Modelling grape growth in relation to whole-plant carbon and water fluxes

Stefano Poni, Junqi Zhu, Michel Génard, Gregory A. Gambetta, Philippe Vivin, Gilles Vercambre, Michael C.T. Trought, Nathalie Ollat, Serge Delrot, Zhanwu Dai

Risultato della ricerca: Contributo in rivistaArticolo in rivista

19 Citazioni (Scopus)

Abstract

The growth of fleshy fruits is still poorly understood as a result of the complex integration of water and solute fluxes, cell structural properties, and the regulation of whole plant source–sink relationships. To unravel the contribution of these processes to berry growth, a biophysical grape (Vitis vinifera L.) berry growth module was developed and integrated with a whole-plant functional–structural model, and was calibrated on two varieties, Cabernet Sauvignon and Sangiovese. The model captured well the variations in growth and sugar accumulation caused by environmental conditions, changes in leaf-to-fruit ratio, plant water status, and varietal differences, with obvious future application in predicting yield and maturity under a variety of production contexts and regional climates. Our analyses illustrated that grapevines strive to maintain proper ripening by partially compensating for a reduced source–sink ratio, and that under drought an enhanced berry sucrose uptake capacity can reverse berry shrinkage. Sensitivity analysis highlighted the importance of phloem hydraulic conductance, sugar uptake, and surface transpiration on growth, while suggesting that cell wall extensibility and the turgor threshold for cell expansion had minor effects. This study demonstrates that this integrated model is a useful tool in understanding the integration and relative importance of different processes in driving fleshy fruit growth.
Lingua originaleEnglish
pagine (da-a)2505-2521
Numero di pagine17
RivistaJournal of Experimental Botany
Volume70
DOI
Stato di pubblicazionePubblicato - 2019

Keywords

  • Fruit expansive growth
  • phloem hydraulic conductance
  • sink-driven carbon allocation
  • xylem water potential

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