Regulates flowering time by modulating the photoperiod pathway. Phosphorylates the vacuolar ATPase subunit C (VATC) and RGS1 (PubMed:16427632, PubMed:18761494). Regulates EDM2 that, in turn, modulates development processes (PubMed:20840782, PubMed:20149132). ATP + L-seryl-[protein] = ADP + H(+) + O-phospho-L-seryl-[protein] ATP + L-threonyl-[protein] = ADP + H(+) + O-phospho-L-threonyl-[protein] Interacts with RGS1 and GB1, but not with GPA1. The association with RGS1 at the plasma membrane is triggered by induction of glucose (PubMed:21952135, PubMed:22940907). Binds to EDM2 in nucleus (PubMed:20149132). Autophosphorylated. Plants display early flowering and altered expression of genes involved in the photoperiod flowering pathway, such as ELF4, TOC1, CO and FT. Belongs to the protein kinase superfamily. Ser/Thr protein kinase family. WNK subfamily. Was named WNK/'with no lysine(K)' because key residues for catalysis, including the lysine involved in ATP binding, are either not conserved or differ compared to the residues described in other kinase family proteins.