megagametophyte - Hutchinson encyclopedia article about megagametophyte Printer Friendly
Dictionary, Encyclopedia and Thesaurus - The Free Dictionary
3,581,117,142 visitors served.
forum Join the Word of the Day Mailing List For webmasters
?
Dictionary/
thesaurus
Medical
dictionary
Legal
dictionary
Financial
dictionary
Acronyms
 
Idioms
Encyclopedia
Wikipedia
encyclopedia
?

ovule
(redirected from megagametophyte)

    Also found in: Dictionary/thesaurus, Medical, Encyclopedia, Wikipedia 0.01 sec.

ovule

Structure found in seed plants that develops into a seed after fertilization. It consists of an embryo sac containing the female gamete (ovum or egg cell), surrounded by nutritive tissue, the nucellus. Outside this there are one or two coverings that provide protection, developing into the testa, or seed coat, following fertilization.

In angiosperms (flowering plants) the ovule is within an ovary, but in gymnosperms (conifers and their allies) the ovules are borne on the surface of an ovuliferous (ovule-bearing) scale, usually within a cone, and are not enclosed by an ovary.
How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content.
?Page tools
Printer friendly
Cite / link 		Feedback
?Sign in SSL protected
Email:
Password:
Register

Mentioned in?  References in periodicals archive?   Hutchinson browser?   Full browser?
 
Seed coat when mature consisting of a red or orange/red or white outer fleshy layer and an inner stony layer; megagametophyte farineacous; embryo with two cotyledons and a coiled suspensor.
Cycads of Colombia by Stevenson, Dennis Wm. / The Botanical Review
In Microcycas, for example, both the microgametophyte and the megagametophyte are apparently primitive, for both are multigametic (up to 100 or more archegonia per megametophtye, though only a few are functional).
Comparative development of the spermatozoids of cycads and Ginkgo ... by Norstog, Knut J.; Gifford, Ernest M.; Stevenson, Dennis Wm. / The Botanical Review
Regeneration in the megagametophyte of Zamia floridana.
Seed coat anatomy of Ceratozamia mexicana (Cycadales) by Sanchez-Tinoco, Maria Ydelia; Engleman, E. Mark / The Botanical Review
 
 
 
Hutchinson Encyclopedia
?

Terms of Use | Privacy policy | Feedback | Copyright © 2012 Farlex, Inc.
Disclaimer
All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional.