Abstract

在组织培养条件下,对麦秆蹄盖蕨(Athyrium fallaciosum)配子体发育的连续过程进行了详细观察。结果表明:麦秆蹄盖蕨孢子为四面体型;孢子萌发为书带蕨型(Vittaria-type);原叶体发育为铁线蕨型(Adiantum-type),成熟原叶体为对称的心形;精子器近圆球形,成熟颈卵器细长,常向原叶体基部倾斜或弯曲。常规播种条件下,发现麦秆蹄盖蕨配子体有雌配子体、雄配子体、雌雄同体配子体和无性配子体类型。配子体的性别随密度不同而呈现一定的变化趋势,雄配子体随密度增大呈上升趋势;雌配子体随密度增大先上升后下降;雌雄同体配子体和无性配子体随密度变化不大。雌配子体和雌雄同体配子体具颈卵器数目一般为10~15个;精子器数目随密度的增大逐渐减少,雄配子体中具有约50个精子器,雌雄同体配子体具有约20个精子器。

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