Impact Factor:5.578

Journal:Scientific Reports

Abstract:Gossypium hirsutum contributes the most production of cotton fibre, but G. barbadense is valued for its better comprehensive resistance and superior fibre properties. However, the allotetraploid genome of G. barbadense has not been comprehensively analysed. Here we present a high-quality assembly of the 2.57 gigabase genome of G. barbadense, including 80,876 protein-coding genes. The double-sized genome of the A (or At) (1.50 Gb) against D (or Dt) (853 Mb) primarily resulted from the expansion of Gypsy elements, including Peabody and Retrosat2 subclades in the Del clade and the Athila subclade in the Athila/Tat clade. Substantial gene expansion and contraction were observed and rich homoeologous gene pairs with biased expression patterns were identified, suggesting abundant gene sub-functionalization occurred by allopolyploidization. More specifically, the CesA gene family has adapted differentially temporal expression patterns, suggesting an integrated regulatory mechanism of CesA genes from At and Dt subgenomes for the primary and secondary cellulose biosynthesis of cotton fibre in a “relay race”-like fashion. We anticipate that the G. barbadense genome sequence will advance our understanding the mechanism of genome polyploidization and underpin genome-wide comparison research in this genus.

First Author:Daojun Yuan, Zhonghui Tang, Maojun Wang, Wenhui Gao, Lili Tu, Xin Jin, Lingling Chen, Yonghui He, Lin Zhang, Longfu Zhu, Yang Li, Qiqi Liang, Zhongxu Lin, Xiyan Yang, Nian Liu, Shuangxia Jin, Yang Lei, Yuanhao Ding, Guoliang Li, Xiaoan Ruan, Yijun Ruan & Xianlong Zhang

Document Code:17662

Volume:5

Translation or Not:no

Date of Publication:2015-12-01

Included Journals:SCI

Links to published journals:https://www.nature.com/articles/srep17662