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Plants respond to environmental cues, such as light and temperature, which regulate their growth and development. In the model plant Arabidopsis (Arabidopsis thaliana), PHYTOCHROME-INTERACTING FACTORS (PIFs) are central regulators of both shade-avoidance and thermomorphogenesis. However, their functional roles in crop species are less well known. Here, we generated a tomato (Solanum lycopersicum) mutant lacking all eight known PIF genes (slpifo), to investigate their roles under controlled and...