尖喙牻牛儿苗繁殖体外部形态特征

被引：7

作者：

王莎莎 ^{[1
,2
]}

张元明 ^{[1
]}

机构：

[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

[2] 中国科学院研究生院

来源：

生态学杂志 | 2010年 / 29卷 / 05期

关键词：

尖喙牻牛儿苗; 繁殖体; 形态特征; 吸湿运动; 适应性;

D O I：

10.13292/j.1000-4890.2010.0134

中图分类号：

Q948 [植物生态学和植物地理学];

学科分类号：

071012 ; 0713 ;

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。

引用

页码：855 / 861

页数：7

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