渐尖毛蕨和齿牙毛蕨的配子体发育研究

Observation on the gametophyte development of Cyclosorus acuminatus and C.dentatus

关键词:  渐尖毛蕨  齿牙毛蕨  孢子萌发  配子体

Key words:  Cyclosorus acuminatus  C.dentatus  spore germination  gametophyte

摘要:

采用混合土培养渐尖毛蕨和齿牙毛蕨的孢子,显微镜下观察记录了它们的孢子萌发及配子体发育过程。结果表明:两者的孢子均为深褐色,极面观为椭圆形,赤道面观为半圆形,单裂缝; 渐尖毛蕨的孢子萌发所需时间较渐尖毛蕨短,但两者萌发类型均为书带蕨型; 丝状体阶段均发达; 原叶体边缘均可产生少量毛状体; 成熟原叶体均呈心脏形; 由原叶体发育成幼孢子体所需时间略有差异。该文为毛蕨属的研究积累了配子体发育方面的详实资料,为相关类群分类地位和系统关系的研究提供了条件。

Abstract:

The spores of Cyclosorus acuminatus and C.dentatus were cultured in the mixed soil. Their spore germination and gametophyte development were observed by microscope. The result shows that spores of both species are dark-brown,monolete,semicircle-shaped in equatorial view and elliptical in polar view. The spores of C.acuminatus germinate faster than those of C.dentatus. Germination of both species is of the Vittaria-type. Filamental stages of both species are developed. Few hairs can occur on margin of the prothalli of both species. The mature prothalli of both species are cordate. Gametophyte developing time from prothalli to sporophytes differs between both species. This paper accumulates detailed information for gametophyte development of Cyclosorus and provides conditions for systematic classification of pteridophyte.