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題 名 | Observations on Gametophytesand Juvenile Sporophytes of Archangiopteris Somai Hayata (Marattiaceae), an Endangered Fern in Taiwan=一種瀕臨滅絕的蕨類--臺灣原始觀音座蓮(觀音座蓮舅科)--配子體與幼孢子體的觀察 |
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作 者 | 周雪美; 黃曜謀; 翁韶良; 謝宗欣; 徐昇圓; 邱文良; | 書刊名 | Botanical Studies |
卷 期 | 48:2 2007.04[民96.04] |
頁 次 | 頁205-213 |
分類號 | 378.13 |
關鍵詞 | 臺灣原始觀音座蓮; 染色體; 厚囊蕨類; 配子體; 幼孢子體; 觀音座蓮舅科; 孢子; Archangiopteris somai; Chromosome; Eusporangiate fern; Gametophyte; Juvenile sporophyte; Marattiaceae; Spore; |
語 文 | 英文(English) |
中文摘要 | 台灣原始觀音座蓮是一台灣產特有的厚囊蕨類。由於其族群與數量稀少,被歸類為瀕臨滅絕的種類。培養時其孢子在灑播二週後開始發芽;配子體以「觀音座蓮舅(Marattia)」型發育,配子體生長過程由圓形轉心臟形再形成分支。藏精器與藏卵器分別在孢子灑播10及12月後發生;藏精器長在中肋的背面及腹面,藏卵器只在腹面發生;兩性配子體的藏精器與藏卵器混生一起,兩者均屬厚囊蕨型。抱子體在經13個月的培養後開始產生,每個配子體雖然有許多的藏卵器,但只產生一株孢子體,第一片孢子體的葉片為單葉羽狀脈。經過三年的培養,只有3%的配子體產生孢子體。由於孢子體的生成至少需13個月,以及其低生成率,可能導致其野外族群之擴增極為緩慢且困難。 |
英文摘要 | Archangiopteris somai is an endemic eusporangiate fern in Taiwan. It is classified as an endangered species because there are only a few small populations. In culture, spores germinated two weeks after sowing. Gametophyte development is of the “Marattia” type. Gametophyte shape changed from circular, to cordate, to branched. Antheridia and archegonia appeared 10 and 12 months, respectively, after spores were sown. Antheridia occurred in the cushion on the dorsal and ventral surfaces of gametophytes while archegonia were observed on the ventral surface only. On hermaphroditic gametophytes, antheridia and archegonia were usually intermingled. Both types of gametangia were eusporangiate. After 13 months culture, sporophytes began to form. Each gametophyte had several archegonia, and only one sporophyte was produced per gametophyte. The first sporophyte frond was simple and had pinnate venation. After 3 years of culture, only 3% of the gametophytes produced a sporophyte. It took a minimum of 13 months after a spore sowing for a sporophyte to be produced by a gametophyte. Increasing the wild population will likely be slow and difficult. |
本系統中英文摘要資訊取自各篇刊載內容。