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Development ePress online publication date 5 Jan 2005
doi: 10.1242/dev.01595

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Research article

Genetic and molecular identification of genes required for female gametophyte development and function in Arabidopsis


Gabriela C. Pagnussat, Hee-Ju Yu, Quy A. Ngo, Sarojam Rajani, Sevugan Mayalagu, Cameron S. Johnson, Arnaud Capron, Li-Fen Xie, De Ye, and Venkatesan Sundaresan*
* Author for correspondence (e-mail: sundar{at}ucdavis.edu.)

The plant life cycle involves an alternation of generations between sporophyte and gametophyte. Currently, the genes and pathways involved in gametophytic development and function in flowering plants remain largely unknown. A large-scale mutant screen of Ds transposon insertion lines was employed to identify 130 mutants of Arabidopsis thaliana with defects in female gametophyte development and function. A wide variety of mutant phenotypes were observed, ranging from defects in different stages of early embryo sac development to mutants with apparently normal embryo sacs, but exhibiting defects in processes such as pollen tube guidance, fertilization or early embryo development. Unexpectedly, nearly half of the mutants isolated in this study were found to be primarily defective in post-fertilization processes dependent on the maternal allele, suggesting that genes expressed from the female gametophyte or the maternal genome play a major role in the early development of plant embryos. Sequence identification of the genes disrupted in the mutants revealed genes involved in protein degradation, cell death, signal transduction and transcriptional regulation required for embryo sac development, fertilization and early embryogenesis. These results provide a first comprehensive overview of the genes and gene products involved in female gametophyte development and function within a flowering plant.
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