Probable phosphoinositide phosphatase that could be involved in stress signaling. A number of isoforms are produced. According to EST sequences. Ubiquitous. Most abundant in the roots with lower expression levels throughout the leaves and shoot. The phosphatase catalytic core motif (or RXNCXDCLDRTN motif) from the SAC domain is found in metal-independent protein phosphatases and inositol polyphosphate phosphatases. Characteristics of a constitutive stress response, including dwarfism, closed stomata, and accumulation of anthocyanin and reactive-oxygen species. Accumulates elevated levels of PtdIns(4,5)P(2) and Ins(1,4,5)P(3) in roots. Hypersensitivity to salt stress. Late flowering, shorter roots with less lateral branching and low fertility. Abnormalities of cell wall and membrane structures in primary root cells.