A Monogenic Recessive Gene, fw, Conditions Flower Doubling in Nicotiana alata

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  • 1 Department of Horticulture, University of Wisconsin, 1575 Linden Drive, Madison, WI 53706

A double-flower form of Nicotiana alata Link & Otto was characterized genetically as a monogenic recessive trait expressed when homozygous. Reciprocal crosses demonstrated no maternal effect on expression of double flowers. A single dominant gene expressed in the homozygous or heterozygous state caused the single-flower phenotype. The symbol fw is proposed to describe the gene controlling double-flower phenotype.

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