アオキ果実の成熟に伴う果皮の色素および色素体微細構造の変化
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The correlative change of pigments with chromoplast morphogenesis in the pericarp of Aucuba fruits was examined by a pigment spectrophotometry and an electron microscopy. As ripening proceeded, chlorophyll contents were decreased gradually, with an exception of a little increase at the red-ripe stage. On the other hand, newly synthesized carotenoids, probably chloroxanthin and/or its homologues were detected from the pericarp of orange-colored and red-ripe fruits. The histological observation of pericarps with naked eyes and a light microscope demonstrated that the red color of whole fruits was reflected by the color of epidermis and two or three cell layers located beneath the epidermis. Since the red color was observed even in the central vacuole of those cells, it seemed that the color might be due to some anthocyan pigments, such as an aucubin. Plastid metamorphosis was observed in relationship to the alternation of pigments in pericarps. In the pericarp of green fruits, the plastids had well developed grana and intergrana thylakoids, as found in the chloroplasts of green leaves. As ripening proceeded, in plastids, plastoglobuli increased in both number and size, in contrast with the degradation of grana-stack and the fragmentation of stromal thylakoids. The plastids of red-ripe fruit pericarps contained exclusively plastoglobuli in various sizes at the center of stroma. These results indicated that the plastids contained in the pericarps of the red-ripe fruit were the G (globular)-type and Y (yellow)-type chromoplasts, and stored newly synthesized carotenoids in the plastoglobuli.
- 神奈川大学総合理学研究所の論文
- 2011-00-00
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