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Journal Article

Fertilization and Embryogeny in Dioon edule

Charles J. Chamberlain
Botanical Gazette
Vol. 50, No. 6 (Dec., 1910), pp. 415-429
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Page Count: 19

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Topics: Embryos, Ova, Spermatozoa, Eggs, Mitosis, Fertilization, Pollen tubes, Cytoplasm, Plant cells, Cotyledons
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1. The liquid from the pollen tube causes a decrease in the turgidity of the neck cells, and this allows a portion of the upper part of the egg to escape, thus forming a vacuole at the top of the egg. The entire sperm is thus drawn into the egg. 2. There are sometimes nine, but oftener ten simultaneous free nuclear divisions, resulting in the formation of 512 or 1024 free nuclei. 3. There is a complete but evanescent segmentation of the entire proembryo, the walls then disappearing except at the base of the proembryo, where they become permanent. 4. The coleorhiza and root cap, although differing in appearance, cell structure, and in function, are formed from the same meristem, and both are morphologically root cap. 5. Plerome, periblem, and dermatogen are differentiated quite late in the development of the embryo. 6. The seed germinates without any resting period, but also has been germinated after a rest of two years.

Notes and References

This item contains 9 references.

Literature Cited
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