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SELF PRUNING 3C is a flowering repressor that modulates seed germination, root architecture and drought responses

Allelic variation in the CETS (CENTRORADIALIS, TERMINAL FLOWER 1, SELF PRUNING) gene family has been shown to control agronomically important traits in many crops. CETS genes encode phosphatidylethanolamine binding proteins (PEBPs) that have a central role in flowering time control as florigenic and anti-florigenic signals. The great expansion of CETS genes in many species suggests that the functions of this family go beyond flowering. Here, we characterize the tomato SELF PRUNING 3C (SP3C) gene, and show that besides acting as a flowering repressor it also regulates seed germination and modulates root architecture. We show that loss of SP3C function in CRISPR/Cas9-generated mutant lines accelerates seed germination and increases root length with lower root side branching. Higher SP3C expression in transgenic lines promotes the opposite effects and also improves tolerance to water stress in seedlings. These discoveries provide insights into the role of SP paralogs in agronomically relevant traits and support future exploration of the involvement of CETS genes in abiotic stress responses. Highlight The SELF PRUNING 3C (SP3C) gene is a repressor of flowering in tomato and exhibits additional functions, acting as a repressor of seed germination and modulating root architecture.