Abstract
Genotypes of Brassica napus and B. campestris were assessed for time to first flower in photoperiods from 12 to 20 h. The minimum optimum photoperiod (MOP), basic vegetative period (BVP) and photoperiod sensitivity ( b 1 ), were determined. All genotypes reacted as quantitative long day plants. Early flowering of B. campestris relative to B. napus was due to short BVP and low b 1 . Early flowering genotypes within B. napus also had reduced BVP and b 1 . Selection for early flowering could be accomplished by estimating BVP and b 1 with rapeseed grown at 14 and 20-h photoperiods.
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