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Title:: Change Law of Bracts Color of Different Bougainvillea spectabilis Cultivars

Author(s):: ZENG Ying1; 2; SHAN Jinfeng1; 2; ZHU Zunling1; 2; 3; WU Xiangchong4; YUAN Ting4; (1.Co-Innovation Center for Sustainable Forestry in Southern China,Nanjing Forestry University,Nanjing,Jiangsu 210037；2.College of Landscape Architecture,Nanjing Forestry University,Nanjing,Jiangsu 210037；3.College of Arts & Design,Nanjing Forestry University,Nanjing,Jiangsu 210037；4.Sanya Daxing New Landscape Ecological Co.Ltd.,Sanya,Hainan 572022)

Keywords:: Bougainvillea spectabilis; bracts color; CIELCH color space; cluster analysis

Abstract:: With 72 Bougainvillea spectabilis cultivars as the research object，its bracts color at budding stage(S1),blooming stage(S2)and end flowering stage(S3)were measured using 3nh spectrophotometer.The dynamic distribution of bracts color in the different flowering phase were studied,and to provide reference for the color classification and breeding of Bougainvillea spectabilis bracts.The results showed that based on the color parameter L*,C*,h°,CIELCH color spatial distribution and frequency distribution of different flowering process were built,it was found that the L* values of most cultivars increased continually whereas C* values decreased.In the h° dimension,the cultivars of low angle of tonal ratio increased gradually,the cultivars of high angle of tonal ratio first decreased after increased.Based on the color parameter L*,a*,b* of the blooming stage,the tree diagram of the bracts color cluster analysis was built.It could be found that on the level of genetic distance 18,72 Bougainvillea spectabilis cultivars could be divided into three color series and six color subseries,namely orange series (including orange red and orange yellow),pink series (including light pink,pink and pink purple),white series (including pink white and white).Based on the results of stability analysis,found that the B2-1 pink red subseries had stronger color stability,continually maintaining a high brightness and saturation,which had high ornamental value.