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Flowering response of vernalized WT and nia1nia2 plants submitted to one 22-h LD. Plants were grown in 8-h SDs / 50 μmol.m-2.s-1, then subjected to the LD treatment or not (SD-controls). On soil, WT and nia1nia2 plants were exposed to the LD when 8- and 10-week old, respectively. In hydroponics, plants were 6- and 8-week old, respectively.