Probable 3'->5' exoribonuclease involved in the regulation of cuticular wax biosynthesis by controlling the expression of CER3. May act by degrading a specific mRNA species encoding a negative regulator of CER3 transcription. Can perform exosomal functions and complement the yeast rrp45 null mutant. Excluded from the nucleolus. Bright green glossy stems and siliques due to reduced cuticular wax accumulation. Belongs to the RNase PH family.