Plant Cell, January 1st, 2004
INTRODUCTION
Early in their evolution, plants acquired a life cycle that alternates between a multicellular haploid organism, the gametophyte, and a multicellular diploid organism, the sporophyte. Angiosperms have both female and male gametophytes. The female gametophyte is critical to many steps of the angiosperm reproductive process, including pollen tube guidance, fertilization, the induction of seed development upon fertilization, and maternal control of seed development after fertilization. Genetic analysis in Arabidopsis and maize has revealed mutants defective in almost all stages of f...
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