Systematics, biogeography, and character evolution of the legume tribe Fabeae with special focus on the middle-Atlantic island lineages

BMC Evolutionary Biology

Mark A Carine³  Gregory Kenicer⁴  R Toby Pennington⁴  Miguel Menezes de Sequeira⁵  Arnoldo Santos-Guerra¹  Paulina Hechenleitner⁴  Hanno Schaefer² 

[1] Unidad de Botánica (ICIA). C/Retama, 2, 38400, Puerto de La Cruz, Tenerife, Islas, Canarias, Spain;Plant Biodiversity Research, Technische Universität München, Maximus-von-Imhof Forum 2, Freising, D-85354, Germany;Plants Division, Department of Life Sciences, The Natural History Museum, Cromwell Road, London, SW7 5BD, United Kingdom;Royal Botanic Garden Edinburgh, 20A Inverleith Row, Edinburgh, EH3 5LR, United Kingdom;Universidade da Madeira, Centro de Ciências da Vida, Funchal, Madeira, Portugal

关键词: Vicia;    Pisum;    Pea;    Macaronesia;    Long-distance dispersal;    Lentil;    Legumes;    Lathyrus;   

Others  :  1130528
DOI  :  10.1186/1471-2148-12-250

 received in 2012-08-03, accepted in 2012-12-20,  发布年份 2012

【 摘 要 】

Background

Tribe Fabeae comprises about 380 legume species, including some of the most ancient and important crops like lentil, pea, and broad bean. Breeding efforts in legume crops rely on a detailed knowledge of closest wild relatives and geographic origin. Relationships within the tribe, however, are incompletely known and previous molecular results conflicted with the traditional morphology-based classification. Here we analyse the systematics, biogeography, and character evolution in the tribe based on plastid and nuclear DNA sequences.

Results

Phylogenetic analyses including c. 70% of the species in the tribe show that the genera Vicia and Lathyrus in their current circumscription are not monophyletic: Pisum and Vavilovia are nested in Lathyrus, the genus Lens is nested in Vicia. A small, well-supported clade including Vicia hirsuta, V. sylvatica, and some Mediterranean endemics, is the sister group to all remaining species in the tribe. Fabeae originated in the East Mediterranean region in the Miocene (23–16 million years ago (Ma)) and spread at least 39 times into Eurasia, seven times to the Americas, twice to tropical Africa and four times to Macaronesia. Broad bean (V. faba) and its sister V. paucijuga originated in Asia and might be sister to V. oroboides. Lentil (Lens culinaris ssp. culinaris) is of Mediterranean origin and together with eight very close relatives forms a clade that is nested in the core Vicia, where it evolved c. 14 Ma. The Pisum clade is nested in Lathyrus in a grade with the Mediterranean L. gloeosperma, L. neurolobus, and L. nissolia. The extinct Azorean endemic V. dennesiana belongs in section Cracca and is nested among Mediterranean species. According to our ancestral character state reconstruction results, ancestors of Fabeae had a basic chromosome number of 2n=14, an annual life form, and evenly hairy, dorsiventrally compressed styles.

Conclusions

Fabeae evolved in the Eastern Mediterranean in the middle Miocene and spread from there across Eurasia, into Tropical Africa, and at least seven times to the Americas. The middle-Atlantic islands were colonized four times but apparently did not serve as stepping-stones for Atlantic crossings. Long-distance dispersal events are relatively common in Fabeae (seven per ten million years). Current generic and infrageneric circumscriptions in Fabeae do not reflect monophyletic groups and should be revised. Suggestions for generic level delimitation are offered.

【 授权许可】

   
2012 Schaefer et al.; licensee BioMed Central Ltd.

【 图 表 】

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