Regulates proliferation. Induces whole plant regeneration when expressed in heterologous systems (PubMed:26191065, PubMed:26237533). Involved in root growth and lateral root development, with a probable role in cell reprogramming (PubMed:25566280). The long-distance transport of TCTP RNA and/or protein in plants may have an important role in regulation of growth and development (Probable). Expressed in stems, cauline leaves, minor veins of rosette leaves, roots, lateral root primordia, vascular tissues of petioles and inflorescences, base of siliques, papillae and ovules. Not detected in root meristems, anthers or seeds (PubMed:26191065). Expressed in stomata, trichomes and root cortex (PubMed:26191065, PubMed:26237533). Seedling lethality at the early rosette stage when homozygous. In a heterologous system, TCTP2 mRNA and protein are capable of moving long distance in both directions with a tendency for movment from source to sink tissue (PubMed:25566280, PubMed:26237533). In heterografts, the long-distance transport of TCTP2 is necessary but not sufficient to induce emergence of adventitious aerial roots in close proximity to the graft (PubMed:26237533). Belongs to the TCTP family. Was initially thought to be a pseudogene.