植物分类学报

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中国水韭属植物的孢子形态特征

1刘星; 2刘虹; 1王青锋*   

  1. 1(武汉大学生命科学学院植物系统学与进化生物学研究室 武汉 430072)
    2(中南民族大学生命科学学院 武汉 430074)
  • 收稿日期:2006-11-29 修回日期:2007-04-18 出版日期:2008-07-18 发布日期:2008-07-18
  • 通讯作者: 王青锋 E-mail:qfwang@whu.edu.cn

Spore morphology of Isoëtes (Isoëtaceae) from China

1Xing LIU; 2Hong LIU; 1Qing-Feng WANG*   

  1. 1(Laboratory of Plant Systematics and Evolutionary Biology, College of Life Sciences, Wuhan University, Wuhan 430072, China)
    2(College of Life Sciences, South-Central University for Nationalities, Wuhan 430074, China)
  • Received:2006-11-29 Revised:2007-04-18 Online:2008-07-18 Published:2008-07-18
  • Contact: Qing-Feng WANG E-mail:qfwang@whu.edu.cn

Abstract: Micromorphological characters of mega- and microspores of five Isoëtes species from China were observed under scanning electron microscope (SEM). Megaspores of I. hypsophila have a levigate ornamentation, and are 358 µm in diameter (mean, n=30), microspores of this species have a gyrus ornamentation, and are 22 µm in length (mean, n=30); megaspores of I. yunguiensis have a cristate-reticulate ornamentation, with a size of 390 µm in diameter (mean, n=30), while microspores nearly smooth with some fine granulates, and with a size of 22 µm in length (mean, n=30); megaspores of I. taiwanensis are tuberculate and 312 µm in diameter (mean, n=30), echinate microspores are 24 µm in length (mean, n=30); cristate megaspores of I. sinensis are 409 µm in diameter (mean, n=30), and echinate microspores are 28 µm in length (mean, n=30); megaspores of I. orientalis have a cristate-reticulate ornamentation, with diameter of 420 µm (mean, n=30), microspores of this species have an echinate-tuberculate ornamentation with a size of 34 µm in length (mean, n=30). Based on the morphological characters of spores and chromosome numbers among taxa, it was found that mean spore size in each species of Isoëtes generally reflected the ploidy level. I. hypsophila, I. yunguiensis and I. taiwanensis, with smaller mean spore size, are diploidy with 2n=22; I. sinensis (2n=44) and I. orientalis (2n=66), with larger mean spore size, are polyploidy. The spore morphology of Isoëtes still plays an important role in identification and classification of Isoëtes from China.

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