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Nationalité : Chine
Courriel : weiwei.yang@inrae.fr

Sujet de recherche

Deciphering intra-bunch grape heterogeneity by modeling 3D bunch architecture and biophysical berry growth in complex vascular (phloem and xylem) network

• Durée : 08/03/2019 - 30/10/2021
• Encadrant : Greg GAMBETTA / Zhanwu DAI
• Financement : China Scholarship Council
• Projet : 3DBerryarch

Résumé

Grape is one of the most economically important fruit species, for fresh fruit, raisin, or wine. High quality grape is the prerequisite for producing premium wines. High quality is not only referring to mean values of the quality, but also relates with the homogeneity of grape quality. Because grape inflorescence that later forms grape bunch is botanically considered a panicle, intra-bunch heterogeneity has been extensively observed in grape and is one of important factors influencing the homogeneity of grape quality. The main objective of this project is to decipher the underlying processes influencing intra-bunch heterogeneity of berry size by developing a grape bunch module including 3D bunch architecture, bunch microclimate, vascular transport in complex architecture, and fruit growth. It will allow us testing the hypothesis that the relative contributions of 3D bunch architecture (consequently bunch microclimate) and vascular transport on intra-bunch heterogeneity of berry size change with berry development. To fulfill the goal, we plan to phenotype bunch 3D architecture, the topology structure of stalk, growth of rachis and berry, construct bunch microclimate simulation based on energy balance, describe the vascular transport based on the topology structure, and apply the biophysical berry growth model to each berry. Three grapevine cultivars with distinct bunch architecture will be used. The results will be not only interested by the grape research community, but will also be appeal for community working on crops or fruits with a panicle structure. It will also open possibilities to evaluate the linkage between bunch architecture and bunch rot in collaboration with pathologist in the future.