ORCID Profile
0000-0002-9841-3609
Current Organisation
Charles Sturt University - Orange Campus
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Publisher: Wiley
Date: 21-09-2017
DOI: 10.1111/PPL.12604
Abstract: Grapevine (Vitis vinifera) roots and leaves represent major carbohydrate and nitrogen (N) sources, either as recent assimilates, or mobilized from labile or storage pools. This study examined the response of root and leaf primary metabolism following defoliation treatments applied to fruiting vines during ripening. The objective was to link alterations in root and leaf metabolism to carbohydrate and N source functioning under conditions of increased fruit sink demand. Potted grapevine leaf area was adjusted near the start of véraison to 25 primary leaves per vine compared to 100 leaves for the control. An additional group of vines were completely defoliated. Fruit sugar and N content development was assessed, and root and leaf starch and N concentrations determined. An untargeted GC/MS approach was undertaken to evaluate root and leaf primary metabolite concentrations. Partial and full defoliation increased root carbohydrate source contribution towards berry sugar accumulation, evident through starch remobilization. Furthermore, root myo-inositol metabolism played a distinct role during carbohydrate remobilization. Full defoliation induced shikimate pathway derived aromatic amino acid accumulation in roots, while arginine accumulated after full and partial defoliation. Likewise, various leaf amino acids accumulated after partial defoliation. These results suggest elevated root and leaf amino N source activity when leaf N availability is restricted during fruit ripening. Overall, this study provides novel information regarding the impact of leaf source restriction, on metabolic compositions of major carbohydrate and N sources during berry maturation. These results enhance the understanding of source organ carbon and N metabolism during fruit maturation.
Publisher: CSIRO Publishing
Date: 2011
DOI: 10.1071/FP10240
Abstract: In cultivated grapevines (Vitis vinifera L.), suboptimal photoassimilatory conditions during flowering can lead to inflorescence necrosis and shedding of flowers and young ovaries and, consequently, poor fruit set. However, before this study it was not known whether carbohydrate reserves augment fruit set when concurrent photoassimilation is limited. Carbohydrate reserves are most abundant in grapevine roots and soil temperature moderates their mobilisation. Accordingly, we grew potted Chardonnay grapevines in soil at 15°C (cool) or 26°C (warm) from bud break to the onset of flowering to manipulate root carbohydrate reserve status. Then to induce photoassimilatory responses we subjected the plants to low (94 µmol mol–1) CO2 or ambient (336 µmol mol–1) CO2 atmospheres during fruit setting. Analyses of photoassimilation and biomass and carbohydrate reserve distribution confirmed that fruit set was limited by concurrent photoassimilation. Furthermore, the availability of current photoassimilates for inflorescence development and fruit set was conditioned by the simultaneous demands for shoot and root growth, as well as the restoration of root carbohydrate reserves. Results indicate that great seasonal variability in grapevine fruit set is a likely response of cultivated grapevines to photoassimilatory stresses, such as shading, defoliation and air temperature and to variations in carbohydrate reserve status before flowering.
Publisher: Oxford University Press (OUP)
Date: 07-07-2006
DOI: 10.1093/JXB/ERL020
Abstract: Berry diameter was monitored during dry-down and rewatering cycles and pressurization of the root system of Vitis vinifera (cv. Merlot) and Vitis labruscana (cv. Concord) to test changes in xylem functionality during grape ripening. Prior to veraison (onset of ripening), berries maintained their size under declining soil moisture until the plants had used 80% of the transpirable soil water, began to shrink thereafter, and recovered rapidly after rewatering. By contrast, berry diameter declined slowly but steadily during post-veraison water stress and did not recover after rewatering irrigation merely prevented further shrinking. Preconditioning vines with a period of water stress after flowering did not influence the berries' reaction to subsequent changes in transpirable soil water. Pressurizing the root system led to concomitant changes in berry diameter only prior to veraison, although some post-veraison Concord, but not Merlot, berries cracked under root pressurization. The xylem-mobile dye basic fuchsin, infused via the shoot base, moved throughout the berry vasculature before veraison, but became gradually confined to the brush area during ripening. When the dye was infused through the stylar end of attached berries, it readily moved back to the plant both before and after veraison. Our work demonstrated that berry-xylem conduits retain their capacity for water and solute transport during ripening. It is proposed here that apoplastic phloem unloading coupled with solute accumulation in the berry apoplast may be responsible for the decline in xylem water influx into ripening grape berries. Instead, the xylem may serve to recycle excess phloem water back to the shoot.
Publisher: Elsevier BV
Date: 06-2012
DOI: 10.1016/J.ACA.2011.10.055
Abstract: Predictions of grapevine yield and the management of sugar accumulation and secondary metabolite production during berry ripening may be improved by monitoring nitrogen and starch reserves in the perennial parts of the vine. The standard method for determining nitrogen concentration in plant tissue is by combustion analysis, while enzymatic hydrolysis followed by glucose quantification is commonly used for starch. Attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FT-IR) combined with chemometric modelling offers a rapid means for the determination of a range of analytes in powdered or ground s les. ATR-FT-IR offers significant advantages over combustion or enzymatic analysis of s les due to the simplicity of instrument operation, reproducibility and speed of data collection. In the present investigation, 1880 root and wood s les were collected from Shiraz, Semillon and Riesling vineyards in Australia and Germany. Nitrogen and starch concentrations were determined using standard analytical methods, and ATR-FT-IR spectra collected for each s le using a Bruker Alpha instrument. S les were randomly assigned to either calibration or test data sets representing two thirds and one third of the s les respectively. Signal preprocessing included extended multiplicative scatter correction for water and carbon dioxide vapour, standard normal variate scaling with second derivative and variable selection prior to regression. Excellent predictive models for percent dry weight (DW) of nitrogen (range: 0.10-2.65% DW, median: 0.45% DW) and starch (range: 0.25-42.82% DW, median: 7.77% DW) using partial least squares (PLS) or support vector machine (SVM) analysis for linear and nonlinear regression respectively, were constructed and cross validated with low root mean square errors of prediction (RMSEP). Calibrations employing SVM-regression provided the optimum predictive models for nitrogen (R(2)=0.98 and RMSEP=0.07% DW) compared to PLS regression (R(2)=0.97 and RMSEP=0.08% DW). The best predictive models for starch was obtained using PLS regression (R(2)=0.95 and RSMEP=1.43% DW) compared to SVR (R(2)=0.95 RMSEP=1.56% DW). The RMSEP for both nitrogen and starch is below the reported seasonal flux for these analytes in Vitis vinifera. Nitrogen and starch concentrations in grapevine tissues can thus be accurately determined using ATR-FT-IR, providing a rapid method for monitoring vine reserve status under commercial grape production.
Publisher: International Society for Horticultural Science (ISHS)
Date: 03-2016
Publisher: International Society for Horticultural Science (ISHS)
Date: 03-2016
Publisher: Springer Netherlands
Date: 2014
Publisher: Wiley
Date: 22-03-2010
Publisher: Elsevier BV
Date: 03-2018
DOI: 10.1016/J.JPLPH.2018.01.006
Abstract: Some plant species demonstrate a pronounced 24 h rhythm in fine root growth but the endogenous and exogenous factors that regulate these diel cycles are unclear. Photoperiod and temperature are known to interact with diel patterns in shoot growth but it is uncertain how these environmental factors are interrelated with below-ground growth. In this particular study, the fine root system of two grapevine species was monitored over a period of ten days with a high resolution scanner, under constant soil moisture and three different photoperiod regimes. Pronounced diel rhythms in shoot and root growth rates were apparent under a fixed 14 h photoperiod. Maximal root growth rate occurred 1-2 h prior to- and until 2 h after the onset of darkness. Subsequently, during the latter part of the dark period, root growth rate decreased and reached minimal values at the onset of the light period. Relative to 22 °C, exposure to a 30 °C air and soil temperature halved root growth but stimulated shoot growth. Notably, the shoot extension rate peak shifted from late afternoon to midnight at this higher temperature zone. When plants were exposed to a delayed photoperiod or progressively shortening photoperiod, the diel changes in root growth rate followed the same pattern as in the fixed photoperiod, regardless of whether the plant was in light or dark. This suggests that light was not the predominant trigger for stimulating root elongation. Conversely, shoot growth rates were not fixed to a clock, with minimum growth consistently at the completion of the dark period regardless of the time of day. In summary, fine root growth of grapevines was found to have a pronounced diel pattern and an endogenous circadian clock appears to orchestrate this rhythm. Soil temperature modified the litude of this pattern, but we argue here that, as evidenced from exhausted starch reserves within root tips by early morning, carbon supply from photosynthesis is also required to maintain maximum root growth.
Publisher: International Society for Horticultural Science (ISHS)
Date: 06-2018
Publisher: Hindawi Limited
Date: 04-2001
Publisher: Hindawi Limited
Date: 10-2003
Publisher: Elsevier BV
Date: 05-2019
Publisher: International Society for Horticultural Science (ISHS)
Date: 03-2020
Publisher: American Society for Horticultural Science
Date: 03-2017
Abstract: Grapevine ( Vitis vinifera ) berries are sugar and nitrogen (N) sinks between veraison and fruit maturity. Limited photoassimilation, often caused by water constraints, induces reserve total nonstructural carbohydrate (TNC) remobilization, contributing to berry sugar accumulation, while fruit N accumulation can be affected by vine water supply. Although postveraison root carbohydrate remobilization toward the fruit has been identified through 14 C tracing studies, it is still unclear when this remobilization occurs during the two phases of berry sugar accumulation (rapid and slow). Similarly, although postveraison N reserve mobilization toward the fruit has been reported, the impact of water constraints during berry N accumulation on its translocation from the different grapevine organs requires clarification. Potted grapevines were grown with or without fruit from the onset of veraison. Vines were irrigated to sustain water constraints, and fortnightly root, trunk, shoot, and leaf structural biomass, starch, soluble sugar, total N, and amino N concentrations were determined. The fruit sugar and N accumulation was also assessed. Root starch depletion coincided with root sucrose and hexose accumulation during peak berry sugar accumulation. Defruiting at veraison resulted in continuous root growth, earlier starch storage, and root hexose accumulation. Leaf N depletion coincided with fruit N accumulation, while the roots of defruited vines accumulated N reserves. Root growth, starch, and N reserve accumulation were affected by maturing fruit during water constraints. Root starch is an alternative source to support fruit sugar accumulation, resulting in reserve starch depletion during rapid fruit sugar accumulation, while root starch refills during slow berry sugar accumulation. On the other hand, leaf N is a source toward postveraison fruit N accumulation, and the fruit N accumulation prevents root N storage.
Publisher: MDPI AG
Date: 27-11-2019
DOI: 10.3390/MOLECULES24234341
Abstract: Climate models predict an increase in the frequency and duration of heatwaves with an increase in intensity already strongly evident worldwide. The aim of this work was to evaluate the effect of two heatwave-related parameters (intensity and duration) during berry ripening and identify a threshold for berry survival and flavonoid accumulation. A Doehlert experimental design was used to test three temperature intensities (maxima of 35, 46, and 54 °C) and five durations (3 to 39 h), with treatments applied at the bunch level shortly after véraison. Berry skin and seeds were analysed by liquid chromatography-triple quadrupole-mass spectrometry (LC-QqQ-MS) for flavonoids (flavonols, anthocyanins, free flavan-3-ols, and tannins). Berries exposed to 46 °C showed little difference compared to 35 °C. However, berries reaching temperatures around 54 °C were completely desiccated, and all flavonoids were significantly decreased except for skin flavonols on a per berry basis and seed tannins in most cases. Some compounds, such as dihydroxylated flavonoids and galloylated flavan-3-ols (free and polymerised), were in higher proportion in damaged berries suggesting they were less degraded or more synthesised upon heating. Overall, irreversible berry damages and substantial compositional changes were observed and the berry survival threshold was estimated at around 50–53 °C for mid-ripe Shiraz berries, regardless of the duration of exposure.
Publisher: Springer Science and Business Media LLC
Date: 12-2019
DOI: 10.1186/S12870-019-2152-9
Abstract: Elucidating the effect of source-sink relations on berry composition is of interest for wine grape production as it represents a mechanistic link between yield, photosynthetic capacity and wine quality. However, the specific effects of carbohydrate supply on berry composition are difficult to study in isolation as leaf area or crop adjustments can also change fruit exposure, or lead to compensatory growth or photosynthetic responses. A new experimental system was therefore devised to slow berry sugar accumulation without changing canopy structure or yield. This consisted of six transparent 1.2 m 3 chambers to enclose large pot-grown grapevines, and large soda-lime filled scrubbers that reduced carbon dioxide (CO 2 ) concentration of day-time supply air by approximately 200 ppm below ambient. In the first full scale test of the system, the chambers were installed on mature Shiraz grapevines for 14 days from the onset of berry sugar accumulation. Three chambers were run at sub-ambient CO 2 for 10 days before returning to ambient. Canopy gas exchange, and juice hexose concentrations were determined. Net CO 2 exchange was reduced from 65.2 to 30 g vine − 1 day − 1 , or 54%, by the sub-ambient treatment. At the end of the 10 day period, total sugar concentration was reduced from 95 to 77 g L − 1 from an average starting value of 23 g L − 1 , representing a 25% reduction. Scaling to a per vine basis, it was estimated that 223 g of berry sugars accumulated under ambient supply compared to 166 g under sub-ambient, an amount equivalent to 50 and 72% of total C assimilated. Through supply of sub-ambient CO 2 using whole canopy gas exchange chambers system, an effective method was developed for reducing photosynthesis and slowing the rate of berry sugar accumulation without modifying yield or leaf area. While in this case developed for further investigations of grape and wine composition, the system has broader applications for the manipulation and of study of grapevine source-sink relations.
Publisher: Springer Science and Business Media LLC
Date: 30-08-2016
Publisher: American Society for Enology and Viticulture
Date: 11-10-2019
Publisher: Oxford University Press (OUP)
Date: 02-11-2018
DOI: 10.1093/JXB/ERY392
Abstract: Climate change scenarios predict an increase in average temperatures and in the frequency, intensity, and length of extreme temperature events in many wine regions around the world. In already warm and hot regions, such changes may compromise grape growing and the production of high quality wine as high temperature has been found to affect berry composition critically. Most recent studies focusing on the sole effect of temperature, separated from light and water, on grape berry composition found that high temperature affects a wide range of metabolites, and in particular flavonoids-key compounds for berry and wine quality. A decrease in total anthocyanins is reported in most cases, and appears to be directly associated with high temperature. Changes in anthocyanin composition, and flavonol and proanthocyanidin responses are however less consistent, and reflect the complexity of the underlying biosynthetic pathways and ersity of experimental treatments that have been used in these studies. This review examines the impact of high temperature on the biosynthesis, accumulation, and degradation of flavonoids, and attempts to reconcile the ersity of responses in relation to the latest understanding of flavonoid chemistry and molecular regulation.
Publisher: Universite de Bordeaux
Date: 10-05-2019
DOI: 10.20870/OENO-ONE.2019.53.2.2392
Abstract: Aim: The aim of the study was to test the effect of a single heat event (HE), and the additive effects of repeated HEs at whole-vine level, on Shiraz berry composition, including detailed tannins.Methods and results: In a UV-transparent glasshouse, a system was developed to in idually heat the above-ground parts of well-irrigated potted Shiraz vines without changing fruit and canopy light exposure. At the end of fruit set, and again prior to véraison, selected vines were heated to + 6 °C above ambient temperature for three consecutive days and nights in a combination of treatments to test the effect of a single HE and the additive effects of repeated HEs. A factorial design was used with four treatments (n=6): Control (C), heated at E-L 31 (HW1), heated at E-L 32 (HW2) and heated twice (HW1& ). Berries were s led from fruit set until maturity at regular intervals, and primary and secondary metabolites, including detailed tannin composition, were analysed by GC-MS and LC-MS/MS, respectively. Temperatures (mean and maximum) inside the glasshouse were influenced by outside weather conditions and the 1st HE (HE1) was more intense than the 2nd (HE2). Photosynthesis was significantly decreased for the heated vines during HE1 where maximum temperature reached 45 °C, affecting both berry weight and titratable acidity (TA). HE2 was less intense with maximum temperature only reaching 40 °C, and had no effect on photosynthesis and less direct impact on composition. A few primary metabolites were affected by either HE1 or HE2 such as valine, leucine, pyruvic and lactic acids. Interactions between the two HEs were found for TA, malic acid and glucose at harvest. Skin tannin composition was significantly impacted by HE1, applied during the main biosynthesis period, but not by HE2. Epicatechin gallate terminal subunit concentration was the most impacted by heat. Seed physiology was also affected by HE1 and HE2 as well as seed tannin composition right after HE1. A small decrease in both total anthocyanins and total soluble solids at the end of véraison suggested that ripening was slightly delayed for HW1& .Conclusions: Shiraz grapevines showed an elastic response to short heat stress between fruit set and véraison, with most impacts on physiology and composition observed during early post-treatment no longer evident by harvest.Significance and impact of the study: Increasing climate variability, with more frequent heatwaves, is a threat for viticulture in Australia where a large proportion of vineyards are located in already warm and hot regions. As grapevines may be exposed to abnormal high temperatures prior to véraison, knowledge on the effect of heat on metabolite biosynthesis occurring during this phase, such as tannins, is needed.
Publisher: Julius Kühn Institute, Federal Research Centre for Cultivated Plants, Institute for Grapevine Breeding Geilweilerhof Siebeldingen, Germany
Date: 2015
Publisher: MDPI AG
Date: 23-04-2016
DOI: 10.3390/S16040585
Publisher: International Society for Horticultural Science (ISHS)
Date: 2022
Publisher: Wiley
Date: 06-10-2011
Publisher: Elsevier BV
Date: 12-2019
Publisher: International Society for Horticultural Science (ISHS)
Date: 07-2016
Publisher: Hindawi Limited
Date: 23-03-2011
Publisher: Wiley
Date: 06-2005
Abstract: This study reports an optimized headspace‐solid phase microextraction (HS‐SPME) method for the determination of methoxypyrazines in wine. Analysis was performed by using comprehensive two‐dimensional gas chromatography with novel detection capabilities, including nitrogen phosphorus detection (GC×GC‐NPD) and time‐of‐flight mass spectrometry (GC×GC‐TOFMS). In the latter, stable isotope dilution was performed for the quantitation of 2‐methoxy‐3‐(2‐methylpropyl) pyrazine (IBMP), using labelled 2‐( 2 H 3 )methoxy‐3‐(2‐methylpropyl)pyrazine ( d 3 ‐IBMP) as the internal standard, and resolution of the two analogues was facilitated using the deconvolution capabilities of the TOFMS. This research represents the first report of HS‐SPME with isotope dilution and GC×GC‐TOFMS (GC×GC‐IDTOFMS). Analysis by GC×GC‐NPD enabled detection limits of 0.5 ng/L for the quantitation of IBMP, which was superior to that obtained using GC×GC‐IDTOFMS (1.95 ng/L). Nevertheless, both methods were adequately sensitive for real wine analysis, yielding highly comparable IBMP concentrations of 26.1 and 27.8 ng/L, respectively, from a Sauvignon blanc wine. The complexity of the real wine headspace was simplified as a result of selective detection using GC×GC‐NPD and, in the case of GC×GC‐IDTOFMS, the use of extracted ion chromatograms (EICs).
Publisher: Wiley
Date: 30-04-2018
DOI: 10.1111/PPL.12715
Abstract: Leaves are an important contributor toward berry sugar and nitrogen (N) accumulation, and leaf area, therefore, affects fruit composition during grapevine (Vitis vinifera) berry ripening. The aim of this study was to investigate the impact of leaf presence on key berry quality attributes in conjunction with the accumulation of primary berry metabolites. Shortly after the start of véraison (berry ripening), potted grapevines were defoliated (total defoliation and 25% of the control), and the accumulation of berry soluble solids, N and anthocyanins were compared to that of a full leaf area control. An untargeted approach was undertaken to measure the content in primary metabolites by gas chromatography/mass spectrometry. Partial and full defoliation resulted in reduced berry sugar and anthocyanin accumulation, while total berry N content was unaffected. The juice yeast assimilable N (YAN), however, increased upon partial and full defoliation. Remobilized carbohydrate reserves allowed accumulation of the major berry sugars during the absence of leaf photoassimilation. Berry anthocyanin biosynthesis was strongly inhibited by defoliation, which could relate to the carbon (C) source limitation and/or increased bunch exposure. Arginine accumulation, likely resulting from reserve translocation, contributed to increased YAN upon defoliation. Furthermore, assessing the implications on various products of the shikimate pathway suggests the C flux through this pathway to be largely affected by leaf source limitation during fruit maturation. This study provides a novel investigation of impacts of leaf C and N source presence during berry maturation, on the development of key berry quality parameters as underlined by alterations in primary metabolism.
Publisher: Elsevier BV
Date: 02-2017
Publisher: Universite de Bordeaux
Date: 29-05-2019
DOI: 10.20870/OENO-ONE.2019.53.2.2425
Abstract: Aim: The nutrient reserves in the grapevine perennial structure perform a critical role in supplying the grapevine with nutrients when demand cannot be sustained by root uptake. The seasonal changes in these reserves largely depend on the developmental stage and the associated growth requirements. These stored reserves are, in turn, influenced by environmental conditions and vineyard management practices, such as production levels and water availability. The aim of this study was to assess the nutrient dynamics of a major wine grape variety grown in Australia to determine the key nutrient uptake periods and to understand the mobilization patterns throughout a season.Methods and results: The own-rooted 10-year-old Shiraz vines used for the trial were located in the Riverina, which is a hot inland grape-growing region in New South Wales, Australia. Uniformly sized vines, identified by trunk circumference, were selected for 11 excavation dates with four replicates, from a month before bud-burst to leaf-fall. The above-ground section of the vines were separated into the different perennial, vegetative and reproductive organs. The below-ground section of the vines were obtained in an allocated area (6 m2/vine) and were excavated to a depth of 1 m, and the roots were separated into rootstock and three root sizes. Sub-s les of each tissue were freeze-dried and the remaining tissues were oven-dried at 70°C, and for both procedures the dry weight (DW) was recorded. For the nutrient analysis, the tissue sub-s les were ground up, and nutrients were determined with an nitrogen analyzer and an ICP-OES.The annual organs showed the highest nitrogen (N) concentrations in spring, with the leaves having 3% and inflorescences 2.5%, but stem N concentration was highest at the end of the season with 0.7% DW. Root N concentrations are at least double the other perennial sections, with these reserves declining early in the season and being replenished by leaf-fall. The changes in concentrations for perennial sections are similar for the other macro nutrients, but differ for Ca and S in the annual tissues. The N content of the perennial structure declined considerably until flowering, with a sharp increase after harvest. The majority of the N uptake occurred four weeks before flowering and four weeks before veraison, and more than half the N of the vine was allocated to the annual organs at harvest. Other macro nutrients show a pattern of decline and replenishment in the roots and wood and most nutrients were taken up predominantly four weeks prior to flowering.Conclusions: An important finding from the study revealed that the amount of each nutrient allocated to the perennial structure and annual parts varied between the nutrients. This understanding of the nutrient dynamics will lead to an optimization of in idual nutrient status and supply for grapevines.Significance and impact of the study: This is the first time that whole-vine nutrient levels were followed through the season under Australian conditions and on a wine grape variety for all macro nutrients. Such information is critical to allow precise prediction and modeling of grapevine nutrient requirements.
Publisher: International Society for Horticultural Science (ISHS)
Date: 10-2018
Publisher: American Society for Enology and Viticulture
Date: 20-03-2012
Publisher: International Society for Horticultural Science (ISHS)
Date: 12-2018
Publisher: CSIRO Publishing
Date: 2014
DOI: 10.1071/BT14071
Abstract: Root-zone warming of trees can result in an increase in biomass production but the mechanisms for this increase may differ between evergreen and deciduous species. The leaf gas exchange, carbohydrate and nitrogen (N) partitioning of two Australian evergreens, Acacia saligna and Eucalyptus cladocalyx, were compared to the deciduous Populus deltoides and Acer negundo after exposure to cool or warm soil during spring. The warm treatment stimulated aboveground biomass production in all four species however, the form of this increase was species dependent. Compared with the evergreens, soluble sugars were mobilised from the above- and belowground components to a greater extent in the deciduous species, especially during root-zone warming. Photosynthesis, stomatal conductance and transpiration were increased in the warm soil treatment for the two evergreens and P. deltoides only. In P. deltoides and A. saligna the new fine roots contained greater starch concentrations when grown in warm soil but only in A. negundo was new root growth greater. Compared with the other three species, the leguminous A. saligna contained the highest N and most of this was concentrated in the phyllodes of warmed plants with no apparent mobilisation from the existing biomass. In the other evergreen, E. cladocalyx, the existing leaves and stems were a N source for new growth, while in the two deciduous species N was derived from the woody components and structural roots. These data show that the carbohydrate movement and N partitioning patterns in response to soil warming differ between perennial and deciduous plants and are likely responsible for the different forms of biomass accumulation in each of these species.
Publisher: Hindawi Limited
Date: 10-04-2014
DOI: 10.1111/AJGW.12072
Publisher: Elsevier BV
Date: 11-2018
Publisher: Frontiers Media SA
Date: 14-03-2023
DOI: 10.3389/FPLS.2023.1162506
Abstract: To sustainably adapt viticultural production to drought, the planting of rootstock genotypes adapted to a changing climate is a promising means. Rootstocks contribute to the regulation of scion vigor and water consumption, modulate scion phenological development and determine resource availability by root system architecture development. There is, however, a lack of knowledge on spatio-temporal root system development of rootstock genotypes and its interactions with environment and management that prevents efficient knowledge transfer into practice. Hence, winegrowers take only limited advantage of the large variability of existing rootstock genotypes. Models of vineyard water balance combined with root architectural models, using both static and dynamic representations of the root system, seem promising tools to match rootstock genotypes to frequently occurring future drought stress scenarios and address scientific knowledge gaps. In this perspective, we discuss how current developments in vineyard water balance modeling may provide the background for a better understanding of the interplay of rootstock genotypes, environment and management. We argue that root architecture traits are key drivers of this interplay, but our knowledge on rootstock architectures in the field remains limited both qualitatively and quantitatively. We propose phenotyping methods to help close current knowledge gaps and discuss approaches to integrate phenotyping data into different models to advance our understanding of rootstock x environment x management interactions and predict rootstock genotype performance in a changing climate. This could also provide a valuable basis for optimizing breeding efforts to develop new grapevine rootstock cultivars with optimal trait configurations for future growing conditions.
No related grants have been discovered for Jason Smith.