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By the observation of chloroplast ultrastructure in different period of bract colors of Euphorbia pulcherrima, the paper studied the change of chloroplast ultrastructural in the transition process of bract colors, identified the relationship between E.pulcherrima color change and the chloroplast ultrastructure to provide theorical bases for the cultivation management and further study of E. pulcherrima. Ultrastructural study showed that in the process of change from green to red, the chloroplast of bracts disintegrated gradually, lamellar structure was destroyed gradually, and the content of chloroplasts in mesophyll cells was also reduced gradually. When bracts color resumed to turn green gradually, the content of chloroplasts in mesophyll cells was also increased gradually.
By the observation of chloroplast ultrastructure in different period of bract colors of Euphorbia pulcherrima, the paper studied the change of chloroplast ultrastructural in the transition process of bract colors, identified the relationship between E. pulcherrima color change and the chloroplast ultrastructure to provide theorical bases for the cultivation and further study of E. pulcherrima. Ultrastructural study showed that in the process of change from green to red, the chloroplast of bras disintegrated gradually, lamellar structure was destroyed gradually, and the content of chloroplasts in mesophyll cells was also increased When bracts color resumed to turn green gradually, the content of chloroplasts in mesophyll cells was also increased gradually.