頁籤選單縮合
題名 | Development of Staminate Cone and Microsporogenesis in Cephalotaxus Wilsoniana Hay.=臺灣粗榧之雄毬花發育及小孢子形成 |
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作者 | 羅漢強; 王玉芬; Lo, Hann-chung; Wang, Yu-fen; |
期刊 | Proceedings of the National Science Council : Part B, Life Science |
出版日期 | 19990400 |
卷期 | 23:2 1999.04[民88.04] |
頁次 | 頁85-98 |
分類號 | 377.1 |
語文 | eng |
關鍵詞 | 臺灣粗榧; 雄毬花發育; 小孢子形成; Cephalotaxux wilsoniana hay.; Staminate cone development; Microporogenesis; |
英文摘要 | Cephalotaxus wilsoniana Hay. is a species of gymnosperms endemic to Taiwan. This study examined morphologically and anatomically the development of staminate cones and microsporogenesis of the species for the purpose of conservation. The duration from formation of staminate buds to shedding of pollen grains in C. wilsoniana is more than six months. Staminate buds appear in early October. The archesporium originates in microsporophyll primordium in late October. The sporogenous tissue proliferates and the tapetum layer becomes distinct in the middle of November. Pollen mother cells develop at late December and rest in January. Meiosis takes place in pollen mother cells in mid-February. Tetrad microspores separate from each other between late February and early March. A generative cell and a tube cell appear in each pollen grain in late March. Pollen grains are shed between late March and early April. A mature compound head consists of 8~9 (5 basal, 2~3 lateral and 1 terminal) staminate cones. Each male cone has a cone axis, on which 4~15 microsporophylls are spirally arranged. There are two forms of mi-crosporophyll which bear 2~4 abaxial hyposporangia or 4~6 whorled perisporangia on a stalk. |
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