Evolution of oil-producing trichomes in Sisyrinchium (Iridaceae): insights from the first comprehensive phylogenetic analysis of the genus. - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Annals of Botany Année : 2011

Evolution of oil-producing trichomes in Sisyrinchium (Iridaceae): insights from the first comprehensive phylogenetic analysis of the genus.

Olivier Chauveau
Lilian Eggers
  • Fonction : Auteur
Christian Raquin
  • Fonction : Auteur
Adriano Silvério
  • Fonction : Auteur
Corinne Cruaud
Eliane Kaltchuk-Santos
  • Fonction : Auteur
Roxana Yockteng
  • Fonction : Auteur
Tatiana T Souza-Chies
  • Fonction : Auteur
Sophie Nadot

Résumé

BACKGROUND AND AIMS: Sisyrinchium (Iridaceae: Iridoideae: Sisyrinchieae) is one of the largest, most widespread and most taxonomically complex genera in Iridaceae, with all species except one native to the American continent. Phylogenetic relationships within the genus were investigated and the evolution of oil-producing structures related to specialized oil-bee pollination examined. METHODS: Phylogenetic analyses based on eight molecular markers obtained from 101 Sisyrinchium accessions representing 85 species were conducted in the first extensive phylogenetic analysis of the genus. Total evidence analyses confirmed the monophyly of the genus and retrieved nine major clades weakly connected to the subdivisions previously recognized. The resulting phylogenetic hypothesis was used to reconstruct biogeographical patterns, and to trace the evolutionary origin of glandular trichomes present in the flowers of several species. KEY RESULTS AND CONCLUSIONS: Glandular trichomes evolved three times independently in the genus. In two cases, these glandular trichomes are oil-secreting, suggesting that the corresponding flowers might be pollinated by oil-bees. Biogeographical patterns indicate expansions from Central America and the northern Andes to the subandean ranges between Chile and Argentina and to the extended area of the Paraná river basin. The distribution of oil-flower species across the phylogenetic trees suggests that oil-producing trichomes may have played a key role in the diversification of the genus, a hypothesis that requires future testing.

Dates et versions

hal-00855940 , version 1 (30-08-2013)

Identifiants

Citer

Olivier Chauveau, Lilian Eggers, Christian Raquin, Adriano Silvério, Spencer Brown, et al.. Evolution of oil-producing trichomes in Sisyrinchium (Iridaceae): insights from the first comprehensive phylogenetic analysis of the genus.. Annals of Botany, 2011, 107 (8), pp.1287-312. ⟨10.1093/aob/mcr080⟩. ⟨hal-00855940⟩
75 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More