Ontogeny of the sporangia of Sphaeropteris cooperi
Ontogeny of the sporangia of Sphaeropteris cooperi
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DOI：
10.2307/1547423
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发表时间：
1999-07-01
影响因子：
0.8
通讯作者：
Wilson, KA
中科院分区：
文献类型：
--
作者：
Wilson, KA
采用石蜡包埋和切片的方法，对古柏球蕨孢子囊的发育过程进行了研究。孢子囊由一个表面原始细胞发育而成，原始细胞分成五个原始细胞或“片段”。位于表面花托细胞水平的0节，不会再细分，也不会进一步促进成熟孢子囊的结构。第I、II、III和IV节通过一系列的分裂而被进一步细分，以产生成熟的孢子囊。四列孢子囊柄由节I和部分节II形成，蒴果由部分节II和节III和IV发育。瓣环在II和IV段发育。本文对古柏球蕨孢子囊的发育模式与细孔囊高等蕨类孢子囊的发育模式进行了比较。
The ontogeny of the sporangia of Sphaeropteris cooperi was studied using cleared whole mounts of sporangia in different stages as well as sori embedded in paraffin and sectioned. The sporangia develop from a single superficial primordial cell that becomes divided into five initials or "segments." Segment 0, located at the level of the surface receptacular cells, does not become subdivided and does not contribute further to the structure of the mature sporangium. Segments I, II, III and IV each become subdivided through a series of divisions to produce the mature sporangia. The four-rowed sporangial stalks are formed from Segment I and part of Segment II, and the capsules develop from a part of Segment II and Segments III and IV. The annulus develops in Segments II and IV. The developmental pattern of the sporangia of Sphaeropteris cooperi is compared to that of the sporangia of higher leptsoporangiate ferns.