Abstract: During the development of buckwheat(Fagopyrum esculentum Moench.) embryo, the aggregate rough endoplasmic reticula(rER) that are bundles or rings rER are observed in the cotyledon cells. We don't think that the appearance of the aggregate rER is the reaction of cotyledon cell to stress condition. Usually, there are some protein lumps beside the aggregate rER. These lumps are not formed in vacuoles or dilated vesicles of rER because they are irregular in shape and not surrounded by membrane. These observations indicate that the aggregate rER can synthesize and transport protein into cytoplasm and accumulate in cytoplasm. Obviously, the efficiency of accumulating storage protein by this way is higher than that of single-stranded rER.

Key words: Fagopyrum esculentum, cotyledon, rER, protein