Negatively regulates meristematic tissue proliferation by integrating developmental signals with carbon source availability (PubMed:21185286). May act as the scaffold of a protein complex, which sequesters key factors that are required for the G2 to M transition in meristematic tissues (PubMed:21185286). Together with REC2, REC3 and FMT/CLU, contributes to the establishment of the cellular volume devoted to the chloroplast compartment (PubMed:26862170). Expressed in the non-epidermal tissues of the true leaves (PubMed:21185286). Not detected in the vegetative shoot meristem and leaf primordia (PubMed:21185286). Down-regulated by sucrose. No visible phenotype (PubMed:21185286). Reduced proportion of the cellular volume devoted to chloroplasts leading to an abnormal chloroplasts distributions (PubMed:26862170). Lower levels of chlorophyll, especially in plants lacking REC1, REC2, REC3 and FMT/CLU (PubMed:26862170). The sucrose repression of TSS is a response specific to the rescue of stip mutants, and the presence of STIP in the wild-type may be sufficient to repress TSS expression even under sugar deprivation.