碩士 / 國立中興大學 / 生命科學院碩士在職專班 / 93 / Abstract
The purpose of this research is to distinguish the role of stem and leaf by studying the growth process of the embryo and seedling in Utricularia aurea Lour. The embryo of U. aurea consists of large cells and small meristematic cells, lacking well-developed structures, such as cotyledons, plumule or radicle as in ordinary dicotyledonous plants. The large cells contain numerous storage grains for the development of seedlings, as the function of cotyledons or endosperm. During the seed germination, primary leaves break out of the testa from the abaxial side of the embryo; and there is no radicle developed adjacent to the hilum. Primary leaves contain no storage grains, and begin photosynthesis when breaking out of the testa. Because the function of primary leaves differs from that of cotyledons, we recognize primary leaves as “leaves”. Stolon continues to grow after detaching from primary structure. Stolon bears lateral branches, leaves, traps, air shoots and inflorescences. Based on the morphological, anatomical and functional evidence, the stolons are similar to the roots by the arrangement of vascular tissues. However, more differences can be found in structures between stolons and roots, such as stolons have no endodermis and root cap. Moreover, the primordia of lateral branches, leaves, traps, air shoots and inflorescences are all initiated by the apical meristem of stolon. Such evidence supports that the stolon of U. aurea should be defined as “stem”. Also, we clarify the role of the leaves by the evidence that the primordia initiate from the apical meristem of stolon, and they grow determinately.
| Identifer | oai:union.ndltd.org:TW/093NCHU1105011 |
| Date | January 2005 |
| Creators | Ting-Ho Tsai, 蔡婷合 |
| Contributors | Shu-Chuan Hsiao, 蕭淑娟 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 53 |
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