures for Marlborough, which may have been a result of sample preparation. IBMP was significantly higher on deep silt soils, however, with no impact from the shading or crop treatment. The findings are consistent with the hypothesis that IBMP synthesis may be increased by the number of leaves surrounding bunches (Roujou de Boubee, 2003). The results suggest that soil texture plays a dominant role in influencing Sauvignon blanc flavour and aroma and due consideration should be given to vineyard layout and site selection prior to new plantings taking place.

In organic and biodynamic vineyards, canopy management practices should be carefully and timely modulated, particularly in a context of climate change, for successfully achieving balanced plants, ventilated and exposed berries, elevated grape and wine quality. In 2013 and 2014, characterized by contrasting climatic conditions, the implications of post-veraison (late) or pea-size trimming, post-veraison or pre-harvest late defoliations and shoot-positioning (post-veraison) were assessed against long-shoots non treated controls, under field conditions on organically-cultivated cv. Sangiovese. The key agronomic and enological relevance of late trimming and defoliations clearly emerged in both seasons. Berry skin phenolics (e.g. anthocyanins, flavonols) increased markedly, without changes in technological parameters. In case of early trimming, such positive effects were observed only in 2013. Maintaining long shoots for shading decreased anthocyanins, flavonols and total phenolics concentrations and promoted the production of compact bunches. Experimental data strongly designated late trimming, a practice proved to contain yield and bunch compactness, as a valuable alternative to cluster thinning. Late trimming, defoliations and shoot positioning reduced the severity of Botrytis cluster rot. The highest levels of berry skins phenolic compounds in late trimmed and defoliated plants could have contributed control the severity of this pathogen. The enological benefits induced by late trimming and defoliations and shoot positioning emerged in both young and aged wines. For the first time, cell cultures from cv. Sangiovese berry tissues were obtained and enabled to investigate, in controlled conditions, the relations between mechanisms regulating secondary metabolism in grapevine cells and changes induced by environmental and agronomic factors. The Doctoral Dissertation strongly highlights the need to consider, for a proper interpretation of the multiple modifications induced by canopy management strategies, physiological mechanisms other than the canonic source-sink relationships, in particular their impact on the vine hormonal status.

In organic and biodynamic vineyards, canopy management practices should be carefully and timely modulated, particularly in a context of climate change, for successfully achieving balanced plants, ventilated and exposed berries, elevated grape and wine quality. In 2013 and 2014, characterized by contrasting climatic conditions, the implications of post-veraison (late) or pea-size trimming, post-veraison or pre-harvest late defoliations and shoot-positioning (post-veraison) were assessed against long-shoots non treated controls, under field conditions on organically-cultivated cv. Sangiovese. The key agronomic and enological relevance of late trimming and defoliations clearly emerged in both seasons. Berry skin phenolics (e.g. anthocyanins, flavonols) increased markedly, without changes in technological parameters. In case of early trimming, such positive effects were observed only in 2013. Maintaining long shoots for shading decreased anthocyanins, flavonols and total phenolics concentrations and promoted the production of compact bunches. Experimental data strongly designated late trimming, a practice proved to contain yield and bunch compactness, as a valuable alternative to cluster thinning. Late trimming, defoliations and shoot positioning reduced the severity of Botrytis cluster rot. The highest levels of berry skins phenolic compounds in late trimmed and defoliated plants could have contributed control the severity of this pathogen. The enological benefits induced by late trimming and defoliations and shoot positioning emerged in both young and aged wines. For the first time, cell cultures from cv. Sangiovese berry tissues were obtained and enabled to investigate, in controlled conditions, the relations between mechanisms regulating secondary metabolism in grapevine cells and changes induced by environmental and agronomic factors. The Doctoral Dissertation strongly highlights the need to consider, for a proper interpretation of the multiple modifications induced by canopy management strategies, physiological mechanisms other than the canonic source-sink relationships, in particular their impact on the vine hormonal status.

The influence of rootstock and canopy density on grape berry composition was investigated over the summer of 2003-2004 on a commercial vineyard at Waipara, North Canterbury. This experiment was designed to investigate the influence of rootstock and canopy density on the acid composition, potassium (K) content and final pH of harvested fruit (Pinot Noir AM 10/5 Lincoln Selection). The trial block consisted of eight rootstocks laid out to an 8 x 8 latin square, each plot consisting of five vines of the same rootstock. Two canopy treatments were overlaid the block (down whole rows, assigned randomly, four rows to each treatment); one treatment allowed to grow naturally, in the other treatment the canopy was thinned removing double burst shoots and laterals. The bunch numbers were adjusted in the Unthinned canopy treatment (UCT) to match the Thinned canopy treatment (TCT). Information was gathered to assess: the canopy size and density (Pinot Quadrat Leaf Layer and Percent Gaps and canopy porosity), the plant yield (and berry size, berries per cluster, cluster weight, clusters per plant), plant K levels at flowering and veraison (from petioles and leaf blades) and berry composition at harvest (soluble solids (as brix), K, titratable acidity (TA), tartaric acid concentration, malic acid concentration and pH). The trial area was non-irrigated on clay loam soils and viticultural management was to best commercial practice. It was found that although rootstock influenced the levels of K in the plant and in the juice at harvest, the level of K in the juice did not influence pH in this experiment (range of rootstock juice K: 808 ppm to 928 ppm, l.s.d. = 75 ppm). The level of tartaric acid concentration in the juice was found to be the dominant influence on the level of pH in this experiment (rootstock pH range: 3.21 to 3.39, l.s.d. = 0.05). The juice concentration of tartaric acid was influenced by both rootstock (rootstock range 4.0 to 4.7 g/L, l.s.d = 0.4) and canopy density (UCT = 4.1, TCT = 4.7, l.s.d. = 0.4), decreased shading positively increasing the level of tartaric acid. The malic acid concentration in the juice was positively influenced by increasing canopy density (UCT = 4.7 g/L, TCT = 4.1 g/L, l.s.d = 0.4) and this played a minor role in the determination of pH in this experiment; an influence of rootstock on the level of malic acid concentration was found. The malic acid concentration strongly influenced the determination of TA (UCT = 11.0 g/L, TCT = 10.2 g/L, l.s.d = 0.5); tartaric acid concentration had a minor influence on the recorded TA. Attempts to characterise the influence of rootstock on malic acid, tartaric acid and pH were inconclusive. Rootstock was found to influence the canopy variables measured in this experiment and the recorded average plant yield. Crosses of Vitis rupestris were found to exhibit the most canopy vigour and those derived from Vitis berlandieri and Vitis riparia the least. The Canopy treatment did not show an influence over yield but the rootstock was found to influence plant yield, through the numbers of berries set in a cluster and the final harvest cluster weight. The influence of rootstock on pH may be described by the influence it exerts on canopy growth and yield but this was thought unlikely. Further research is required to describe the nature of the rootstock influence on K, malic acid, tartaric acid and pH.

<p>This Master’s thesis studies the possibility of using image processing as a tool to facilitate vine management, in particular shoot counting and assessment of the grapevine canopy. Both are areas where manual inspection is done today. The thesis presents methods of capturing images and segmenting different parts of a vine. It also presents and evaluates different approaches on how shoot counting can be done. Within canopy assessment, the emphasis is on methods to estimate canopy density. Other possible assessment areas are also discussed, such as canopy colour and measurement of canopy gaps and fruit exposure. An example of a vine assessment system is given.</p>

Les changements climatiques mondiaux ont déjà affecté et continueront d’affecter la physiologie de la vigne, en particulier le rendement et la composition des baies à la récolte, et donc, en définitive, la qualité et la typicité des vins produits. Parmi les différentes stratégies possibles d’adaptation de la viticulture au changement climatique (modifications de l’encépagement, création de nouvelles variétés mieux adaptées aux conditions futures,...), le contrôle de la composition des baies à la récolte par le biais d’une modification des pratiques culturales et notamment par des manipulations de la canopée (rapport feuilles/fruits (Fe/Fr), manipulation de l’exposition des grappes, échardage) est certainement celle qui serait la plus rapide à mettre en œuvre.Ma thèse a pour but de rechercher le meilleur point de compromis entre diminution du taux de sucres et maintien de l’acidité, de l’accumulation des composés phénoliques et d’une complexité aromatique proche de l’actuelle, en réponse aux manipulations de canopée (rapport Fe/Fr, échardage) couplées ou non à l’application d’acide abscissique (ABA).Différents ratio Fe/Fr ont ainsi été étudiés sur le cépage d’étude Cabernet-Sauvignon en conditions semi-contrôlées en serre sur boutures fructifères puis au vignoble au sein d’une parcelle de production. L’analyse de la composition des baies en métabolites primaires et secondaires, réalisée lors de ces deux expériences, a permis de déterminer que le ratio 6 feuilles restantes par grappe était la valeur seuil en dessous de laquelle un effet sur les métabolites primaires est visible. Une diminution du taux de sucres a notamment été observée, également associée à la diminution de la concentration en anthocyanes totales qui sont particulièrement importantes dans la définition de la typicité des vins de Bordeaux. L’application d’ABA exogène sur les baies avant la véraison a permis de diminuer les effets négatifs de la modification du ratio Fe/Fr sur l’accumulation des anthocyanes et n’a pas montré d’impact sur la typicité des vins lors des dégustations des microvinifications réalisées au cours de cette étude. Ces résultats analytiques obtenus ont été couplés à des analyses transcriptomiques de type RNAseq et PCR quantitative en temps réel (Fluidigm) afin d’identifier les gènes clefs associés au voies métaboliques primaires et secondaires réagissant aux modulations du ratio Fe/Fr couplées ou non à l’ajout d’ABA. Ainsi, le couplage modulation du ratio Fe/Fr et application d’ABA exogène sur les baies serait une méthode potentiellement utilisable afin de réduire le taux de sucres et de maintenir une typicité bordelaise proche de l’actuelle.La caractérisation fonctionnelle d'un gène potentiellement associé à la voie de biosynthèse des méthoxypyrazines, impliquées dans le caractère végétal du raisin et du vin, a également été mise en œuvre. Différentes approches ont été testées et ont fourni des indices utiles, cependant les résultats obtenus sont encore en cours de confirmation<br>Global climate changes have already affected and will continue to affect the physiology of grapevine, in particular the yield and berry composition at harvest, and thus ultimately the quality and typicality of the wines produced. Among the different possible strategies of adapting viticulture to climate change (changes varieties, creation of new varieties better adapted to future conditions,...), modulating berry composition at harvest through changing cultural practices, such as manipulations of the canopy (leaf / fruit ratio, grape exposure), may be a fast and efficient option as a short-term adaptation strategy.My thesis aims to find the best point of compromise between reducing the sugar level and, maintaining the acidity, phenolic compounds, and the aromatic complexity by the canopy manipulations (leaves / fruits ratio, secondary shoot removal), coupled or not with the application of abscisic acid.Different leaf / fruit ratios were studied on the Cabernet-Sauvignon cultivar in greenhouse and in vineyard within a plot of production. The berry composition analysis of primary and secondary metabolites, performed in these two experiments, made it possibleto determine that the ratio of 6 leaves remaining per cluster was the threshold value below which an effect on the primary metabolites is visible. A decrease in the sugar content was especially observed, also associated with a decrease in the concentration of total anthocyanins which are particularly important in the definition of the typicality of Bordeaux wines. The application of exogenous abscisic acid to the berries before veraison permitted to reduce the negative effects of the modification of the leaf-to-fruit ratio on the accumulation of anthocyanins and did not affect the typicality of the wines during the tastings of the microvinifications carried out during this study. These analytical results were coupled with transcriptomic analyses of RNAseq and real-time quantitative PCR (Fluidigm) to identify key genes associated with the primary and secondary metabolic pathways reacting to modulations of leaf-to-fruit ratio coupled or not with the addition of abscisic acid.Thus, the coupling modulation of the leaf-to-fruit ratio to the application of exogenous abscisic acid on the berries would be a usable method to reduce the sugar content and maintain a typicality of Bordeaux wines close to the current one.The functional characterization of a gene potentially associated with the biosynthetic pathway of methoxypyrazines, which are involved in vegetable character of grapes and wine, was also conducted. Different approaches have been tested and provided useful clues but the conclusive results are still under further confirmation

Le travail de recherche présenté concerne l'étude des pulvérisations de produits phytosanitaires. Les études réalisées au début de ma carrière (ma thèse et les travaux qui en ont découlé) concernent le développement, la validation puis le transfert d'un modèle de calcul de la répartition des dépôts au sol, pour des pulvérisateurs à rampe. Ce travail a servi de base à la définition des méthodologies mises en place par la suite.<br />L'étude de la pénétration de la pulvérisation dans la vigne a ensuite été étudié. Un modèle a été développé à l'aide d'outils commerciaux de CFD pour la représentation du flux d'air dans la végétation et le calcul de trajectoires représentatives de gouttes. Le modèle a été paramétré à partir de mesures de vitesses d'air de part et d'autre de la canopée. Le comportement des nuages de gouttes et la proportion de produit retenue par le feuillage a été développé de manière plus détaillée : le modèle s'appuie sur un coefficient d'efficacité obtenu à partir d'autres simulations. Ces simulations ont été conçues de manière à permettre une<br />validation expérimentale. Les mesures de dépôt réalisées en conditions réelles ont ensuite permis de discuter des résultats du modèle global ainsi que des limites de l'approche.<br />Enfin des contaminations atmosphériques pendant les applications ont fait l'objet d'une démarche expérimentale pour mettre en évidence les relations entre les variables météorologiques, les paramètres-machine et les émissions de pesticide. L'analyse par des systèmes d'inférence floue ont débouché sur une proposition d'outil d'expertise. Un modèle dédié a par ailleurs été développé pour simuler les quantités émises ainsi que leur dispersion atmosphérique.

Ce travail propose une méthodologie pour l'analyse du fonctionnement global d'un système HPP ainsi qu'une étude théorique et expérimentale des systèmes commutateur à plasma (POS), schéma LL et Compression de Flux. Une modélisation analytique des phases de fonctionnement est donnée pour évaluer leur rendement et les comparer. En s'appuyant sur un développement de la MHD Hall et sur un modèle de distribution du plasma, l'étude POS expose les modes de pénétration de B pendant la conduction et la transition vers la physique de l'ouverture. L'analyse des essais LL montre des spécificités (configuration de B, pertes) et conduit à un modèle électrique complet. L'usage du modèle analytique pour l'étude des essais CF révèle la circulation du courant dans l'épaisseur du plasma et son impact sur l'efficacité du schéma. Enfin, les performances des futures machines sont traduites en caractéristiques spécifiques aux schémas et comparées à l'expérience pour aborder leur viabilité et les travaux à venir.

Des voyageurs du commerce des fourrures provenant de la vallée du Saint-Laurent se sont installés à Ste-Geneviève, en Haute-Louisiane, durant le XVIIIe siècle. Ils y connurent des destins sociaux et économiques diversifiés et complexes. Située sur le bord du Mississippi, près de St-Louis, Ste-Geneviève était le premier établissement français à l’ouest du Mississippi. Tout comme en Nouvelle-France, un monde francophone continua d’exister en Louisiane longtemps après le Traité de Paris de 1763, bien que la colonie soit devenue une possession espagnole. Les archives notariales et les registres paroissiaux de Ste-Geneviève ont permis d’identifier 55 voyageurs. Une fois arrivés à Ste-Geneviève, ils adoptaient un mode de vie sédentaire. Il a été possible de constater que les destins sociaux des voyageurs avaient été diversifiés et complexes en étudiant leurs alliances matrimoniales, leur descendance, leurs liens familiaux dans le pays des Illinois et leur activité dans la communauté, aux niveaux religieux et administratif. Leurs destins économiques étaient également diversifiés et complexes, tant au niveau des activités économiques pratiquées qu’au niveau de la quantité de biens accumulée. Ainsi, en plus de pratiquer l’agriculture, le commerce, l’artisanat, la chasse et/ou le voyage, la plupart d’entre eux continuaient à être impliqués dans le commerce des fourrures. La réussite attendait certains, alors que d’autres ne purent éviter l’échec.

La photoemission inverse analyse les photons emis lors de transitions radiatives entre deux etats electroniques inoccupes, que peuvent subir des electrons penetrant dans un solide. Dans le domaine 10-25 ev, avec des electrons incidents ayant un vecteur d'onde bien defini, on peut acceder aux structures de bandes des etats d'energie electroniques inoccupes; c'est la photoemission inverse resolue angulairement. Ce rapport presente la construction et la mise au point d'un appareillage devant permettre de telles experiences; elles necessitent l'emploi d'un analyseur de photons et d'une source d'electrons. Le spectrometre pour ultraviolet a vide, analysant les photons emis, comprend deux elements: le reseau de diffraction et la multidetection de photons. Son principe de fonctionnement est la simple rotation du reseau. La partie analyse est realisee avec un canon a electrons donnant une resolution angulaire de 0,2 a##1 dans la gamme 10-25 ev. La conception de l'appareil et des systemes internes, ainsi que leur realisation et les reglages de mise en place sont presentes. La mise en route de l'appareillage commence d'abord par un etalonnage du spectrometre, c'est-a-dire un etalonnage du mecanisme bras sinus controlant la rotation du reseau. Il faut egalement proceder a des reglages sur le canon a electrons: electriques et de position. Ensuite, des experiences de photoemission inverse resolue angulairement ont ete realisees sur un echantillon monocristallin de nickel (100) a une energie de 24 ev

Sous le signe du Tau, est une recherche à la croisée de l’histoire religieuse, hospitalière et sociale. La fraternité laïque qui naquit à Saint-Antoine sous l’impulsion de deux nobles, Gaston et Guérin à la fin du XIe siècle, fit de l’hospitalité sa vocation première et des reliques du saint, l’essence de son existence. La tutelle de l’abbaye de Montmajour, sous laquelle la fraternité était placée, n’entrava pas son expansion et la petite communauté fut rapidement à la tête d’un réseau de dépendances étendu. Dans un contexte de régularisation de la vita religiosa, Innocent IV transforma ce premier mouvement confraternel en ordre canonial en 1247. Érigée en abbaye et soustraite de la tutelle des Bénédictins de Montmajour par Boniface VIII en 1297, Saint-Antoine devint progressivement une puissance politique et religieuse au cœur du Dauphiné et de la Savoie. Entre pratiques liturgiques, dévotionnelles et hospitalières, les chanoines de Saint-Antoine développèrent un propositum vitae spécifique, une voie médiane au sein des chanoines réguliers. Pleinement insérés dans la société féodale, leur engagement auprès des dauphins, des rois de France et des ducs de Savoie contribua à l’émergence de nouveaux réseaux aristocratiques locaux. Sous le signe du Tau s’écrivait ainsi l’histoire d’une vocation originelle au prisme des mutations de la société féodale<br>Marked by the Tau, is a research at the crossroads of religious, hospitable and social history. The lay fraternity which was born in Saint-Antoine under the impulse of two noblemen, Gaston and Guérin at the end of the eleventh century, made hospitality its primary vocation and relics of the saint, its essential purpose. Placed under the tutelage of the Abbey of Montmajour, this relationship did not hinder its expansion and the little fraternity was quickly at the head of an extensive network of dependencies. In a context of regularisation of the vita religiosa, Innocent IV transformed this first fraternal movement into a canonical order in 1247. Erected as an abbey and withdrawn from the tutelage of the Benedictines of Montmajour in 1297 by Boniface VIII, Saint-Antoine gradually became a political and religious power in the heart of the Dauphiné and Savoy. Between liturgical, devotional and hospitable practices, the canons of Saint-Antoine developed a specific propositum vitae, a middle path within the regular canons. Fully integrated into feudal society, their commitment to dauphins, kings of France and dukes of Savoy contributed to the emergence of new local aristocratic networks. Marked by the Tau is thus written the story of an original vocation struggling with the changes in feudal society

La révélation d’abus dans l’Église invite à une quête de vérité sur la gestion de l’autorité et de la transparence dans les congrégations féminines en Mésopotamie. Parler d’abus de pouvoir s’imposait. Les normes canoniques et textes du Magistère invitent les communautés religieuses à une application juste du droit en respectant la dignité de la personne humaine. De même, un changement de regard sur les femmes dans les pays arabo-musulmans, dans la société irakienne en particulier, et dans l’Église s’avère une nécessité urgente. Les résultats obtenus dans ce travail de recherche suggèrent une réforme et un renouvellement de l’identité de la vie religieuse en Irak en vue d’une meilleure gestion des vocations dans l’avenir. La vie religieuse exerce un rôle important dans ce pays qui a besoin de se reconstruire humainement, spirituellement et fraternellement pour retrouver les valeurs de paix, de justice, de réconciliation et de solidarité. L’intérêt de ce sujet ne se limite pas aux congrégations féminines de l’Irak mais s’adresse à tous les consacrés dans l’Église<br>The revelation of abuse in the Church invites a search for the truth about the management of authority and transparency in female congregations in Mesopotamia. To speak about the abuse of power has become necessary. Canonical norms and the teachings of the Magisterium of the Church invite religious communities to a fair application of the law while respecting the dignity of the human person. Likewise, a change of mentality about women in Arab-Muslim countries, in the Iraqi society in particular, and in the Church as a whole is urgently needed. The results of this research work suggest the need for a reform and renewal of the identity of religious life in Iraq with the view to better manage vocations in the future. Religious life plays an important role in this country which is in need of rebuilding itself humanely, spiritually and fraternally in order to rediscover the values of peace, justice, reconciliation and solidarity. The interest of this subject is not limited to women’s congregations in Iraq alone but is directed to all consecrated persons in the Church

Mestrado de dupla diplomação com a UTFPR - Universidade Tecnológica Federal do Paraná<br>A worldwide relevant winemaking place, the Douro Demarcated Region, located in Northeast Portugal, is characterized by its Mediterranean climate, with a marked water deficit in the summer period and high temperatures. This aspect may reduce vineyards’ productivity and quality. Within the scope of this master’s thesis, this study proposed to understand the vineyard relations with the climate changes at the Douro Demarcated Region, establishing three different levels of deficit irrigation (25, 50, and 75% ETc) and two control fields (non-irrigated). Besides the water stress condition, plants were trained in different canopy heights (tall and short) to understand its influence on physiological and agronomical parameters. Evaluation of evapotranspiration (ETc), predawn water potential, NDVI, CCI, leaf gas exchange, and leaf area took place throughout veraison. To control maturation, weight, diameter, and chemical characteristics of berries were measured. At harvest, FTIR proceded chemical characteristics of the must. Pruning weight and Ravaz index completed yield evaluations. The results of this research corroborate with previous studies, indicating that rainfed vines can have a lower yield at harvest than the ones irrigated, due to climatic stress conditions. Moreover, the rainfed vine with the shorter canopy structure could have a higher yield compared to the taller canopy.<br>A Região Demarcada do Douro, localizada no nordeste de Portugal, caracteriza-se pelo clima Mediterrânico, com um acentuado défice hídrico no período estival e temperatura elevada. Este aspecto pode reduzir a produtividade e a qualidade das vinhas. No âmbito desta dissertação de mestrado, este estudo propôs compreender as relações da vinha com as alterações climáticas na Região Demarcada do Douro, estabelecendo três níveis diferentes de irrigação por défice (25, 50 e 75 % ETc) e tratamento controle, não irrigado. Além da condição de estresse hídrico, diferentes alturas de parede de vegetação foram estabelecidas para avaliar sua influência nos parâmetros fisiológicos, químicos e produtivos. A avaliação da evapotranspiração (ETc), potencial hídrico de base, NDVI, CCI, troca de gases e área foliar ocorreu durante todo o período de maturação. Para avaliar a maturação tecnológica foram medidos o peso, diâmetro e características químicas dos frutos. Na colheita, o FTIR processou as características químicas do mosto. O peso de poda e o índice de Ravaz completaram as avaliações agronômicas. Os resultados desta pesquisa corroboram com estudos anteriores, indicando que as videiras de sequeiro podem ter um rendimento menor na colheita do que as irrigadas, devido às condições de estresse climático. Além disso, videiras de sequeiro com a parede de vegetação mais baixa podem ter um rendimento maior em comparação com a parede mais alta.