| 摘要: |
| 于1986年10月在厦门近岸采集北方劳德藻，从培养中观察其有性生殖和光对生殖的影响。结果表明，该藻只有宽度为26 – 40 μm的细胞能形成配干和复大孢子；在光照条件下每昼夜只发生1次性化；雌雄配子以不同发育方式形成，配子发生呈现一定的时间程序；强光照和16h光周期最适于性化。由此得知，引起性化既依赖适当的细胞大小，又依赖光诱导的外部因素；产生两种精子数目是与精原抱囊的体积大小紧密相关；性化与光强度之间的关系呈正相关；长的或连续的光照性化反应受抑制，而光强度和光周期对性化反应是互补作用。 |
| 关键词: 北方劳德藻 有性生殖 配子 复大孢子 光周期 光强度 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金资助，3880038号;福建省自然科学基金资助，C90013号 |
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| PRODUCTION OF GAMETES AND AUXOSPORES IN THE CENTRIC DIATOM LAUDERIA BOREALlS GRAN |
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Lin Junmin, Weng Shide
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Department of Biology, Xiamen Unirersity, Xiamen 361005
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| Abstract: |
| Lauderia borealis was collected from the Xiamen coast in October in 1986. Observation of the sexual process of this diatom and the effect of light on its reproduction showed that only the 24 – 40 μm wide cells can form gametes and auxospores. The sexualization may occur only once a day under proper light condition. Male and female gameles are formed in different development ways and the gametogeny exhibites a certain temporal pattern. High light intensity and 16h were found to be optimal for sexualization. Thus, the induction of sexualization in this diatom depends not only on a suitable cell size but also on light as an external factor. The 32 or 64 sperms produced are related closely to the spermatogonangium volume. The sexualization has positive correlation with light intensity, and the sexual reaction is inhibited by long or continuous illumination. Light intensity and photoperiod play apparently complementary roles in sexual reaction. |
| Key words: Lauderia borealis, Sexual reproduction, Gametes, Auxospores, Photoperiod, Light intensity |
