Regulation Of GA₃ And PP₃₃₃ Under Red And Blue Light On Dianthus Chinensis Var.chinensis Cv.‘Corona’ Florescence

Dianthus chinensis var.chinensis cv.‘Corona’is a herbaceous flower belonged to Dianthus family and Dianthus genus with high ornamental value,which flowers bloom mainly in April and in May.At present,the regulation methods of dianthus florescence were limited to single-factor light temperature regulation and hormone regulation.Studies have shown that light quality had a good regulating effect on flowering time of dianthus.So on this basis,this study aimed to explore the effect of interactive regulating of light quality and hormone on D.chinensis florescence regulation.In this experiment,the plants were treated by spraying gibberellins acid（100,300,500mg/L）and paclobutrazol（600,800,1000mg/L）under red light and blue light.By studying flowering traits and physiological characteristics,this paper provided a certain theoretical basis for the regulation of D.chinensis florescence.The main results are as follows:1.The effects of GA₃and PP₃₃₃combined with light quality treatment on the florescence had certain differences.Among them,GA₃300mg/L×blue light florescence is 10 days longer than the control.PP₃₃₃1000mg/L×blue light florescence is delayed by11 days,and the florescence is 7 days longer than the control.PP₃₃₃1000mg/L×red light flower path is largest.PP₃₃₃600mg/L×red light has the highest flower formation rate.2.GA₃and PP₃₃₃can promote the photosynthetic pigment content in leaves under red and blue light.The content of chlorophyll a treated with GA₃300mg/L×blue light and PP₃₃₃1000mg/L×bluelightwererelativelyhigher.GA₃300mg/L×red light,PP₃₃₃800mg/L×red light and PP₃₃₃1000mg/L×blue light chlorophyll b content were relatively higher.GA₃300mg/L×blue light and PP₃₃₃1000mg/L×red light carotenoid content were relatively higher.It is indicated that plant growth regulators,light quality and their interactions on plants play a certain role in photosynthesis promoting.3.Plants need to consume a lot of energy during flowering time.GA₃and PP₃₃₃could effectively promote the formation of plant photosynthetic products and promote the accumulation of soluble sugar and soluble protein content,and can slow down the plant oxidation process to varying degrees.The differences between the treatment groups were significant.The treatment effects of GA₃300mg/L×red light,PP₃₃₃800mg/L×red light,GA₃300mg/L×blue light,PP₃₃₃800mg/L×blue light and PP₃₃₃1000mg/L×blue light were better than other treatment groups.4.GA₃500mg/L×red light had a weaker effect on plant flowering time than GA₃300mg/L×red light.GA₃500mg/L×blue light also had weaker control effect on plant flowering time than GA₃300mg/L×blue light,which the difference is significant.The results indicated that high concentration of GA₃and blue or red conditions had a certain antagonistic effect on dianthus.