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Calcineurin B-like protein-interacting protein kinases ( CIPKs ) play essential roles in plant abiotic stress response. In order to better understand salt tolerance, we cloned and analyzed the  NtCIPK9  gene from the halophyte  Nitraria tangutorum . Phylogenetic analysis shows that  NtCIPK9  belongs to a sister clade with the  Arabidopsis AtCIPK9  gene and is thought to localize to the plasma membrane.  NtCIPK9  shows the highest expression level in the  Nitraria tangutorum  root under normal growth conditions, whereas after NaCl treatment, the highest expression was found in the blade.  NtCIPK9 -overexpressing Arabidopsis plants have a higher seed germination rate, longer root length, and displayed higher salt tolerance than wild type seedlings under salt stress conditions. Furthermore,  NtCIPK9  overexpression might enhance the expression of genes related to K +  transportation after NaCl treatment. Thus, we conclude that  NtCIPK9  increases transgenic plant salt tolerance and reduces damage associated with salt stress by promoting the expression of genes controlling ion homeostasis. Our results suggest that  NtCIPK9  could serve as an ideal candidate gene to genetically engineer salt-tolerant plants.

NtCIPK9: A Calcineurin B-Like Protein-Interacting Protein Kinase From the Halophyte Nitraria tangutorum, Enhances Arabidopsis Salt Tolerance