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This species produces four megaspores of tetrad and the chalazal-most one of them becomes functional. The megasporocyte and the functional cell of dyad and tetrad have some polarity between the chalazal and the micropylar poles; the organelles enclosed with a double membrane and the concentric ER are not distributed uniformly in the cytoplasm of these cells. In particular, the concentric ER appears in the nonvacuolate cytoplasm of the megasporocyte, two dyad cells and four tetrad cells, but it disappears in the vacuolate cytoplasm of these cells. The nucellus of this species is tenuinucellate; the mega-sporocyte is situated at the top of nucellar column which is invested with a layer of the epidermal cells. The chalazal part of the megasporocyte, the dyad and the tetrad is invested with the cells of nucellar column, while the micropylar part of them is invested with the cells of nucellar epidermis. Only at the chalazal part, there are plasmodesmata, but at the micropylar part there are not plasmodesmata. It has been discussed that the unequal distribution of the plasmodesmata correlates with the mode of the megaspore formation such as the monosporic, bisporic and tetrasporic type of development (Kapil \u0026 Bhatnagar 1981). 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Electron Microscopic Observation of Megasporogenesis of Tricyrtis hirta
http://hdl.handle.net/10131/3043
http://hdl.handle.net/10131/3043803f41e7-5442-46de-b97c-8583ed379265
名前 / ファイル | ライセンス | アクション |
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KJ00004479095.pdf (4.1 MB)
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Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
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公開日 | 2007-09-27 | |||||
タイトル | ||||||
タイトル | Electron Microscopic Observation of Megasporogenesis of Tricyrtis hirta | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | departmental bulletin paper | |||||
著者 |
Sato, Yoshihiko
× Sato, Yoshihiko× Ando, Hiroyuki |
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著者(ヨミ) | ||||||
識別子Scheme | WEKO | |||||
識別子 | 8587 | |||||
姓名 | サトウ, ヨシヒコ | |||||
著者(ヨミ) | ||||||
識別子Scheme | WEKO | |||||
識別子 | 8588 | |||||
姓名 | アンドウ, ヒロユキ | |||||
著者別名 | ||||||
識別子Scheme | WEKO | |||||
識別子 | 8589 | |||||
姓名 | 佐藤, 嘉彦 | |||||
著者別名 | ||||||
識別子Scheme | WEKO | |||||
識別子 | 8590 | |||||
姓名 | 安藤, 浩之 | |||||
著者所属 | ||||||
Department of Biology, Faculty of Education, Yokohama National University | ||||||
著者所属 | ||||||
Department of Biology, Faculty of Education, Yokohama National University | ||||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | The process of the megaspore formation in Tricyrtis hirta (Liliaceae) was examined electron-microscopically. This species produces four megaspores of tetrad and the chalazal-most one of them becomes functional. The megasporocyte and the functional cell of dyad and tetrad have some polarity between the chalazal and the micropylar poles; the organelles enclosed with a double membrane and the concentric ER are not distributed uniformly in the cytoplasm of these cells. In particular, the concentric ER appears in the nonvacuolate cytoplasm of the megasporocyte, two dyad cells and four tetrad cells, but it disappears in the vacuolate cytoplasm of these cells. The nucellus of this species is tenuinucellate; the mega-sporocyte is situated at the top of nucellar column which is invested with a layer of the epidermal cells. The chalazal part of the megasporocyte, the dyad and the tetrad is invested with the cells of nucellar column, while the micropylar part of them is invested with the cells of nucellar epidermis. Only at the chalazal part, there are plasmodesmata, but at the micropylar part there are not plasmodesmata. It has been discussed that the unequal distribution of the plasmodesmata correlates with the mode of the megaspore formation such as the monosporic, bisporic and tetrasporic type of development (Kapil & Bhatnagar 1981). Besides such a discussion, the correlation between the distribution pattern of plasmodesmata and the kind of the nucellar cells to which the cell or cells at the meiotic stage are contiguous should be discussed as well. | |||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | ユリ科のホトトギス(Tricyrtis hirta)の大胞子形成過程を透過型電子顕微鏡を用いて調査した。この種の大胞子母細胞は減数分裂を行い4個の大胞子を作り,その内の合点端の大胞子(機能的大胞子)1個だけが胚嚢の形成を始める。大胞子母細胞と二分子の合点側細胞,機能的大胞子には,細胞内小器官の分布に極性がみられる。特に,液胞化のほとんど進んでいないこれらの細胞には,同心円状の小胞体(concentric ER)が合点極付近に必ず見られる。ホトトギスの珠心は薄層型(tenuinucellate)であるため,大胞子母細胞や二分子,四分子は珠心表皮細胞とこれ以外の珠心細胞に必ず接している。珠心表皮の細胞は表皮系を構成いる細胞であり,表皮以外の珠心細胞は基本組織系の細胞である。つまり,減数分裂期にある細胞は異なる組織系に属する細胞に接している。原形質連絡は,珠心表皮細胞との境界にはみられず,表皮以外の珠心細胞との境界にはかなりよくみられる。原形質連絡の不均一な分布については,大胞子の形成様式(単胞子性,二胞子性,四胞子性)と関係付けて議論されてきた(Kapil&Bhatnagar 1981)。原形質連絡の分布については,そのような議論に加えて,減数分裂期にある細胞が接する珠心細胞がどの組織系に属するかも考慮する必要があると思われる。本稿に使用したFig.2Aは藤嶺学園藤沢高等学校教諭永井規之君によって撮影されたもので,同君に感謝申し上げます。 | |||||
書誌情報 |
横浜国立大学理科紀要. 第二類, 生物学・地学 巻 38, p. 41-52, 発行日 1991-10-31 |
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ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 05135613 | |||||
書誌レコードID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AN00246584 | |||||
フォーマット | ||||||
内容記述タイプ | Other | |||||
内容記述 | application/pdf | |||||
著者版フラグ | ||||||
出版タイプ | VoR | |||||
出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
その他のタイトル | ||||||
その他のタイトル | ホトトギス(ユリ科)の大胞子形成過程の電子顕微鏡的観察 | |||||
出版者 | ||||||
出版者 | 横浜国立大学 |