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First published online March 4, 2005; 10.1105/tpc.104.029819

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The Plant Cell 17:1061-1072 (2005)
© 2005 American Society of Plant Biologists

Timing of the Maternal-to-Zygotic Transition during Early Seed Development in Maize{boxw}

Daniel Grimanellia,b,1, Enrico Perottib,2, Jorge Ramirezc and Olivier Leblanca,b

a Institut de Recherche pour le Développement, Unité Mixte de Recherche 5096, 34394 Montpellier, France
b CIMMYT, International Maize and Wheat Improvement Center, A.P. 6-641, 06600 Mexico D.F., Mexico
c Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, A.P. 70242, 04510 Mexico D.F., Mexico

1 To whom correspondence should be addressed. E-mail daniel.grimanelli{at}mpl.ird.fr; fax 33-4-67-41-61-81.

In animals, early embryonic development is largely dependent on maternal transcripts synthesized during gametogenesis. Recent data in plants also suggest maternal control over early seed development, but the actual timing of zygotic genome activation is unclear. Here, we analyzed the timing of the maternal-to-zygotic transition during early Zea mays seed development. We show that for 16 genes expressed during early seed development, only maternally inherited alleles are detected during 3 d after fertilization in both the embryo and the endosperm. Microarray analyses of precocious embryonic development in apomictic hybrids between maize and its wild relative, Tripsacum, demonstrate that early embryo development occurs without significant quantitative changes to the transcript population in the ovule before fertilization. Precocious embryo development is also correlated with a higher proportion of polyadenylated mRNA in the ovules. Our data suggest that the maternal-to-zygotic transition occurs several days after fertilization. By contrast, novel transcription accompanies early endosperm development, indicating that different mechanisms are involved in the initiation of endosperm and embryo development.




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