Repair polymerase involved in base excision repair (BER) and responsible for repair of lesions that give rise to abasic (AP) sites in DNA. Has both DNA polymerase and terminal transferase activities. Has a 5'-deoxyribose-5-phosphate lyase (dRP lyase) activity. a 2'-deoxyribonucleoside 5'-triphosphate + DNA(n) = diphosphate + DNA(n+1) Interacts with PCNA. Expressed in proliferating tissues. Expressed in roots, root apex, young leaves, shoot apical meristem (SAM), flag leaves and panicles. By UV treatment and methyl methanesulfonate (MMS). Belongs to the DNA polymerase type-X family.