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The Journal of Heredity 1998:89(1)
© 1998 The American Genetic Association 89:86-87

Brief communication. A recessive gene for revolute cotyledons in cucumber

TC Wehner1, JE Staub2, and JS Liu3

1Department of Horticultural Science, North Carolina State University, Raleigh, NC 27695-7609, USA 2Department of Horticulture, University of Wisconsin, Madison, Wisconsin, USA 3Department of Horticulture, Nanjing Agricultural University, Nanjing, China

An experiment was conducted to determine the genetics of the revolute cotyledon trait in the cucumber inbred NCG-093 (short petiole mutant). NCG-903 was crossed with inbred WI 2757 to produce F1, F2 and BC1 generations for evaluation. The F1 progeny had normal cotyledons, and the segregation of the F2 progeny fit a ratio of 3 normal: 1 revolute cotyledons. The BC1A(F1 X WI 2757) progeny had normal cotyledons, and the segregation of the BC1B(F1 X NCG-093) fit a ratio of 1 normal:1 revolute cotyledons. We concluded that revolute cotyledons in NCG-093 was conferred by a single recessive gene, revolute cotyledons-2, for which we propose the symbol rc-2. A mutant from Burpless Hybrid was previously described as having revolute cotyledons, controlled by the rc gene. However, that mutant was apparently lost, making it impossible to test allelism with the gene in NCG-093.


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