Extensive sequence divergence between the reference genomes of two elite indica rice varieties Zhenshan 97 and Minghui 63

Jianwei Zhang, Ling Ling Chen, Feng Xing, David A. Kudrna, Wen Yao, Dario Copetti, Ting Mu, Weiming Li, Jia Ming Song, Weibo Xie, Seunghee Lee, Jayson Talag, Lin Shao, Yue An, Chun Liu Zhang, Yidan Ouyang, Shuai Sun, Wen Biao Jiao, Fang Lv, Bogu DuMeizhong Luo, Carlos Ernesto Maldonado, Jose Luis Goicoechea, Lizhong Xiong, Changyin Wu, Yongzhong Xing, Dao Xiu Zhou, Sibin Yu, Yu Zhao, Gongwei Wang, Yeisoo Yu, Yijie Luo, Zhi Wei Zhou, Beatriz Elena Padilla Hurtado, Ann Danowitz, Rod A. Wing, Qifa Zhang

Research output: Contribution to journalArticle

85 Scopus citations

Abstract

Asian cultivated rice consists of two subspecies: Oryza sativa subsp. indica and O. sativa subsp. japonica. Despite the fact that indica rice accounts for over 70% of total rice production worldwide and is genetically much more diverse, a high-quality reference genome for indica rice has yet to be published. We conducted map-based sequencing of two indica rice lines, Zhenshan 97 (ZS97) and Minghui 63(MH63), which represent the two major varietal groups of the indica subspecies and are the parents of an elite Chinese hybrid. The genome sequences were assembled into 237 (ZS97) and 181 (MH63) contigs, with an accuracy >99.99%, and covered 90.6% and 93.2% of their estimated genome sizes. Comparative analyses of these two indica genomes uncovered surprising structural differences, especially with respect to inversions, translocations, presence/absence variations, and segmental duplications. Approximately 42% of nontransposable element related genes were identical between the two genomes. Transcriptome analysis of three tissues showed that 1,059-2,217 more genes were expressed in the hybrid than in the parents and that the expressed genes in the hybrid were much more diverse due to their divergence between the parental genomes. The public availability of two high-quality reference genomes for the indica subspecies of rice will have large-ranging implications for plant biology and crop genetic improvement.

Original languageEnglish (US)
Pages (from-to)E5163-E5171
JournalProceedings of the National Academy of Sciences of the United States of America
Volume113
Issue number35
DOIs
StatePublished - Aug 30 2016

Keywords

  • Bac-by-bac strategy
  • Oryza sativa
  • Reference genomes
  • Transcriptome

ASJC Scopus subject areas

  • General

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