Chapter

Sporangium to Seed

Quentin Cronk

in The Molecular Organography of Plants

Published in print January 2009 | ISBN: 9780199550357
Published online May 2009 | e-ISBN: 9780191720154 | DOI: http://dx.doi.org/10.1093/acprof:oso/9780199550357.003.0005
 Sporangium to Seed

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This chapter addresses the evolution of the ovule, the key innovation of the seed plants. The mechanisms by which megasporangia gained coverings or integuments to become ovule (integumented megasporangia) are discussed. The internalization of the gametophyte life cycle with a megaspore and megasporangium is also discussed as is the evolution of microsporangia and megasporangia (heterospory) from a homosporous condition. The molecular control of this process, and the genes responsible, are detailed where they are known, including many of the genes necessary for successful seed reproduction in angiosperms.

Keywords: sporangium; megasporangium; microsporangium; heterospory; homospory; gametophyte; sporophyte; ovule; integuments; endosperm

Chapter.  19274 words.  Illustrated.

Subjects: Plant Sciences and Forestry

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