PNAS：首都师范大学何奕騉课题组揭示植物基因组中的耐脱水性的

摘要 : 基因组分析展示了植物的脱水耐性的重要进步，同时区域内比预期更多的水资源,将对当地的许多植物生物学领域和农业产生深远的影响。


基因组分析展示了植物的脱水耐性的重要进步，同时区域内比预期更多的水资源,将对当地的许多植物生物学领域和农业产生深远的影响。我们研究了1.6GB的旋蒴苣苔基因组，这是一种重要的模式植物有利于我们了解植物的脱水耐性。研究发现，一种称为旋蒴苣苔(Boea hygrometrica)的叶片与根完全脱水也能生存的植物的基因组草图，揭示出了该物种独有的大量基因，它们在脱水期间转录，还揭示出了5S rRNA的基因的扩张可能让植物在再水化期间迅速合成蛋白质，而ELIP族基因的扩张可能在脱水期间保护光合作用机制免受损伤。

原文链接：

The resurrection genome of Boea hygrometrica: A blueprint for survival of dehydration

原文摘要：

“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.

doi: 10.1073/PNAS.1505811112

作者：西瓜

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