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LEAFY COTYLEDON1 (LEC1) is a central regulator of seed development that plays a key role in controlling the maturation phase during which storage macromolecules accumulate and the embryo becomes tolerant of desiccation. We queried the genomes of seedless plants and identified a LEC1 homolog in the lycophyte,Selaginellamoellendorffii    , but not in the bryophyte,Physcomitrellapatens    . Genetic suppression experiments indicated that  Selaginella LEC1  is the functional ortholog of    ArabidopsisLEC1 . Together, these results suggest that  LEC1  originated at least 30 million years before the first seed plants appeared in the fossil record. The accumulation of  Selaginella LEC1  RNA primarily in sexual and asexual reproductive structures suggests its involvement in cellular processes similar to those that occur during the maturation phase of seed development.

LEAFY COTYLEDON1, a Key Regulator of Seed Development, Is Expressed in Vegetative and Sexual Propagules of Selaginella moellendorffii