<i>Microvine</i>
            : A New Model to Study Grapevine Growth and Developmental Patterns and their Responses to Elevated Temperature

Luchaire, Nathalie; Rienth, Markus; Romieu, Charles; Nehe, Ajit; Chatbanyong, Ratthaphon; Houel, Cléa; Ageorges, Agnès; Gibon, Yves; Turc, Olivier; Muller, Bertrand; Torregrosa, Laurent; Pellegrino, Anne

doi:10.5344/ajev.2017.16066

Cited by 20 publications

(34 citation statements)

References 34 publications

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“…For this purpose, the positions of the phytomers along the axis were converted into cumulated thermal time after their emission by multiplying their plastochron index (or rank position from the apex) by the phyllochron. The temporal profiles of leaf area and berry volume (green growth phase) resulting from this spatiotemporal conversion are similar to the real temporal profiles obtained at a given level of phytomer [8,20,31]. This property makes it possible to reconstruct temporal dynamics of [27].…”

Section: Temporal Conversion Of Spatial Profilessupporting

confidence: 54%

The Microvine: A Versatile Plant Model to Boost Grapevine Studies in Physiology and Genetics

Pellegrino¹,

Romieu²,

Rienth³

et al. 2019

Advances in Grape and Wine Biotechnology

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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 kinetic data from spatial phenotypes. This biological model allows experiments on vine and grape development in tightly controlled conditions, which greatly accelerate physiology, molecular biology, as well as genetic studies. After introducing the main biological properties of the microvine, main results from various research programs performed with the microvine model will be presented.

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Section: Temporal Conversion Of Spatial Profilessupporting

confidence: 54%

The Microvine: A Versatile Plant Model to Boost Grapevine Studies in Physiology and Genetics

Pellegrino¹,

Romieu²,

Rienth³

et al. 2019

Advances in Grape and Wine Biotechnology

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“…Apart from accelerating the phenological development of grapevines, increasing temperatures will also affect grapevine growth and shoot architecture [4]. Developmental rates of leaf primordia, unfolded and fully expanded leaves are constant when expressed in thermal time as observed for naturally varying field and greenhouse conditions [5,6]. For example, appearance rates linearly relate to temperature.…”

Section: Introductionmentioning

confidence: 99%

“…However, even this stable program might be affected by the trophic state and the water status of the vine [7]. In addition, growth rates and durations of Grenache Noir are not stable when expressed in thermal time [5] and different grapevine cultivars might respond differently to changes in temperatures, as shown by Luchaire et al [6]. In the growth chamber experiment of Buttrose [8], which covered a wide range of constant temperatures from 15 • C to 30 • C, Riesling reached maximal shoot lengths at 30 • C, whereas the maximal node number was reached at lower temperatures (25 • C).…”

Section: Introductionmentioning

confidence: 99%

Modelling Approach for Predicting the Impact of Changing Temperature Conditions on Grapevine Canopy Architectures

et al. 2019

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Future climatic conditions might have severe effects on grapevine architecture, which will be highly relevant for vineyard management decisions on shoot positioning, pruning or cutting. This study was designed to help gaining insight into how, in particular, increasing temperatures might affect grapevine canopies. We developed a functional-structural model for Riesling, Virtual Riesling, based on digitised data of real plants and a comprehensive state-of-the-art data analysis. The model accounts for the variability in temperature-sensitive morphological processes, such as bud break and appearance rates. Our simulation study using historical weather data revealed significant effects of the thermal time course over the year on bud burst of the cane and on primary shoots. High variabilities in these events affect canopy growth and leaf area distribution. This report shows that Virtual Riesling can be useful in assessing the significance of changing temperatures for grapevine architecture and thereby considering management techniques such as vertical shoot positioning. Further developments of Virtual Riesling might support the knowledge gain for developing necessary adaptations in future vineyard management and, thus, facilitate future work on climate change research using functional-structural model approaches.

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“…Major issues for the wine industry include the need for new insights into relations between the genes and traits that help determine grapevine yield and quality, and how they are affected by climate change. To guarantee sustainable grapevine production in the future, a better understanding is required of grapevine responses to the predicted elevated temperatures and water deficit (Torregrosa et al, 2017;Ollat et al, 2018). However, the studies that are needed are difficult to conduct due to the extended period (two consecutive growing seasons) required for the development of reproductive organs along the proleptic shoots (Pratt, 1971;Carmona et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

“…Several experiments have been performed on microvines under fully controlled environmental conditions to quantify the effects of abiotic stress on shoot and berry development simultaneously (Rienth et al, 2014;Luchaire et al, 2017). The present study was performed to parameterize the microvine as a plant model to study the development of latent buds under controlled temperature conditions.…”

Section: Introductionmentioning

confidence: 99%

The microvine, a model to study the effect of temperature on grapevine latent bud development and fruitfulness

et al. 2019

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Aim: The success of inflorescence primordia initiation and differentiation within latent buds (i.e. bud fruitfulness) is a critical issue for grapevine yield sustainability under climate change. The aim of the present study was to track the timing and rate of inflorescence development in latent buds along the cane and to quantify their responses to elevated day/night (D/N) temperatures.Methods and Results: The experiments were conducted under controlled conditions, using the microvine model, which is suitable for establishment in small areas. Two imagery methods for analyzing bud anatomy were assessed: light microscopy and x-ray microtomography. Light microscopy was laborious, but it was the most accurate method for investigating organogenesis in the primordial shoot of the latent bud. In plants grown in a greenhouse (D/N, 25°C/15°C), the number of phytomer primordia in latent buds increased linearly from the apical to the basal buds on the cane. A maximum of six phytomers and two inflorescence primordia were observed beneath the 20th bud position that is, slightly fewer than usually reported with macrovines. The first and second inflorescences started to differentiate at the 14th and 18th bud position, respectively. Temperature increases in the growth chamber (D/N, 20–30°C/15–25°C) only slightly changed the final number of preformed phytomers and the probability of inflorescence primordia differentiation per bud. However, elevated temperature sharply accelerated and thereby shortened development of the latent bud primordial shoot, resulting in differentiation of the first inflorescence primordia straight from the fifth bud position. Based on the spatiotemporal conversion of bud position into thermal time, the first inflorescence started to differentiate 332 growing degree days (°Cd) (or 41 days) after bud emergence at D/N 20°C/15°C, and only 98°Cd (or 5 days) after bud emergence at D/N 35°C/25°C. Finally, the number of preformed phytomers was shown to correlate with primary bud length and cane diameter, independent of temperature. These easily measured variables may be used as indicators of bud developmental stage and potential bud fruitfulness in further studies using the microvine.Conclusions: The microvine appears to be suitable for parameterizing a developmental model of grapevine latent buds under controlled environmental conditions and when evaluating the response to elevated D/N temperatures.Significance and impact of the study: The precise description of the timing and rate of differentiation of phytomers and inflorescences opens new perspectives for understanding the molecular processes underlying the response of bud fruitfulness to environmental constraints.

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Microvine : A New Model to Study Grapevine Growth and Developmental Patterns and their Responses to Elevated Temperature

Cited by 20 publications

References 34 publications

The Microvine: A Versatile Plant Model to Boost Grapevine Studies in Physiology and Genetics

The Microvine: A Versatile Plant Model to Boost Grapevine Studies in Physiology and Genetics

Modelling Approach for Predicting the Impact of Changing Temperature Conditions on Grapevine Canopy Architectures

The microvine, a model to study the effect of temperature on grapevine latent bud development and fruitfulness

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