Glycosyltransferase involved in the biosynthesis of pectic type-II arabinogalactans. Glycan metabolism; pectin biosynthesis. Widely expressed with the highest expression in reproductive tissues and roots. Homozygote mutants are non viable. Heterozygote mutants display affected pollen germination. Overexpression of PAGR positively affects the biosynthesis of type-II arabinogalactans. Belongs to the glycosyltransferase GT106 family.