SMZ/SNZ and Gibberellin signaling are required for nitrate - elicited delay of flowering time in Arabidopsis thaliana

GRAS DE; VIDAL EA; UNDURRAGA SF; ALABADI D; BLÁZQUEZ M; GUTIÉRREZ RA

Congreso; XI Reunion de Biologia Vegetal Chile; 2016

Reproductive success of plantslargely depends on the correct programming of developmental phase transitions, particularlythe shift from vegetative to reproductive growth. The timing of this transitionis finely regulated by the integration of an array of environmental andendogenous factors. Nitrogen (N) is the mineral macronutrient plants require inthe largest amount.Therefore, its availability greatly impacts many aspects ofplant growth and development, including flowering time. We found nitratesignaling interacts with the age-related and gibberellic acid pathways tocontrol flowering time in Arabidopsis thaliana. We show repressorsof floweringtime belonging to the AP2-type transcription factor family including SCHLAFMUTZE(SMZ)and SCHNARCHZAPFEN(SNZ) are important regulators of flowering time in responseto nitrate. Our results support a model where nitrate activates SMZ and SNZ viathe gibberellin pathway to repress flowering time in Arabidopsis thaliana.