Abstract
Abstract The phenomenon of polyembryony in Citrus was first described in 1719(1). It is now known that many members of the Rutaceae produce several embryos in each seed. The multiple embryos may include a zygotically-derived embryo and several adventive embryos. The adventive embryos result from differentiation of cells within the nucellar tissue, particularly those near the micropylar region of the ovule (1,6). One of the important horticultural characteristics of seedling Citrus, whether derived from zygotic or nucellar embryos, is the fact that they develop free of viruses even though the parent plant is infested with viruses. With polyembryonic Citrus, disease-free clones can be obtained through plants established from nucellar embryos. This has not been possible with monoembryonic species or varieties of Citrus, inasmuch as the seedlings are all of zygotic origin and vary genetically.
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