Changes of Leaf Color and Dynamics of Pigment Components in Ornamental Crabapple

Taking 119 ornamental crabapple varieties as experimental materials,and their leaf color parameters（color brightness L^*,color saturation C^*,hue angle h°）were measured by color difference meter from July to September.The dynamic changes of leaf color of ornamental crabapple varieties in CIELCH color space were analyzed,and the leaf color changes and change rules among different varieties were studied,providing theoretical reference for excellent breeding work.The pigment components（anthocyanidin Anth,carotenoid Car and chlorophyll Chl） were determined by spectrometer,and the relationship and dynamic rule of pigment components among different leaf positions of ornamental crabapple varieties were studied,which provided theoretical reference for the selection of fine leaf-observing germplasm and the improvement of leaf color of ornamental crabapple The results showed that from July to September,the varieties of Begonia showed regular changes in the dimension direction of color parameter L^*,C^*,h°,with the over all performance being the most concentrated in July and the partial dispersion in September.The L^*and C^*of most varieties showed an upward trend,and showed an overall upward trend in the direction of chromaticity angle h°,and were mostly at about 90°,distributed in the yellow area of h°.From July to September,chlorophyll accounts for the highest proportion of anthocyanin,carotenoid and chlorophyll,while the proportion of anthocyanin and carotenoid were relatively low.Therefore,chlorophyll mainly determines the color tone of begonia leaves,and the content of anthocyanin and carotenoid increases the diversity of leaf colors.