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        Heterologous overexpression of the Arabidopsis SnRK2.8 gene enhances drought and salt tolerance in Populus × euramericana cv ‘Nanlin895’

        Hui Wei,Ali Movahedi,Chen Xu,Pu Wang,Weibo Sun,Tongming Yin,Qiang Zhuge 한국식물생명공학회 2019 Plant biotechnology reports Vol.13 No.3

        The SnRK (sucrose non-fermenting-1 related protein kinase) families respond to salt tolerance, nutritional stress, disease stress, and carbon metabolic regulation. In this study, the SnRK2.8 gene was cloned from Arabidopsis thaliana and nominated AtSnRK2.8. Bioinformatics characterization of AtSnRK2.8 showed that it contained an ATP binding site and a serine/ threonine protein kinase binding site at the N-terminal catalytic domain. In addition, the AtSnRK2.8 protein contained special domain I at the C-terminal catalytic domain. Real-time polymerase chain reaction (PCR) results showed that the AtSnRK2.8 gene was expressed in all tested tissues and was highly expressed in seeds. Our analyses proved that the AtSnRK2.8 gene expression was upregulated by salt and drought stresses. The recombinant AtSnRK2.8 protein was expressed using a pET-28a system and purified with HisTrap HP affinity columns. The recombinant AtSnRK2.8 protein has the properties of a protein kinase. The results of overexpressing AtSnRK2.8 in Nanlin895 poplar showed that the transgenic poplar plants had a better ability to resist drought and salt stress compared to the wild type, and adapted well to drought and a high-salt environment.

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