植物学雑誌
Online ISSN : 2185-3835
Print ISSN : 0006-808X
ISSN-L : 0006-808X
35 巻 , 417 号
選択された号の論文の4件中1~4を表示しています
  • Takenoshin Nakai
    1921 年 35 巻 417 号 p. 139-153
    発行日: 1921年
    公開日: 2007/05/24
    ジャーナル フリー
  • Kono Yasui
    1921 年 35 巻 417 号 p. 154-167
    発行日: 1921年
    公開日: 2007/05/24
    ジャーナル フリー
    1. In the prophase of the meiotic division of tile Papaver hybrid, chromosomes forming gemini, unite end to end, not side by side.
    2. There appear 11 bivalent chromosomes and 10 univalent chromosomes in the first meiotic division. The bivalent chromosomes form the equatorial plate first; all the eleven chromosomes may pass to the anaphase simultaneously, or seven of them first and remaining four afterward; the univalent chromosomes may follow the same process after the halves of the bivalent chromosomes left the equator for the opposite poles of spindle. They make the longitudinal split at the equator and the halves move to the opposite poles.
    3. The univalent chromosomes, which remained outside the spindle or did not get to the pole before the nuclear membrane appears, are left in the cytoplasm.
    4. In the second divison of meiosis, the large chromosomes, probably derived from the bivalent chromosomes from the equatorial plate earlier than those from univalent chromosomes. As in first division, some chromosomes derived from the univalent chromosomes are left in the cytoplasm. Some of them remains as isolated chromosomes in the cytoplasm, but some, single or two or more in groups are inclosed by themselves in separate membranes and thus form miniature nuclei.
    5. As the result of the irregular behavior of the chromosomes, occasionarily two daughter nuclei of the first division of meiosis, connected by a bridge of isolated chromosomes, unite to form a single nucleus. The union of two nuclei, beloning to two different spindles of the second meiotic division, also takes place. The result in the appearance much resemble an amitotic division. Such nuclei form a kind of diploid pollen grains.
    6. The irregular behavior of chromosomes in the meiotic division, the union of two nuclei, and dropping of certain chromosome cause the abnormalities of pollen grains, not only in shape and size, but also in the combinations of the heredity substances. This may contribute to the origin of the variation or new forms in the offsprings on the one hand, while this may affect the viability of the male gamates and cause the sterility on the other hand.
    7. F1 plants between Papaver somniferum and P. orientale are more vigorous than their parent plants. The F1 plant appears mostly like P. orientale the _??_ parent, but in some external characters it is intermediate between both parents. The male gamates are mostly sterile.
  • 井狩 二郎
    1921 年 35 巻 417 号 p. 207-218
    発行日: 1921年
    公開日: 2007/05/24
    ジャーナル フリー
    培養ノ結果ハ大體 SAUVAGEAU 氏ノモノト一致ス、而シテ不明ナル點ハ猶今後精細ナル研究ニ俟ツベキモノアリ。其結果ヲ摘要スルコト左ノ如シ。
    一、游走子ハ明ニ眼點ヲ備ヘ、著シキ趨光性ヲ有ス。
    一、Embryospore ハ發芽シ、内容物ノ大部分ハ新生部ニ移ル、色素粒ハ分裂ニヨリテ二分セラレ、此前後ニ眼點消失ス。隔膜ノ形成ハ此以後ニ在リ。
    一、配偶體ハ一般ニ雌雄異株ニシテ其形多樣ナリ。雌性配偶體上ニ生ジタル藏卵器ノ開裂ニヨリ脱出シタル卵子ハ、漏斗状開裂部ニ密着ス、而シテ其部分ハ増厚シテ卵子ノ下部ヲカラー状ニ包ム。雄性配偶體ノ藏精器ハ各個別々ニ開口スルモノト、互ニ、連接シタル最上部ノ先端ニ開口スルモノトアリ。
    一、稀ニ雌雄同株ノ配偶體ヲ生ズ。
    一、比較的温度高キ場合ニハ速カニ發育シ、其形態稍々複雜スルモ、温度低キトキハ發育遲々トシテ比較的簡單ナル經過ニヨリ芽胞體ヲ發生ス。
    一、自然界ニ在リテモ芽胞體ハ藏卵器ノ開裂ニヨリ生ズ。恐ラクハ海中ニ脱出セシ游走子ハ Embryospore、若クハ、之ト近キ状態ニ於テ、適當ナル時期ヲ待チテ直チニ芽胞體ヲ生ズルナラント相像ス。培養ニ於ケル如キ多細胞ノ配偶體ヲ生ズルハ疑問トスル所ナリ。
  • 1921 年 35 巻 417 号 p. 220-222
    発行日: 1921年
    公開日: 2013/05/14
    ジャーナル フリー
feedback
Top