Studies on the Development of Gametophyte and Oogenesis of the Fern Microlepia platyphylla

doi:10.7677/ynzwyj201414023

Abstract

Abstract:

Gametophyte development and oogenesis of the fern Microlepia platyphylla were studied using microscopy and transmission electron microscopy. The present studies have significance in clarifying the cytology mechanism of oogenesis and reveal the evolution status of Mplatyphylla. The spores are brown, tetrahedral and trilete. The spores germinate about 5-10 days after sowed. They develop into cordate prothallus through filament and plate stages. The development of the prothallus is the Adiantumtype. The adult prothallus are usually diecious. Antheridia (an) us ually are produced on irregular prothallus and archegonium (ar) are produced near the apical notch of the heartshaped prothallus. Sex organs are Leptosporangiatetype. Studies on the oogenesis showed that the archegonium develops from a superfacial initial cell under the growth point. Two divisions of the initial cell result in a tier of three cells, ie the upper cell, primary cell and basal cell. The primary cell finally develops into a neck canal cell, a ventral canal cell and an egg by two unequal divisions. The three cells were associated closely with each other. Then the neck canal cell and the ventral canal cell degenerated gradually. A separation cavity was formed between the ventral canal cell and the egg cell, but plasmodesmata still connected the ventral canal cell and the egg in pore region. Egg envelope and fertilization pore were formed in the matured egg. Nuclear evaginations were produced from the nuclear surface. It was showed that oogenesis of the fern Mplatyphylla is similar to the fern Pteridium aquilinum.

Key words: Fern, Microlepia platyphylla, Gametophyte development, Oogenesis

CLC Number:

Q 944-33

GUO Yan-Dong, WANG Quan-Xi, LI Bao-Gui, CAO Jian-Guo. Studies on the Development of Gametophyte and Oogenesis of the Fern Microlepia platyphylla[J]. Plant Diversity, 2014, 36(06): 747-754.

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