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Journal Articles Nature Year : 2011

The Medicago genome provides insight into the evolution of rhizobial symbioses

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Nevin D. Young
  • Function : Correspondent author
Yves van de Peer
Sebastian Proost
Benjamin Rosen
Haibao Tang
Valérie Barbe
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Anne Berger
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Nathalie Choisne
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Arnaud Couloux
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Stéphanie Fouteau
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Axin Hua
  • Function : Author
Sean Humphray
  • Function : Author
Yi Jing
  • Function : Author
Ghislaine Magdelenat
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Lucy Matthews
  • Function : Author
Julie Poulain
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Claire Riddle
  • Function : Author
Sylvie Samain
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Claude Scarpelli
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Béatrice Ségurens
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Sarah Sims
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Susan R. Singer
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Lieven Sterck
Agnès Viollet
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Mingyi Wang
  • Function : Author
Graham B. Wiley
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Patrick Wincker
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Ziyun Yao
  • Function : Author
Fu Ying
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David C. Schwartz
  • Function : Author
Jane Rogers
  • Function : Author
Francis Quétier
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Abstract

Legumes (Fabaceae or Leguminosae) are unique among cultivated plants for their ability to carry out endosymbiotic nitrogen fixation with rhizobial bacteria, a process that takes place in a specialized structure known as the nodule. Legumes belong to one of the two main groups of eurosids, the Fabidae, which includes most species capable of endosymbiotic nitrogen fixation1. Legumes comprise several evolutionary lineages derived from a common ancestor 60 million years ago (Myr ago). Papilionoids are the largest clade, dating nearly to the origin of legumes and containing most cultivated species2. Medicago truncatula is a long-established model for the study of legume biology. Here we describe the draft sequence of the M. truncatula euchromatin based on a recently completed BAC assembly supplemented with Illumina shotgun sequence, together capturing ~94% of all M. truncatula genes. A whole-genome duplication (WGD) approximately 58 Myr ago had a major role in shaping the M. truncatula genome and thereby contributed to the evolution of endosymbiotic nitrogen fixation. Subsequent to the WGD, the M. truncatula genome experienced higher levels of rearrangement than two other sequenced legumes, Glycine max and Lotus japonicus. M. truncatula is a close relative of alfalfa (Medicago sativa), a widely cultivated crop with limited genomics tools and complex autotetraploid genetics. As such, the M. truncatula genome sequence provides significant opportunities to expand alfalfa’s genomic toolbox.

Dates and versions

hal-02652790 , version 1 (29-05-2020)

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Nevin D. Young, Frederic Debellé, Giles E. D. Oldroyd, Rene Geurts, Steven Cannon, et al.. The Medicago genome provides insight into the evolution of rhizobial symbioses. Nature, 2011, 480 (7378), pp.520-524. ⟨10.1038/nature10625⟩. ⟨hal-02652790⟩
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