title: Inter-Species Comparative Analysis of Components of Soluble Sugar Concentration in Fleshy Fruits.
abstract: 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.
authors.affiliation: EGFV, Bordeaux Sciences Agro, INRA, Université de Bordeaux Villenave d'Ornon, France.
authors.forename: Zhanwu
authors.initials: Z
authors.lastname: Dai
authors.affiliation: EGFV, Bordeaux Sciences Agro, INRA, Université de Bordeaux Villenave d'Ornon, France.
authors.forename: Huan
authors.initials: H
authors.lastname: Wu
authors.affiliation: INRA, UR1115, Plantes et Systèmes de Culture Horticoles Avignon, France.
authors.forename: Valentina
authors.initials: V
authors.lastname: Baldazzi
authors.affiliation: Bordeaux Sciences Agro, ISVV, UMR 1287 EGFV Villenave d' Ornon, France.
authors.forename: Cornelis
authors.initials: C
authors.lastname: van Leeuwen
authors.affiliation: INRA, UR1115, Plantes et Systèmes de Culture Horticoles Avignon, France.
authors.forename: Nadia
authors.initials: N
authors.lastname: Bertin
authors.affiliation: INRA, UR1115, Plantes et Systèmes de Culture Horticoles Avignon, France.
authors.forename: Hélène
authors.initials: H
authors.lastname: Gautier
authors.affiliation: Institute of Botany - Chinese Academy of Sciences Beijing, China.
authors.forename: Benhong
authors.initials: B
authors.lastname: Wu
authors.affiliation: INRA, UMR 1131 SVQV Colmar, France.
authors.forename: Eric
authors.initials: E
authors.lastname: Duchêne
authors.affiliation: EGFV, Bordeaux Sciences Agro, INRA, Université de Bordeaux Villenave d'Ornon, France.
authors.forename: Eric
authors.initials: E
authors.lastname: Gomès
authors.affiliation: EGFV, Bordeaux Sciences Agro, INRA, Université de Bordeaux Villenave d'Ornon, France.
authors.forename: Serge
authors.initials: S
authors.lastname: Delrot
authors.affiliation: INRA, UR1115, Plantes et Systèmes de Culture Horticoles Avignon, France.
authors.forename: Françoise
authors.initials: F
authors.lastname: Lescourret
authors.affiliation: INRA, UR1115, Plantes et Systèmes de Culture Horticoles Avignon, France.
authors.forename: Michel
authors.initials: M
authors.lastname: Génard
keywords: dilution; fruit metabolism; grape; peach; sugar importation; tomato