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
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
收藏
页码:855 / 861
页数:7
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