Kinase involved in the activation and reutilization of phytol from chlorophyll degradation in plant metabolism, including tocopherol biosynthesis. Catalyzes the conversion of phytol to phytol monophosphate (PMP) in the presence of CTP or UTP. No activity with ATP or GTP as phosphoryl donor. CTP + phytol = CDP + H(+) + phytyl phosphate Cofactor biosynthesis; tocopherol biosynthesis. Highly expressed early in seed development and in 6-week-old senescent leaves. 50% reduction in tocopherol content in leaves. Plants able to grow on soil and to produce fertile seeds. Vte5 and vte6 double mutants can grow photoautotrophically and show a stay-green phenotype with strongly delayed senescence and extended lifetime. Belongs to the polyprenol kinase family.