Shows phosphatase activity, hydrolyzing the artificial substrate para-nitrophenylphosphate (pNPP) in vitro. Binds 2 manganese ions per subunit. A number of isoforms are produced. According to EST sequences. Expressed in rosettes leaves, shoots and flowers (at protein level). Circadian-regulated, with a peak in expression at 8 hours light time on a 12 hours light/dark cycle (at protein level) (PubMed:21976480). Induced by heat shock. Down-regulated by infection with the bacterial pathogen P.syringae (Probable). No visible phenotype under normal growth conditions. Belongs to the metallophosphoesterase superfamily. SLP family.