Preliminary Study on the Characteristics of the Photosynthetic Pigment and Chlorophyll Biological Synthesis in Chlorophytum comosum

[Objective] The research aimed to explore the physiological mechanism of the leaf color variation in Chlorophytum comosum.[Method] The contents of photosynthetic pigments and the intermediate products which were related to the chlorophyll synthesis pathway were analyzed using the plants of C.comosum var.marginata and C.comosum var.mediopictum as materials.[Result] Compared with the normal green parts,the contents of chlorophyll a,b and carotenoid decreased gradually in the etiolation parts,especially the contents of chlorophyll a.And in the etiolation parts,the accumulation of Mg-protoporphyrin Ⅸ and Pchlide a decreased obviously,while the others of intermediate products increased in C.comosum,var.marginata or less differences in C.comosum,var.mediopictum.[Conclusion] The obvious decrease of chlorophyll a might directly result in the etiolation,and the reduction of chlorophyll synthesis was due to a metabolic block from coproporphyrinogen Ⅲ to Mg-protoporphyrin Ⅸ synthesis pathway.