Markus Rienth

Changins - University of Sciences and Art Western Switzerland Changins College for Viticulture and Oenology

Background Priming plants with natural products is extensively studied in the agricultural field to reduce the use of synthetic and copper-based pesticides. Previous studies have shown that Oregano essential oil vapour (OEOV) is an effective priming agent against downy mildew (DM) in grapevine (Vitis vinifera L. cv. Chasselas), activating different...

The increasing interest in organic and biodynamic wine production is driven by a desire for sustainability and reduced reliance on synthetic inputs. As of 2021, organic viticulture accounted for 6.4 % of the global vineyard surface, with biodynamic practices gaining traction, particularly among high-end wineries seeking to differentiate their produ...

Plant biologists have long used various model organisms, such as Arabidopsis thaliana, to study biological processes. The emergence of algal model organisms in recent years greatly facilitated plant research due to their compact genomes with a very low level of functional redundancy and their physiological properties. Here, the green microalga Chlo...

Due to global warming, agricultural production systems are exposed to increasing abiotic stresses, which threaten an economically and environmentally sustainable food production. Innovative environmentally friendly solutions are needed to cope with climate-related risks and to reduce the use of high amounts of synthetic agrochemicals. A promising s...

Traditional methods for assessing vine water status, such as the Scholander pressure chamber, are time-consuming, punctual and labour-intensive. The development of alternative methods which are accurate, reliable and can provide real-time information on vine water status is a necessity for farmers all over the world. This study proposes the use of...

Ce deuxième article est complémentaire à celui du mois dernier qui présentait la partie on-station du projet CV-VigneSol. Il porte sur la partie on-farm de ce projet de recherche soutenu par l'OFAG de-puis 2021. Treize parcelles ont été mises en place dans le cadre de ce réseau a n d'acquérir des réfé-rences sur di érentes thématiques importantes c...

P r o d u c t i o n v é g é t a l e Résumé Une prospection effectuée en Valais (CH) dans une population massale de Syrah originaire des Côtes du Rhône septentrionales (F) et notamment du vignoble de la Côte rôtie, a permis de sélectionner quatorze candidats clones. Leurs performances agronomiques et oenolo-giques ont été comparées à celles de deux...

Defence priming of plants with natural products is extensively studied in the agricultural field to reduce the use of synthetic and copper-based pesticides. Previous studies have shown that Oregano essential oil vapour (OEOV) is an effective priming agent against downy mildew (DM) in grapevine ( Vitis vinifera L. cv. Chasselas), activating differen...

Introduction Global warming is a major threat to yield sustainability in most crops, including grapevine. Whether or not grapevine fruitfulness is impaired by an imbalance between carbon supply and demand caused by high temperatures was investigated in the present study. Methods Five experiments were conducted on Microvine , a natural mutant of gr...

Downy mildew (DM; Plasmopara viticola) is amongst the most severe fungal diseases in viticulture and the reason for the majority of fungicide applications. To reduce synthetic and copper-based fungicides, there is an urgent need for natural alternatives, which are being increasingly tested by the industry and the research community. However, their...

UNION GIRONDINE DES VINS DE BORDEAUX-JUILLET-AOÛT 2023 C ette brève revue vise à fournir une perspective actualisée des résultats de la littérature comparant les différentes méthodes basées sur la plante. Les avancées scientifiques concernant la régulation hydrique de la vigne sont dé-crites et appliquées afin de discuter des forces et des limites...

Assessing vine water status is crucial to optimising cultural practices, including irrigation strategies, to guarantee environmentally and economically sustainable viticulture in a context of increasing water shortages and global warming. Vine water status can be assessed indirectly, via soil-based or atmospheric-based methods, or directly via plan...

In the pursuit of increasing sustainability, climate change resiliency and independence of synthetic pesticides in agriculture, the interest of consumers and producers in organic and biodynamic farming has been steadily increasing in recent decennia. This is, in particular, the case for the vitivinicultural industry in Europe, where more and more p...

In recent years, agricultural crops experience unusually early onset of vegetation due to global warming, which can cause major frost damage with devastating effects on crop yields. To mitigate the risk of frost damage, an integrated solution was developed, consisting of an aqueous-based biocompatible foam and a portable foam applicator enabling wi...

Herbicide-free soil management practices are needed to mitigate climate change, increase biodiversity and improve soil quality while minimizing detrimental effects on grapevine's stress tolerance and fruit quality. Within a multidisciplinary 4-year project we aim to a) evaluate the impact of cover crops on environmental and agronomic parameters and...

Grapevine leafroll disease (GLD) is one of the most economically damaging virus diseases in grapevine, with grapevine leafroll-associated virus 1 (GLRaV-1) and grapevine leafroll-associated virus 3 (GLRaV-3) as the main contributors. This study complements a previously published transcriptomic analysis and compared the impact of two different forms...

The grapevine is subject to high number of fungal and viral diseases, which are responsible for important economic losses in the global wine sector every year. These pathogens deteriorate grapevine berry quality either directly via the modulation of fruit metabolic pathways and the production of endogenous compounds associated with bad taste and/or...

In grapevines, as in other plants, sucrose and its constituents glucose and fructose are fundamentally important and carry out a multitude of roles. The aims of this review are threefold. First, to provide a summary of the metabolism and transport of sucrose in grapevines, together with new insights and interpretations. Second, to stress the import...

Temperature, water, solar radiation, and atmospheric CO2 concentration are the main abiotic factors that are changing in the course of global warming. These abiotic factors govern the synthesis and degradation of primary (sugars, amino acids, organic acids, etc.) and secondary (phenolic and volatile flavor compounds and their precursors) metabolite...

Tartaric acid (TA) is an obscure end point to the catabolism of ascorbic acid (Asc). Here, it is proposed as a “specialized primary metabolite”, originating from carbohydrate metabolism but with restricted distribution within the plant kingdom and lack of known function in primary metabolic pathways. Grapes fall into the list of high TA-accumulator...

Assessing the water status of the vine is crucial for optimizing cultivation practices and irrigation strategies while ensuring environmentally and economically sustainable viticulture. In view of the most recent results in the literature, this article critically reviews the main measurement methods carried out directly on plants.

Understanding how different pedoclimatic conditions interact with vine and berry physiology, and subsequently impact wine quality, is paramount for an good valorization of viticultural terroirs and can help to optimize mitigation strategies in the face of global warming. The aim of the present study was to establish terroir zones in a steep slope r...

Botrytis cinerea infections of Vitis spp. fruits cause major economic losses, and grape producers rely on synthetic and copper-based fungicides for control of this pathogen. These pesticides present risks for human health and the environment. Implementation of low-impact disease management solutions is important for improving sustainability of viti...

Leafroll viruses are among the most devastating pathogens in viticulture and are responsible for major economic losses in the wine industry. However, the molecular interactions underlying the effects on fruit quality deterioration are not well understood. The few molecular studies conducted on berries from infected vines, associated quality decreas...

Background Grapevine leafroll associated viruses (GLRaV), the causing agents of grapevine leafroll disease (GLD) are amongst the most devastating graft and vector transmitted pathogens in viticulture and responsible for important economic losses in the wine industry. Reported fruit alterations caused by GLD consist in a delay of ripening, a reducti...

L'évaluation de l'état hydrique de la vigne est cruciale pour optimiser les pratiques culturales et les stratégies d'irrigation afin de garantir une viticulture durable sur le plan environnemental et économique, compte tenu des pénuries d'eau croissantes causées par le réchauffement climatique. L'état hydrique de la vigne peut être évalué par des m...

Le dérèglement climatique observé au cours des dix dernières années, caractérisé par une alternance d’années normales, généralement considérées comme plus froides, et d’années chaudes et par une augmentation régulière des températures moyennes, impacte fortement les cinétiques de développement et de maturation des baies de raisin. La composition ch...

Rising global air temperatures will lead to an increased evapotranspiration and altered precipitation pattern. In many regions this may result in a negative water balance during the vegetative cycle, which can augment the risk of drought and will require mitigation strategies. These strategies, ultimately, will mean the installation of irrigation s...

The reduction of synthetic fungicides in agriculture is necessary to guarantee a sustainable production that protects the environment and consumers’ health. Downy mildew caused by the oomycete Plasmopara viticola is the major pathogen in viticulture worldwide and responsible for up to 60% of pesticide treatments. Alternatives to reduce fungicides a...

The increasing risk of water deficit stress due to global warming subjects winegrowers of traditional rain fed viticulture regions to new challenges regarding vine water status assessment and possible drought mitigation strategies, such as irrigation. This review summarizes the most recent studies on the impact of water deficit stress on vine and b...

Synthetic pesticides applied in viticulture represent a relatively high amount compared to other agricultural crops, which is due to the high sensitivity of grapevine (Vitis vinifera L.) to fungal. To promote sustainable vineyard-ecosystems and meet consumer acceptance alternatives to reduce fungicides are utterly needed. Amongst most potent natura...

Context and challenges: Like most other perennial crops, the grapevine needs to undergo a juvenile period before fruiting. Thus, the development of reproductive organs from seedlings is possible only after the second or third vegetative cycle. Each proleptic axis then displays only one to three inflorescences per growing cycle. These biological fea...

Grapevine leafroll associated virus (GLRaV) infections deteriorate vine physiological performance and cause high losses of yield and fruit quality and are thus causing serious economic losses in the wine industry. Physiological and molecular studies on the impact of leafroll infections on plant and fruit metabolism are relatively scare and the mole...

The microvine is a grapevine somatic variant. The Vvgai1 mutation results in a miniaturization of the vegetative organs of the plant keeping fruit size intact and a systematic conversion of tendrils into inflorescences. The physiological characterization of the vegetative and reproductive development of the microvine makes it possible to infer kine...

The reduction of synthetic fungicides in agriculture a major challenge in maintaining sustainable production, protecting the environment and consumers’ health. Downy mildew caused by the oomycete Plasmopora viticola is the major pathogen in viticulture worldwide and responsible for up to 60% of pesticide treatments. Alternatives to reduce fungicide...

The aim of this ongoing study is to establish a vine physiology, berry quality - based methodology to analyze small scale differences between plots in a sub-region of the AOC Lavaux, in Switzerland. The production area Villette is almost to 100% planted with the cultivar Chasselas L. covering a total of 140 ha of steep slope terraced vineyards and...

Background and Aims Grape berries are dried to concentrate sugar and aroma compounds to produce specific wine styles. This work aimed to characterise biochemical changes during drying of two different cultivars, considering in particular tartaric acid and malic acid evolution. Methods and Results Shiraz and Merlot grapes were dried at nine, 15, 21...

The aim of this ongoing study is to establish a vine physiology, berry quality - based methodology to analyze small scale differences between plots in a sub-region of the AOC Lavaux, in Switzerland. The production area Villette is almost to 100% planted with the cultivar Chasselas L. covering a total of 140 ha of steep slope terraced vineyards and...

Global warming advances ripening of grapes to warmer months of the growing season, impacting fruit physiology and threatening wine typicity. Late pruning, early leaf removal or anti-transpirant application have been shown to be able to delay vine phenology and ripening depending on genotype and growing region. New disease resistant varieties repres...

In contrast to malic acid, few studies relate to the metabolism of tartaric acid (TA) under abiotic stress in ripening berries. TA biosynthesis is well known with its metabolism believed to be limited from berry set until véraison and therefore not impacted by ripening conditions. However in previous (unpublished) berry drying experiments, as well...

Grape berry drying experiment with special focus on the termperature effect on primary metabolites in particular organic acids.

p class="Abstract" style="text-align: justify;"> Aim: In the long term, genetic improvement is one of the major strategies to support sustainable wine production in a changing climate. Over the past 5 years, we have developed an interdisciplinary research program that aimed to: i) characterize the impact of temperature increase sensed by the entire...

Aim: In the long term, genetic improvement is one of the major strategies to support sustainable wine production in a changing climate. Over the past 5 years, we have developed an interdisciplinary research program that aimed to: i) characterize the impact of temperature increase sensed by the entire plant or individual bunches on the development a...

UMR AGAP - Equipe Diversité, adaptation et amélioration de la vigne (DAAV)Conference: 9. International Symposium on Grapevine Physiology and BiotechnologyLocation: La Serena, ChiliDate: APR 21, 2013

Growing standardized plant material in controlled environment can facilitate the disentangling of the many impacts of climate change on grapevine production and quality. Microvine is a natural gibberellic acid insensitive mutant showing dwarfism, early and continuous flowering along the vegetative axes. It was initially proposed as a model for gene...

As a perennial plant, grapevine needs a long juvenile period before fruiting. In standard conditions, cuttings from an adult plant allow the production of fruits from the second year. Also, common cultivars only produce reproductive organs once per growing cycle and per proleptic axis. These biological features and the size of the adult vine are ma...

Background Fruit composition at harvest is strongly dependent on the temperature during the grapevine developmental cycle. This raises serious concerns regarding the sustainability of viticulture and the socio-economic repercussions of global warming for many regions where the most heat-tolerant varieties are already cultivated. Despite recent prog...

The performance of the vine, including productivity and wine quality is highly dependent on climate. In the long term, genetic improvement is the only strategy that will support sustainable wine production systems facing the announced climate changes. Unfortunately, the lack of knowledge about the mechanisms of adaptation of the grapevine to T° and...

La vigne est une plante pérenne à cycle reproducteur annuel. Ce fait signifie qu'en climat tempéré, chaque stade de développement de la baie ne peut être obser-vé qu'une fois par an. Comme d'autres plantes pé-rennes, un autre inconvénient de la vigne est qu'après germination, greffage ou bouturage, elle passe par une phase juvénile d'environ trois...

The increasing temperature associated with climate change impacts grapevine phenology and development with critical effects on grape yield and composition. Plant breeding has the potential to deliver new cultivars with stable yield and quality under warmer climate conditions, but this requires the identification of stable genetic determinants. This...

Grapevine yield sustainability under global warming is a major issue. A hypothesis is that long-term elevated temperatures may cause the failure of key phases of reproductive development, through their negative impact on carbon balance. However, testing the specific role of plant carbon status on yield elaboration under elevated temperatures is dif...