頁籤選單縮合
題 名 | 臺灣島槐之胚形成=Embryogenesis in Maackia taiwanensis Hoshi et Ohashi |
---|---|
作 者 | 陳冠瑋; 鄒承志; 劉知妤; 羅漢強; | 書刊名 | 國立臺灣大學生物資源暨農學院實驗林研究報告 |
卷 期 | 23:1=263 2009.03[民98.03] |
頁 次 | 頁47-69 |
分類號 | 373.322 |
關鍵詞 | 臺灣島槐; 胚形成; Maackia taiwanensis; Embryogenesis; |
語 文 | 中文(Chinese) |
中文摘要 | 台灣島槐(Maackia taiwanensis Hoshi et Ohashi)屬豆科,為台灣之特有種;總狀花序,花兩性。二月上旬,花序芽體出現;四月下旬至五月上旬花原體凸出;六月中、下旬,幼花蕾雌蕊原體形成。雌蕊具單一心皮,內含2~5枚胚珠。七月底大孢子母細胞發育;胚珠彎生,具珠被兩層;珠心具四(五)層邊壁層,屬厚珠心型。八月上、中旬,產生縱向直線形的大孢子四分體,近合點端者為功能性大孢子;隨後胚囊母細胞發育成單孢八核胚囊,為何首烏屬型;兩只極核於授精前融合;八月中、下旬完成雙重授精,初級胚乳核先行分裂,接合子後行分裂。胚發育為石竹屬型;胚乳發育屬核型。 |
英文摘要 | Maackia taiwanensis Hoshi et Ohashi is an endemic species of Fabaceae in Taiwan. Hermaphrodite flowers are in racemose. Inflorescence buds occur in early February. Floral primordia emerge from late April to early May. Pistil primordium in young flower bud is formed in mid to late June. A pistil consists of only one carpel which contains 2 to 5 ovules. At end of July, the megaspore mother cell develops in a campylotropous, bitegumic ovule. Nucelli contain 4(-5) parietal layers and belong to Crassinucellate Type. A longitudinal linear megaspore tetrad produced in early to mid August. Of which the megaspore at the chalazal end is functional. Later, the embryo sac mother cell develops into a monosporic 8-nucleate embryo sac, belonging to Polygonum Type. Two polar nuclei fuse before fertilization. Double fertilization proceeds in mid to late August. The primary endosperm nucleus undergoes division earlier than the zygote does. Embryos develop in the way of Caryophyllad Type. Endosperm development is of Nuclear Type. |
本系統中英文摘要資訊取自各篇刊載內容。