https://scholars.lib.ntu.edu.tw/handle/123456789/636448
標題: | The orchid seed coat: a developmental and functional perspective | 作者: | YUNG-I LEE Yeung, Edward C. |
關鍵字: | Bitegmic integument | Carapace | Embryo | Funiculus | Inner and outer integument | Micropyle | Seed coat | Unitegmic integument | 公開日期: | 1-十二月-2023 | 出版社: | Springer Science and Business Media Deutschland GmbH | 卷: | 64 | 期: | 1 | 起(迄)頁: | Article number 27 | 來源出版物: | Botanical Studies | 摘要: | Orchid seeds are 'dust-like.' The seed coat is usually thin, with only one to a few cell layers. It originates from the integuments formed during ovule development. In orchids, the outer integument is primarily responsible for forming a mature seed coat. The inner integument usually fails to develop after fertilization, becomes compressed, and collapses over the expanding embryo. Hence, the seed coat is formed from the funiculus, chalaza, and outer integumentary cells. The outermost layer of the seed coat, the testa, is lignified, usually at the radial and inner tangential walls. The subepidermal thin-walled layer(s), the tegmen, subsequently cold, resulting in seeds having only a single layer of seed coat cells. In some species, cells of the inner integument remain alive with the ability to synthesize and accumulate lipidic and or phenolic compounds in their walls covering the embryo. This cover is called the 'carapace,' a protective shield contributing to the embryo's added protection. A developmental and functional perspective of the integuments and seed coat during seed development and germination is presented in this review. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/636448 | ISSN: | 1817406X | DOI: | 10.1186/s40529-023-00400-0 |
顯示於: | 生命科學系 |
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