Genomic insights into salt adaptation in a desert poplar

Tao Ma, Junyi Wang, Gongke Zhou, Zhen Yue, Quanjun Hu, Yan Chen, Bingbing Liu, Qiang Qiu, Zhuo Wang, Jian Zhang, Kun Wang, Dechun Jiang, Caiyun Gou, Lili Yu, Dongliang Zhan, Ran Zhou, Wenchun Luo, Hui Ma, Yongzhi Yang, Shengkai Pan, Dongming Fang, Yadan Luo, Xia Wang, Gaini Wang, Juan Wang, Qian Wang, Xu Lu, Zhe Chen, Jinchao Liu, Yao Lu, Ye Yin, Huanming Yang, Richard J Abbott, Yuxia Wu, Dongshi Wan, Jia Li, Tongming Yin, Martin Lascoux, Stephen P Difazio, Gerald A Tuskan, Jun Wang, Jianquan Liu, Liu Jianquan
Nature Communications 2013, 4: 2797
Despite the high economic and ecological importance of forests, our knowledge of the genomic evolution of trees under salt stress remains very limited. Here we report the genome sequence of the desert poplar, Populus euphratica, which exhibits high tolerance to salt stress. Its genome is very similar and collinear to that of the closely related mesophytic congener, P. trichocarpa. However, we find that several gene families likely to be involved in tolerance to salt stress contain significantly more gene copies within the P. euphratica lineage. Furthermore, genes showing evidence of positive selection are significantly enriched in functional categories related to salt stress. Some of these genes, and others within the same categories, are significantly upregulated under salt stress relative to their expression in another salt-sensitive poplar. Our results provide an important background for understanding tree adaptation to salt stress and facilitating the genetic improvement of cultivated poplars for saline soils.

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