红光与远红光比值对温室切花菊花‘神马’花芽分化进程的影响

Effects of red and far-red light ratio on the flower bud differentiation of greenhouse cut chrysanthemum cultivar ‘Jingba’

以切花菊品种‘神马’(Chrysanthemum morifoliumcv.‘Jingba’)为试材,设计红光(R:660±10nm)与远红光(FR:730±10nm)比值(R/FR)为0.5、2.5、4.5、6.5的LED照光处理,研究不同R/FR处理对菊花花芽分化进程、相对发育速率及花径的影响。结果表明:R/FR=6.5处理的菊花完成花芽分化进程所需时间最短,比R/FR=0.5处理下的菊花缩短了34d。R/FR越大,菊花花芽分化的相对发育速率越大,完成花芽分化时,R/FR=6.5相对发育速率为R/FR=0.5的2倍。与花芽分化趋势一致,不同光质处理下的花径由大到小的R/FR顺序为:6.5>4.5>2.5>0.5。本研究表明,R/FR=6.5能够显著促进菊花花芽分化进程和花径的生长。

An experiment with LED light source irradiation of 4 ratios （0.5, 2.5, 4.5, and 6.5） of red light （R： 660＋10 nm） to far-red light （FR： 730＋10 nm） was conducted to study the effects of red/far red light ratio （R/FR） on the flower bud differentiation, relative growth rate, and inflorescence diameter of Chrysanthemum morifolium cv. ＇Jingba＇ In treatment R/FR = 6.5, the duration needed by the ＇Jingba＇ to complete its flower bud differentiation was the shortest, being shortened by 34 days as compared to treatment R/FR = 0.5. The larger the R/FR, the higher the relative growth rate for the flower bud differentiation would be. When the flower bud differentiation completed, the relative growth rate in treatment R/FR = 6.5 was as twice as that in treatment R/FR = 0.5. Similar to the flower bud differentiation, the dimension of inflorescence diameter was in the order of treatment R/FR 6.5 〉 R/FR 4. 5 〉 R/FR 2.5 〉 R/FR 0.5. This study indicated that the R/FR ratio of 6.5 could promote the chrysanthemum flower bud differentiation and the inflorescence diameter growth significantly.