Binds the poly(A) tail of mRNA. Appears to be an important mediator of the multiple roles of the poly(A) tail in mRNA biogenesis, stability and translation (By similarity). Expressed predominantly in roots but also at lower levels in immature flowers. A.thaliana contains 8 PABP genes. Belongs to the polyadenylate-binding protein type-1 family. Lacks the PABC domain, which is one of the conserved features of the PAPB family.