Flower development Induction Signal Competent: Determined xpressed Able to respond in Able to follow same The apical expected manner developmental meristem when given the Photoperiod program even after Hormones undergoes appropriate removal from its morphogenesis developmental normal position sig lant Vegetative growth Flowers A simplified model for floral evocation at the respond to a floral stimulus (induction)by becoming flo shoot apex in which the cells of the vegetative meristem rally determined ( committed to producing a flower). The acquire new developmental fates. To initiate floral develop- determined state is usually expressed, but this may require ment, the cells of the meristem must first become compe- an additional signal (After McDaniel et al. 1992. tent. A competent vegetative meristem is one that canFlower development