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On the evolution of fleshy fruits: An integrative test to assess the relative role of intrinsic and extrinsic factors in shaping fruit type

Project description

Dissecting the evolution of fleshy fruits

There is an amazing diversity of fruits available to us today. This wide variety is the result of selective pressures from different factors, such as the environment or inherited genes. To determine their relative contribution to fruit evolution, integrative analysis is key. The EU-funded FRUITFUL project will use such an approach to study the evolution of fleshy fruits in the olive family. They will identify independent transitions to fleshy fruit, analysing representative genes in fruit species, determining the olive’s geographical distribution and integrating all results in causal models. The project’s approach will provide a better understanding of the patterns of major evolutionary change.

Objective

A trip to a grocery store exposes us to an outstanding diversity of fruits. While this variety was influenced by human selection during plant domestication, it mainly reflects strategies of seed dispersal that evolved over millions of years. Despite the huge variation in fruit color, shape, and size, common patterns can still be identified, especially the repeated evolution of fleshy fruits (e.g. olives, apples, tomatoes). Though this pattern is well observed, we are still exploring the role of different factors and their selective pressures. These can be intrinsic, as evolution of inherited genes determining fruit traits, or extrinsic, as the environment. To date, studies have focused on one or two major factors at a time, but their relative contributions requires an integrative analysis.
FRUITFUL will dissect the evolution of fleshy fruits in the olive family. Oleaceae is the ideal study subject here because it presents a natural comparative set-up for fruit evolution: multiple lineages that independently evolved fleshy fruits; species living in a variety of environments; and diverse seed dispersers. Further, several genomes and transcriptomes of Oleaceae were recently released.
In this project, I will: (1) identify independent transitions to fleshy fruit within a comprehensive phylogenetic framework of Oleaceae; (2) use phylogenomic approaches to analyze representative genes in species with fleshy or dry fruits, and test for switches in selective pressures in relation to trait transitions; (3) estimate the historical biogeography of the family, along with current environmental preferences of species, and their seed dispersers; and finally, (4) integrate all results in models of causal relationships, and identify direct and indirect effects, and their magnitudes, among variables and fruit type. FRUITFUL’s interdisciplinary research and novel integrative approach will provide new insights into understanding the patterns observed at a macroevolutionary scale.

Coordinator

UNIVERSITE PAUL SABATIER TOULOUSE III
Net EU contribution
€ 295 061,76
Address
ROUTE DE NARBONNE 118
31062 Toulouse Cedex 9
France

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Region
Occitanie Midi-Pyrénées Haute-Garonne
Activity type
Higher or Secondary Education Establishments
Links
Total cost
€ 295 061,76