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The reproductive success of plants largely depends on the correct programming of developmental phase transitions, particularly the shift from vegetative to

reproductive growth. The timing of this transition is finely regulated by the integration of an array of environmental and endogenous factors. Nitrogen is the

mineral macronutrient that plants require in the largest amount, and as such its availability greatly impacts on many aspects of plant growth and development,

including flowering time. We found that nitrate signaling interacts with the age-related and gibberellic acid pathways to control flowering time in

Arabidopsis thaliana. We revealed that repressors of flowering time belonging to the AP2-type transcription factor family including SCHLAFMUTZE (SMZ) and

SCHNARCHZAPFEN (SNZ) are important regulators of flowering time in response to nitrate. Our results support a model whereby nitrate activates SMZ and SNZ via

the gibberellin pathway to repress flowering time in Arabidopsis thaliana.