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Cassava genome from a wild ancestor to cultivated varieties

2014; Nature Portfolio; Volume: 5; Issue: 1 Linguagem: Inglês

10.1038/ncomms6110

2041-1723

Wenquan Wang, Binxiao Feng, Jingfa Xiao, Zhiqiang Xia, Xincheng Zhou, Pinghua Li, Weixiong Zhang, Ying Wang, Birger Lindberg Møller, Peng Zhang, Ming‐Cheng Luo, Gong Xiao, Jin‐Xing Liu, Jun Yang, Songbi Chen, Pablo D. Rabinowicz, Xin Chen, Hong‐Bin Zhang, Hernán Ceballos, Qunfeng Lou, Meiling Zou, Luiz Joaquim Castelo Branco Carvalho, Changying Zeng, Jing Xia, Shixiang Sun, Yuhua Fu, Haiyan Wang, Cheng Lu, Mengbin Ruan, Shuigeng Zhou, Zhicheng Wu, Hui Liu, Rubini Kannangara, Kirsten Jörgensen, Rebecca Louise Neale, Maya Bonde, Nanna Heinz, Zhu Wenli, Shujuan Wang, Yang Zhang, Kun Pan, Mingfu Wen, Ping-An Ma, Zhengxu Li, Meizhen Hu, Wenbin Liao, Wenbin Hu, Shengkui Zhang, Jinli Pei, Anping Guo, Jianchun Guo, Jiaming Zhang, Zhengwen Zhang, Jianqiu Ye, Wenjun Ou, Yaqin Ma, Xinyue Liu, Luke J. Tallon, Kevin Galens, Sandra Ott, Jie Huang, Jingjing Xue, Feifei An, Qingqun Yao, Xiaojing Lu, Martín Fregene, Luís Augusto Becerra López‐Lavalle, Jiajie Wu, Frank M. You, Meili Chen, Songnian Hu, Guojiang Wu, Silin Zhong, Ling Peng, Yeyuan Chen, Qinghuang Wang, Guodao Liu, Bin Liu, Kaimian Li, Ming Peng,

Plant Micronutrient Interactions and Effects

Abstract Cassava is a major tropical food crop in the Euphorbiaceae family that has high carbohydrate production potential and adaptability to diverse environments. Here we present the draft genome sequences of a wild ancestor and a domesticated variety of cassava and comparative analyses with a partial inbred line. We identify 1,584 and 1,678 gene models specific to the wild and domesticated varieties, respectively, and discover high heterozygosity and millions of single-nucleotide variations. Our analyses reveal that genes involved in photosynthesis, starch accumulation and abiotic stresses have been positively selected, whereas those involved in cell wall biosynthesis and secondary metabolism, including cyanogenic glucoside formation, have been negatively selected in the cultivated varieties, reflecting the result of natural selection and domestication. Differences in microRNA genes and retrotransposon regulation could partly explain an increased carbon flux towards starch accumulation and reduced cyanogenic glucoside accumulation in domesticated cassava. These results may contribute to genetic improvement of cassava through better understanding of its biology.