| 尖喙(牛龍)牛儿苗繁殖体外部形态特征 |
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| 引用本文： | 王莎莎,张元明.尖喙(牛龍)牛儿苗繁殖体外部形态特征[J].生态学杂志,2010,29(5):855. |
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| 作者姓名： | 王莎莎 张元明 |
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| 作者单位： | 1. 干旱区生物地理与生物资源重点实验室,中国科学院新疆生态与地理研究所,乌鲁木齐,830011;中国科学院研究生院,北京,100039
2. 干旱区生物地理与生物资源重点实验室,中国科学院新疆生态与地理研究所,乌鲁木齐,830011 |
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| 基金项目： | 中国科学院知识创新工程重要方向项目(KZCX2-YW-336); 国家重点基础研究发展计划资助项目(2009CB825104) |
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| 摘 要： | 尖喙牻牛儿苗(Erodium oxyrrhynchum)是古尔班通古特沙漠短命植物层片优势物种,其繁殖体能够在生物结皮上成功定居,借助扫描电镜等方法对其繁殖体形态进行了观察。结果表明:尖喙牻牛儿苗繁殖体表皮附属毛具4种不同类型,在保持水分和固定繁殖体等方面发挥作用,是对散布和定居的一种适应;果实与芒连结部位存在过渡区和分裂缝隙;芒吸湿后与种子长轴夹角逐渐减小,表皮细胞发生形变,是吸湿运动的形态基础,这种形态变化可以促使繁殖体在地面行走,遇到适宜的生境时,推动种子钻入土壤而定居。本研究为揭示该种定居适应机制提供了形态学依据。
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| 关 键 词： | 尖喙牻牛儿苗 繁殖体 形态特征 吸湿运动 适应性 |
Morphological characters of Erodium oxyrrhynchum diaspore. |
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| WANG Sha-sha,ZHANG Yuan-ming.Morphological characters of Erodium oxyrrhynchum diaspore.[J].Chinese Journal of Ecology,2010,29(5):855. |
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| Authors: | WANG Sha-sha ZHANG Yuan-ming |
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| Institution: | WANG Sha-sha1,2,ZHANG Yuan-ming1 (1Key Laboratory of Biogeography , Bioresource in Arid L,,Xinjiang Institute of Ecology , Geography,Chinese Academy of Sciences,Urumqi 830011,China,2Graduate University of Chinese Academy of Sciences,Beijing 100039,China). |
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| Abstract: | Erodium oxyrrhynchum is a dominant ephemeral plant in the Gurbantunggut Desert. Its diaspore can successively establish on soil bio-crust. In this paper, a laboratory experiment was conducted under controlled conditions, and scanning electron microscopy was used to observe the morphological changes of the diaspore following hygroscopic absorption. The appending hairs located on the epidermis of the diaspore had four types, playing important roles in the moisture retention and diaspore fixation, and being co... |
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| Keywords: | Erodium oxyrrhynchum diaspore morphological character hygroscopic movement adaptability |
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