Seedlings were treated with different daylengths and with different numbers of photoperiods . the results showed that treatments with short day - lengths promoted its flowering and the critical daylength is 15h 不同日照长度处理:对毕氏海蓬子植株分别施以每天光照6h ? 16h ,间隔为1h的不同日照长度处理,从而确定其临界日长; 2