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Apex dissection of plants grown under 12 h light. a) 4 weeks after each vernalization treatment. Red bar is 500 μm. b) Apex development over time after different vernalization durations. Solid lines correspond to ‘Hispanic’ and dashed lines to ‘Barberousse’. The size of each dot represent the number of apices (biological replicates) at that Waddington stage. Black dashed horizontal line marks WD2: the double ridge stage, considered as transition from vegetative to reproductive phase
