Receptor-like kinase that plays important roles in restricting the number of cells entering into male and female sporogenesis. Involved in cell specification during anther development and initiation of anther wall formation. ATP + L-seryl-[protein] = ADP + H(+) + O-phospho-L-seryl-[protein] ATP + L-threonyl-[protein] = ADP + H(+) + O-phospho-L-threonyl-[protein] Interacts with TDL1A. Expressed in anthers and ovules during meiosis. Male-sterile phenotype due to the absence of tapetum. Presence of extra microsporocytes in the developing anthers and ovules. Belongs to the protein kinase superfamily. Ser/Thr protein kinase family.