关键词: 青花菜, 花椰菜, 叶片颜色, 色差仪, 颜色参数

Abstract: The visual assessment of leaf color by the human eye presents inherent challenges and inaccuracies. To explore the feasibility of quantitative and digital definition of leaf color，this study collected and calculated leaf color parameters（L^*，a^*，b^*，C^*，H^* and E^*）from 56 broccoli（Brassica oleracea var. italica）germplasm resources and 74 cauliflower（Brassica oleracea var. botrytis）germplasm resources by using the colorimeter. These six parameters with leaf color-related traits of broccoli and cauliflower were further investigated. The results showed that the values of the color parameters measured by the colorimeter could effectively reflect the difference between blue-green，green，and gray-green of broccoli leaves and the intensity of cauliflower leaf colors. The values of the color parameters a^* and b^* were essential for identifying broccoli and cauliflower leaf colors. In addition，cuticular waxes on leaf surface also affect the identification of leaf color. The more cuticular waxes resulted in a smaller b^* value，corresponding to the more blue-green leaf color. Moreover，the L^* value could be used to distinguish leaf between broccoli and cauliflower. This study suggests the color parameters measured by the colorimeter can reflect the relevant characteristics of broccoli and cauliflower leaf color，which could avoid the subjectivity and inaccuracy of the color sensory judgment，providing an important reference for the digital description and quantitative analysis of broccoli and cauliflower leaf color and related traits.

Key words: broccoli, cauliflower, leaf color, colorimeter, color parameters