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The genomes of pecan and Chinese hickory provide insights into Carya evolution and nut nutrition

2019; University of Oxford; Volume: 8; Issue: 5 Linguagem: Inglês

10.1093/gigascience/giz036

2047-217X

Youjun Huang, Lihong Xiao, Zhongren Zhang, Rui Zhang, Zhengjia Wang, Chunying Huang, Ren Huang, Yumeng Luan, Tongqiang Fan, Jianhua Wang, Chen Shen, Shenmei Zhang, Xinwang Wang, Jennifer J. Randall, Bingsong Zheng, Jiasheng Wu, Qixiang Zhang, Guohua Xia, Chuanmei Xu, Ming Chen, Liangsheng Zhang, Wenkai Jiang, Li‐Zhi Gao, Zhiduan Chen, Charles A. Leslie, L.J. Grauke, Jianqin Huang,

Plant and Fungal Interactions Research

Abstract Background Pecan (Carya illinoinensis) and Chinese hickory (C. cathayensis) are important commercially cultivated nut trees in the genus Carya (Juglandaceae), with high nutritional value and substantial health benefits. Results We obtained >187.22 and 178.87 gigabases of sequence, and ~288× and 248× genome coverage, to a pecan cultivar (“Pawnee”) and a domesticated Chinese hickory landrace (ZAFU-1), respectively. The total assembly size is 651.31 megabases (Mb) for pecan and 706.43 Mb for Chinese hickory. Two genome duplication events before the divergence from walnut were found in these species. Gene family analysis highlighted key genes in biotic and abiotic tolerance, oil, polyphenols, essential amino acids, and B vitamins. Further analyses of reduced-coverage genome sequences of 16 Carya and 2 Juglans species provide additional phylogenetic perspective on crop wild relatives. Conclusions Cooperative characterization of these valuable resources provides a window to their evolutionary development and a valuable foundation for future crop improvement.