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Post Facebook THE GARDEN'S  SECRETS
Impressive late blooms to dicover in the Rockeries. Don't miss out!
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NEWS
Les bienfaits des arbres importés
 A joint CJBG/UNIGE
 study shows the
 benefits of imported
 trees.
 Read the press
 review
(in French)
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The <em>Botalista</em> Association is born!
 The botanical Gardens
 of Geneva, Bern and
 Bordeaux launch the
 Botalista Association.
 More info HERE.
 Read the press
 release
(in French)
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Seeds and everything around them
 Genève Grandeur
 Nature
 Seeds and everything
 around them
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Plan Biodiversité 2020-2023
 The 2020-2023 Biodi-
 versity Plan approuved
 by the State Council.
 The CJBG greatly
 contributed to the
 objectives' definition
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PUBLICATION
Scientific strategy 2020 - 2030
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GUIDED TOURS
GUIDED TOURS
THE GUIDED TOURS ARE BACK!
From October to December
Compulsory registration 3 days before
Next visits:
Botanical variations:
October 27th
The Symbiosis
with P.Clerc
Sunday visits:
November 1st
Lichens
with P.Clerc
OR
Trees: relics of the Tiertiary period
with C.Christe & Y. Naciri
Check out the programme
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EXHIBITION
Carl von Martius Exhibition
Carl von Martius: discovering tropical biodiversity
In the CJBG Library
Until May 31st 2021
Watch the TEASER
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FAMILY ACTIVITIES
Carl von Martius Exhibition
During autumn break, discover the tropics with your family !
Download your Exploration booklet or leaf through it directly online (in French).
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Botany Cultural Trail
The "Botany" Cultural Trail
Discover the botany in Geneva since the 18th century
The visit begins HERE!
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VISIT THE GREENHOUSES
tropical greenhouse
Presentation of the tropical greenhouse (run time: 1'30)
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THE HESPERIDES' TREASURE
Symboles & Sentiments
Interactive and mutlimedia fiction !
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Conservatoire et Jardin botaniques de la Ville de Genve


WelcomeM. Perret
Evolution of pollination systems and the diversification of angiosperms in the Neotropics
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Evolution of pollination systems and the diversification of angiosperms in the Neotropics

Evolution of plant diversity in the Neotropics

Evolution de la diversification des plantes dans les Néotropiques

Stakeholders: M. Perret, M. Serrano Serrano, Prof. N. Salamin (University of Lausanne).

Our projects aim to better understand the processes that contribute to the origin and maintenance of the outstanding diversity of Neotropical plants. We focus on the sub-family Gesnerioideae, a monophyletic group of 1050 species distributed in various biomes of tropical America. Its large variation in ecological and phenotypic traits makes the group an excellent model taxon to study diversification. Using new and available DNA we produced a global phylogenetic tree for the Gesnerioideae with a complete species sampling in several lineages. Based on this historical framework, we reconstructed the evolution of pollination systems (i.e., hummingbirds, bees or bats) and evaluate their impact on diversification rates.

We identified a high frequency of pollinator transitions between hummingbirds and insects since 25 Mya, coinciding with the arrival of hummingbirds in South America. We demonstrated that floral specialization on hummingbirds for pollination has triggered rapid diversification in the Gesneriaceae family, and that it represents one of the oldest identified plant-hummingbird associations.

To further explore the molecular changes associated with pollinator transitions, we sequenced flower transcriptomes of six Gesneriaceae species. We hope this data will contribute to identify the genes and the mechanisms responsible for the convergent evolution of flower traits promoting specialized interactions with hummingbirds.

Related publications:

Serrano-Serrano M. L., A. Marcionetti, M. Perret and N. Salamin. 2017. Transcriptomic resources for an endemic Neotropical plant lineage (Gesneriaceae). Applications in Plant Sciences 5(4): 1600135; http://www.bioone.org/loi/apps

Serrano-Serrano M. L., J. Rolland, J. L. Clark, N. Salamin and M. Perret. 2017.
Hummingbird pollination and the diversification of angiosperms: an old and successful association in Gesneriaceae. Proceedings of the Royal Society B 284: 20162816.

Serrano-Serrano M. L. 2016.
Correlates and genetic basis of plant diversification in the neotropics: the gesneriaceae as a case study. PhD thesis, University of Lausanne, Switzerland.

Serrano-Serrano M. L., M. Perret, M. Guignard, A. Chautems, D. Silvestro and N. Salamin. 2015.
Decoupled evolution of floral traits and climatic preferences in a clade of Neotropical Gesneriaceae. BMC Evolutionary Biology 15: 247

Perret, M., A. Chautems, R. Spichiger, T. G. Barraclough, and V. Savolainen. 2007. The geographical pattern of speciation and floral diversification in the Neotropics : the tribe Sinningieae (Gesneriaceae) as a case study. Evolution 61 :1641-1660.