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Comparative Development of the Spermatozoids of Cycads and Ginkgo biloba
Knut J. Norstog, Ernest M. Gifford and Dennis Wm. Stevenson
Vol. 70, No. 1 (Jan. - Mar., 2004), pp. 5-15
Stable URL: http://www.jstor.org/stable/27571170
Page Count: 11
You can always find the topics here!Topics: Spermatozoa, Plants, Seeds, Beak, Cell membranes, Plant cells, Spermatids, Spermatogenesis, Gametophytes, Microtubule organizing center
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Cycads and Ginkgo biloba are the only extant seed plants that produce flagellated male gametes. Superficially, the cells of both are similar in structure and function. In both the motile organelles arise from multicentriolar bodies, the blepharoplasts, and, in both forms, these give rise to a complex fibrous band, the multilayered structures are much alike in cycads and Ginkgo. However, there are marked differences in details of their development, particularly in the presence of a "nucellar beak" in Ginkgo.
Botanical Review © 2004 New York Botanical Garden Press