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Plant Snf1 (sucrose non-fermenting-1) related protein kinase (SnRK), a subfamily of serine/threonine kinases, has been implicated as a crucial upstream regulator of ABA and osmotic signaling as in many other signaling cascades. In this paper, we have isolated a novel plant specific ABA activated calcium independent protein kinase ( GsAPK ) from a highly salt tolerant plant,  Glycine soja  (50109), which is a member of the SnRK2 family. Subcellular localization studies using GFP fusion protein indicated that  GsAPK  is localized in the plasma membrane. We found that autophosphorylation and Myelin Basis Protein phosphorylation activity of GsAPK is only activated by ABA and the kinase activity also was observed when calcium was replaced by EGTA, suggesting its independence of calcium in enzyme activity. We also found that cold, salinity, drought, and ABA stress alter  GsAPK  gene transcripts and heterogonous overexpression of  GsAPK  in  Arabidopsis  alters plant tolerance to high salinity and ABA stress. In summary, we demonstrated that  GsAPK  is a  Glycine soja  ABA activated calcium independent SnRK-type kinase presumably involved in ABA mediated stress signal transduction.

GsAPK, an ABA-Activated and Calcium-Independent SnRK2-Type Kinase from G. soja, Mediates the Regulation of Plant Tolerance to Salinity and ABA Stress