Phytochromes are involved in floral induction Photoperiod Sd LD Light break(15 min)in dark SDP Cocklebur (Xanthium) LDP Henbane LD SD Red light is most effective in promoting LdF flowering and preventing short day plant from floweringPhytochromes are involved in floral induction Photoperiod SDP Cocklebur (Xanthium) LDP Henbane SD LD Light break (15 min) in dark SD LD Red light is most effective in promoting LDF flowering and preventing short day plant from flowering