Abstract
Cytophotometric studies of both mature and embryonic tissues of white ash (Fraxinus americana L.) revealed considerable variability of nuclear DNA content in this dioecious polyploid species (2n = 46, 92, 138). Triploid and pentaploid embryos may be produced, and mature individuals of these odd ploidy levels, in turn, may occur in natural populations. Polyploidy may have originated in this species through the union of unreduced gametes.
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