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題 名 | 同型孢子蕨類配子體的生殖生物學=The Reproductive Biology of Gametophytes of Homosporous Ferns |
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作 者 | 邱文良; 李沛軒; 黃曜謀; | 書刊名 | 臺灣林業科學 |
卷 期 | 18:1 2003.03[民92.03] |
頁 次 | 頁67-73 |
分類號 | 378.13 |
關鍵詞 | 配子體; 同型孢子蕨類; 配育系統; 生殖生物學; Gametophyte; Homosporous ferns; Mating system; Reproductive biology; |
語 文 | 中文(Chinese) |
中文摘要 | 同型孢子蕨類的孢子體可經由同配子體自交、異配子體交配兩類配育系統或以無配生殖的方式產生,異配子體交配又可分為異配子體自交和異配子體異交兩種方式。配育系統與其配子器個體發生、遺傳負荷、倍體性、促精素等因素有關。配子器個體發生行為造成配子體不同性別的發育,不同的性別表現可導致不同的配育途徑,例如同配自交只有在同配子體的雌雄配子同時成熟,且精子被釋放的情況下才可能發生。遺傳負荷可測定隱性致死基因率,遺傳負荷愈小,同配子體自交機率愈大;遺傳負荷愈大,異配子體交配的發生率愈高。多倍體之蕨類多行同配子體自交,反之,二倍體蕨類之配育則以異配子體交配為主。有些蕨類可分泌促精素,有助於藏精器甚或雄性配子體的發生,進而利於異配子體交配的發生。除了有性生殖外,部份蕨類植物藉無配生殖的方式產生後代。不同的生殖策略或利於其拓展新族群,或有助於增加遺傳多樣性,甚或在乾燥環境下仍得以繁殖。 |
英文摘要 | Homosporous ferns produce sporophytes by intragametophytic selfing, intergametophytic mating, or apogamy. Gametangium ontogeny, genetic load, and ploidy affect the mating system of each species. Gametangium ontogeny causes different sexual expressions and may permit or prohibit intragametophytic selfing. Only in the situation in which the male and femal gametangia on the same gametophyte mature at the same time and release sperm is intragametophytic selfing likely to occur. Genetic load is a measure of the effects of deleterious genes on fitness. The lower the genetic load, the higher the probability of intragametophytic selfing. As the genetic load increases, so does the frequency of intergametophytic mating. Intragametophytic selfing is characteristic of polyploid species, whereas most diploid species reproduce by intergametophytic mating. Antheridiogen promotes antheridium and male gametophyte formation. Thus, intergametophytic mating is more frequent and more successful in those species with high antheridiogen production. In addition to sexual reproduction, some ferns produce sporophytes by apogamy. Each reproductive strategy is favorable for creating a new population (intragametophytic selfing, apogamy), increasing genetic diversity (intergametophytic mating), or producing offspring in drier habitats (apogamy). |
本系統中英文摘要資訊取自各篇刊載內容。