The numerical classification and grading standards of daylily (Hemerocallis) flower color

• DOI: 10.1371/journal.pone.0216460
• Publication Date: 2019-06-06T17:31:00Z
• Authors: Huliang Cui; Yanan Zhang; Xiaolu Shi; Feifei Gong; Xiong Xiong; Xiuping Kang; Guoming Xing; Sen Li
• Keywords: Sepal; Petal; Color difference

This study collected 183 Hemerocallis varieties to conduct numerical classification of flower color and provide valuable baseline data foundational theory for normalization precision Hemerocallis. The CIELab phenotypes were via colorimeter (CR-10 Plus), which separately measured three sepal petal parts (throat, eye limb). colors experimental samples artificially named by the Royal Horticultural Society Colour Chart (RHSCC). All analyzed using R software. results showed that throat was predominantly green-yellow, light yellow yellow; green-yellow accounted largest proportion sepals (67.76%) petals (69.40%). more abundant, there significant differences between petals. limb clustered into five groups (orange, yellow, pink, red purple); group had most both petals, containing 57.38% 55.74%, respectively. Both (p<0.0001) in (△E), redness (a*) angle (h) throat, limb. However, difference not significant. According "Dual Classification", standard proposed as a 3-level standard. consistency served first standard, second pattern types pure, gradual change, watermark spot, third It has been all divided two categories, finally four types. provides basis reference numeric standardized phenotype description