Early allopolyploid evolution in the post-Neolithic[i] Brassica napus[/i] oilseed genome

Boulos Chalhoub 1, * France Denoeud 2 Shengyi Liu 3 Isobel A. P. Parkin 4 Haibao Tang 5, 6 Xiyin Wang 7, 8 Julien Chiquet 9 Harry Belcram 1 Chaobo Tong 3 Birgit Samans 10 Margot Corréa 11 Corinne da Silva 11 Jérémy Just 1 Cyril Falentin 12 Chu Shin Koh 13 Isabelle Le Clainche 1 Maria Bernard 11 Pascal Bento 11 Benjamin Noel 11 Karine Labadie 11 Adriana Alberti 11 Mathieu Charles 14, 15 Dominique Arnaud 1 Hui Guo 16 Christian Daviaud 17 Salman Alamery 18 Kamel Jabbari 1, 19 Meixia Zhao 20 Patrick P. Edger 21 Houda Chelaifa-Ammari 1 David Tack 22 Gilles Lassalle 12 Imen Mestiri 1 Nicolas Schnel 12 Marie-Christine Le Paslier 14, 15 Guangyi Fan 23 Victor Renault 24 Philippe E. Bayer 18 Agnieszka A. Golicz 18 Sahana Manoli 18 Tae-Ho Lee 25 Vinh Ha Dinh Thi 1 Smahane Chalabi 1 Qiong Hu 3 Chuchuan Fan 26 Reece Tollenaere 18 Yunhai Lu 1 Christophe Battail 11 Jinxiong Shen 26 Christine H. D. Sidebottom 13 Xinfa Wang 3 Aurelie Canaguier 1 Aurelie Chauveau 14, 15 Aurélie Berard 14, 15 Gwenaëlle Deniot 12 Mei Guan 27 Zhongsong Liu 27 Fengming Sun 23 Yong Pyo Lim 28 Eric Lyons 29 Christopher D. Town 29 Ian Bancroft 30 Xiaowu Wang 31 Jinling Meng 26 Jianxin Ma 20 J. Chris Pires 32 Graham J. King 33 Dominique Brunel 14 Regine Delourme 12 Michel Renard 12 Jean-Marc Aury 11 Keith L. Adams 22 Jacqueline Batley 18, 34 Rod J. Snowdon 10 Jörg Tost 35 David Edwards 18, 34 Yongming Zhou 26 Wei Hua 3 Andrew G. Sharpe 13 Andrew H. Paterson 25 Chunyun Guan 27 Patrick Wincker 2
* Corresponding author
Abstract : Oilseed rape (Brassica napus L.) was formed ~7500 years ago by hybridization between B. rapa and B. oleracea, followed by chromosome doubling, a process known as allopolyploidy. Together with more ancient polyploidizations, this conferred an aggregate 72× genome multiplication since the origin of angiosperms and high gene content. We examined the B. napus genome and the consequences of its recent duplication. The constituent An and Cn subgenomes are engaged in subtle structural, functional, and epigenetic cross-talk, with abundant homeologous exchanges. Incipient gene loss and expression divergence have begun. Selection in B. napus oilseed types has accelerated the loss of glucosinolate genes, while preserving expansion of oil biosynthesis genes. These processes provide insights into allopolyploid evolution and its relationship with crop domestication and improvement
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Boulos Chalhoub, France Denoeud, Shengyi Liu, Isobel A. P. Parkin, Haibao Tang, et al.. Early allopolyploid evolution in the post-Neolithic[i] Brassica napus[/i] oilseed genome. Science, American Association for the Advancement of Science, 2014, 345 (6199), pp.950-953. ⟨10.1126/science.1253435⟩. ⟨hal-01208705⟩

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