Format

Send to

Choose Destination
See comment in PubMed Commons below
Nature. 2000 Mar 2;404(6773):91-4.

Delayed activation of the paternal genome during seed development.

Author information

1
Cold Spring Harbor Laboratory, New York 11724, USA.

Abstract

Little is known about the timing of the maternal-to-zygotic transition during seed development in flowering plants. Because plant embryos can develop from somatic cells or microspores, maternal contributions are not considered to be crucial in early embryogensis. Early-acting embryo-lethal mutants in Arabidopsis, including emb30/gnom which affects the first zygotic division, have fuelled the perception that both maternal and paternal genomes are active immediately after fertilization. Here we show that none of the paternally inherited alleles of 20 loci that we tested is expressed during early seed development in Arabidopsis. For genes that are expressed at later stages, the paternally inherited allele becomes active three to four days after fertilization. The genes that we tested are involved in various processes and distributed throughout the genome, indicating that most, if not all, of the paternal genome may be initially silenced. Our findings are corroborated by genetic studies showing that emb30/gnom has a maternal-effect phenotype that is paternally rescuable in addition to its zygotic lethality. Thus, contrary to previous interpretations, early embryo and endosperm development are mainly under maternal control.

PMID:
10716449
DOI:
10.1038/35003595
[Indexed for MEDLINE]
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for Nature Publishing Group
    Loading ...
    Support Center