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Cakpo CB, Vercambre G, Baldazzi V, Roch L, Dai Z, Valsesia P, Memah MM, Colombié S, Moing A, Gibon Y, Génard M. Model-assisted comparison of sugar accumulation patterns in ten fleshy fruits highlights differences between herbaceous and woody species. ANNALS OF BOTANY 2020; 126:455-470. [PMID: 32333754 PMCID: PMC7424760 DOI: 10.1093/aob/mcaa082] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2019] [Accepted: 04/23/2020] [Indexed: 05/13/2023]
Abstract
BACKGROUND AND AIMS Sugar concentration is a key determinant of fruit quality. Soluble sugars and starch concentrations in fruits vary greatly from one species to another. The aim of this study was to investigate similarities and differences in sugar accumulation strategies across ten contrasting fruit species using a modelling approach. METHODS We developed a coarse-grained model of primary metabolism based on the description of the main metabolic and hydraulic processes (synthesis of compounds other than sugar and starch, synthesis and hydrolysis of starch, and water dilution) involved in the accumulation of soluble sugars during fruit development. KEY RESULTS Statistical analyses based on metabolic rates separated the species into six groups according to the rate of synthesis of compounds other than sugar and starch. Herbaceous species (cucumber, tomato, eggplant, pepper and strawberry) were characterized by a higher synthesis rate than woody species (apple, nectarine, clementine, grape and kiwifruit). Inspection of the dynamics of the processes involved in sugar accumulation revealed that net sugar importation, metabolism and dilution processes were remarkably synchronous in most herbaceous plants, whereas in kiwifruit, apple and nectarine, processes related to starch metabolism were temporally separated from other processes. Strawberry, clementine and grape showed a distinct dynamic compared with all other species. CONCLUSIONS Overall, these results provide fresh insights into species-specific regulatory strategies and into the role of starch metabolism in the accumulation of soluble sugars in fleshy fruits. In particular, inter-specific differences in development period shape the co-ordination of metabolic processes and affect priorities for carbon allocation across species. The six metabolic groups identified by our analysis do not show a clear separation into climacteric and non-climacteric species, possibly suggesting that the metabolic processes related to sugar concentration are not greatly affected by ethylene-associated events.
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Affiliation(s)
- Coffi Belmys Cakpo
- INRAE, UR1115, Unité Plantes et Systèmes de Culture Horticoles, Avignon, France
| | - Gilles Vercambre
- INRAE, UR1115, Unité Plantes et Systèmes de Culture Horticoles, Avignon, France
| | - Valentina Baldazzi
- INRAE, UR1115, Unité Plantes et Systèmes de Culture Horticoles, Avignon, France
- Université Côte d’Azur, INRAE, CNRS, Institut Sophia Agrobiotech, Sophia-Antipolis, France
- Université Côte d’Azur, Inria, INRAE, Sorbonne Université, BIOCORE, Sophia-Antipolis, France
| | - Léa Roch
- INRAE, Univ. Bordeaux, UMR1332 Biologie du Fruit et Pathologie, Villenave d’Ornon, France
| | - Zhanwu Dai
- EGFV, Bordeaux Sciences Agro, INRAE, Université de Bordeaux, Villenave d’Ornon, France
- Beijing Key Laboratory of Grape Science and Enology and Key Laboratory of Plant Resources, Institute of Botany, Chinese Academy of Sciences, Beijing, China
| | - Pierre Valsesia
- INRAE, UR1115, Unité Plantes et Systèmes de Culture Horticoles, Avignon, France
| | | | - Sophie Colombié
- INRAE, Univ. Bordeaux, UMR1332 Biologie du Fruit et Pathologie, Villenave d’Ornon, France
| | - Annick Moing
- INRAE, Univ. Bordeaux, UMR1332 Biologie du Fruit et Pathologie, Villenave d’Ornon, France
- Bordeaux Metabolome Facility– MetaboHUB, Villenave d’Ornon, France
| | - Yves Gibon
- INRAE, Univ. Bordeaux, UMR1332 Biologie du Fruit et Pathologie, Villenave d’Ornon, France
| | - Michel Génard
- INRAE, UR1115, Unité Plantes et Systèmes de Culture Horticoles, Avignon, France
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