Xiao Lihong, Yang Ge, Zhang Liechi, Yang Xinhua, Zhao Shuang, Ji Zhongzhong, Zhou Qing, Hu Min, Wang Yu, Chen Ming, Xu Yu, Jin Haijing, Xiao Xuan, Hu Guipeng, Bao Fang, Hu Yong, Wan Ping, Li Legong, Deng Xin, Kuang Tingyun, Xiang Chengbin, Zhu Jian-Kang, Oliver Melvin J, He Yikun
School of Life Sciences, Capital Normal University, Beijing 100048, China;
Beijing Genomics Institute-Shenzhen, Shenzhen 518083, China;
Proc Natl Acad Sci U S A. 2015 May 5;112(18):5833-7. doi: 10.1073/pnas.1505811112. Epub 2015 Apr 20.
"Drying without dying" is an essential trait in land plant evolution. Unraveling how a unique group of angiosperms, the Resurrection Plants, survive desiccation of their leaves and roots has been hampered by the lack of a foundational genome perspective. Here we report the ∼1,691-Mb sequenced genome of Boea hygrometrica, an important resurrection plant model. The sequence revealed evidence for two historical genome-wide duplication events, a compliment of 49,374 protein-coding genes, 29.15% of which are unique (orphan) to Boea and 20% of which (9,888) significantly respond to desiccation at the transcript level. Expansion of early light-inducible protein (ELIP) and 5S rRNA genes highlights the importance of the protection of the photosynthetic apparatus during drying and the rapid resumption of protein synthesis in the resurrection capability of Boea. Transcriptome analysis reveals extensive alternative splicing of transcripts and a focus on cellular protection strategies. The lack of desiccation tolerance-specific genome organizational features suggests the resurrection phenotype evolved mainly by an alteration in the control of dehydration response genes.
“干而不死”是陆地植物进化中的一个基本特征。由于缺乏基础基因组视角,揭示一类独特的被子植物——复苏植物如何在叶片和根部脱水的情况下存活一直受到阻碍。在此,我们报告了重要的复苏植物模式物种——卷柏的约16.91亿碱基对的测序基因组。该序列显示出两次全基因组复制事件的证据,共有49374个蛋白质编码基因,其中29.15%是卷柏特有的(孤儿基因),20%(9888个)在转录水平上对脱水有显著响应。早期光诱导蛋白(ELIP)和5S rRNA基因的扩增突出了在干燥过程中保护光合机构以及卷柏复苏能力中蛋白质合成快速恢复的重要性。转录组分析揭示了转录本的广泛可变剪接以及对细胞保护策略的关注。缺乏耐脱水特异性的基因组组织特征表明,复苏表型主要是通过脱水反应基因控制的改变而进化的。