Probable cyclin-dependent protein kinase (CDK) inhibitor that functions as a repressor of mitosis in the endoreduplication cell cycle. May coordinate biotic and abiotic stress perception and cell cycle progression. Inhibits CDKs activity in vitro. Interacts with CDKA-1 and CYCD5-3. By cold, drought, propionic acid, chitin oligosaccharide elicitor and flagellin of P.avenae.