Application of a SUGAR model to analyse sugar accumulation in peach cultivars that differ in glucose–fructose ratio

Wu, Benhong; Quilot, Bénédicte; Génard, Michel; Li, S. H.; Zhao, Jianbo; Yang, Jingjing; Wang, Y. Q.

doi:10.1017/s0021859611000438

Cited by 17 publications

(14 citation statements)

References 38 publications

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“…For grape, the WC was empirically determined as a function of soluble sugar concentration ( Garcia de Cortazar-Atauri et al, 2009 ). Soluble sugars were measured either with enzymatic method ( Génard et al, 2003 ; Prudent et al, 2009 ) or HPLC method ( Wu et al, 2012 ). For some grape samples, TSSs ( o Brix) were determined using a PAL-1 portable electronic refractometer and an empirical relationship was then applied to transform o Brix into hexose concentration ( OIV, 2009 ).…”

Section: Methodsmentioning

confidence: 99%

Inter-Species Comparative Analysis of Components of Soluble Sugar Concentration in Fleshy Fruits

Dai

Baldazzi

et al. 2016

Front. Plant Sci.

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The soluble sugar concentration of fleshy fruit is a key determinant of fleshy fruit quality. It affects directly the sweetness of fresh fruits and indirectly the properties of processed products (e.g., alcohol content in wine). Despite considerable divergence among species, soluble sugar accumulation in a fruit results from the complex interplay of three main processes, namely sugar import, sugar metabolism, and water dilution. Therefore, inter-species comparison would help to identify common and/or species-specific modes of regulation in sugar accumulation. For this purpose, a process-based mathematical framework was used to compare soluble sugar accumulation in three fruits: grape, tomato, and peach. Representative datasets covering the time course of sugar accumulation during fruit development were collected. They encompassed 104 combinations of species (3), genotypes (30), and growing conditions (19 years and 16 nutrient and environmental treatments). At maturity, grape showed the highest soluble sugar concentrations (16.5–26.3 g/100 g FW), followed by peach (2.2 to 20 g/100 g FW) and tomato (1.4 to 5 g/100 g FW). Main processes determining soluble sugar concentration were decomposed into sugar importation, metabolism, and water dilution with the process-based analysis. Different regulation modes of soluble sugar concentration were then identified, showing either import-based, dilution-based, or import and dilution dual-based. Firstly, the higher soluble sugar concentration in grape than in tomato is a result of higher sugar importation. Secondly, the higher soluble sugar concentration in grape than in peach is due to a lower water dilution. The third mode of regulation is more complicated than the first two, with differences both in sugar importation and water dilution (grape vs. cherry tomato; cherry tomato vs. peach; peach vs. tomato). On the other hand, carbon utilization for synthesis of non-soluble sugar compounds (namely metabolism) was conserved among the three fruit species. These distinct modes appear to be quite species-specific, but the intensity of the effect may significantly vary depending on the genotype and management practices. These results provide novel insights into the drivers of differences in soluble sugar concentration among fleshy fruits.

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Section: Methodsmentioning

confidence: 99%

Inter-Species Comparative Analysis of Components of Soluble Sugar Concentration in Fleshy Fruits

Dai

Baldazzi

et al. 2016

Front. Plant Sci.

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“…This model was used to explore the natural phenotypic diversity of peach fruits. In particular, special attention was given to observed differences in the fructose-to-glucose ratio (Wu et al, 2012). Despite having satisfactory agreement with experimental data, the structure of the model proposed by G enard and Souty (1996) was too simple and gave little evidence to support a hypothesis that explains low fructose concentration.…”

Section: Introductionmentioning

confidence: 99%

A kinetic model of sugar metabolism in peach fruit reveals a functional hypothesis of a markedly low fructose‐to‐glucose ratio phenotype

Desnoues

Génard²,

Quilot-Turion

et al. 2018

The Plant Journal

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The concentrations of sugars in fruit vary with fruit development, environment and genotype. In general, there were weak correlations between the variations in sugar concentrations and the activities of enzymes directly related with the synthesis or degradation of sugars. This finding suggests that the relationships between enzyme activities and metabolites are often non-linear and are difficult to assess. To simulate the concentrations of sucrose, glucose, fructose and sorbitol during the development of peach fruit, a kinetic model of sugar metabolism was developed by taking advantage of recent profiling data. Cell compartmentation (cytosol and vacuole) was described explicitly, and data-driven enzyme activities were used to parameterize equations. The model correctly accounts for both annual and genotypic variations, which were observed in 10 genotypes derived from an interspecific cross. They provided important information on the mechanisms underlying the specification of phenotypic differences. In particular, the model supports the hypothesis that a difference in fructokinase affinity could be responsible for a low fructose-to-glucose ratio phenotype, which was observed in the studied population.

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“… Ranges of values for these parameters found in the literature are also shown. Ranges for the different parameters were taken from Harrison et al ( 1989 ), Lescourret and Génard ( 2005 ), Mirás-Avalos et al ( 2011 , 2013a , b ), and Wu et al ( 2012 ) . …”

Section: Methodsmentioning

confidence: 99%

Disentangling the Effects of Water Stress on Carbon Acquisition, Vegetative Growth, and Fruit Quality of Peach Trees by Means of the QualiTree Model

et al. 2018

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Climate change projections predict warmer and drier conditions. In general, moderate to severe water stress reduce plant vegetative growth and leaf photosynthesis. However, vegetative and reproductive growths show different sensitivities to water deficit. In fruit trees, water restrictions may have serious implications not only on tree growth and yield, but also on fruit quality, which might be improved. Therefore, it is of paramount importance to understand the complex interrelations among the physiological processes involved in within-tree carbon acquisition and allocation, water uptake and transpiration, organ growth, and fruit composition when affected by water stress. This can be studied using process-based models of plant functioning, which allow assessing the sensitivity of various physiological processes to water deficit and their relative impact on vegetative growth and fruit quality. In the current study, an existing fruit-tree model (QualiTree) was adapted for describing the water stress effects on peach (Prunus persica L. Batsch) vegetative growth, fruit size and composition. First, an energy balance calculation at the fruit-bearing shoot level and a water transfer formalization within the plant were integrated into the model. Next, a reduction function of vegetative growth according to tree water status was added to QualiTree. Then, the model was parameterized and calibrated for a late-maturing peach cultivar (“Elberta”) under semi-arid conditions, and for three different irrigation practices. Simulated vegetative and fruit growth variability over time was consistent with observed data. Sugar concentrations in fruit flesh were well simulated. Finally, QualiTree allowed for determining the relative importance of photosynthesis and vegetative growth reduction on carbon acquisition, plant growth and fruit quality under water constrains. According to simulations, water deficit impacted vegetative growth first through a direct effect on its sink strength, and; secondly, through an indirect reducing effect on photosynthesis. Fruit composition was moderately affected by water stress. The enhancements performed in the model broadened its predictive capabilities and proved that QualiTree allows for a better understanding of the water stress effects on fruit-tree functioning and might be useful for designing innovative horticultural practices in a changing climate scenario.

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Application of a SUGAR model to analyse sugar accumulation in peach cultivars that differ in glucose–fructose ratio

Cited by 17 publications

References 38 publications

Inter-Species Comparative Analysis of Components of Soluble Sugar Concentration in Fleshy Fruits

Inter-Species Comparative Analysis of Components of Soluble Sugar Concentration in Fleshy Fruits

A kinetic model of sugar metabolism in peach fruit reveals a functional hypothesis of a markedly low fructose‐to‐glucose ratio phenotype

Disentangling the Effects of Water Stress on Carbon Acquisition, Vegetative Growth, and Fruit Quality of Peach Trees by Means of the QualiTree Model

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