Inheritance of Twisted Pods in Common Bean (Phaseolus vulgaris L.)

in Journal of the American Society for Horticultural Science
Authors: J.R. Baggett1 and D. Kean1
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  • 1 Department of Horticulture, Oregon State University, Ag. and Life Sciences Bldg. 4017, Cowallis, OR 97331-7304

Inheritance of a twisted pod characteristic, in which bean pods develop with a twist that sometimes exceeds 360°, was studied in crosses between round-podded green bean cultivars. In crosses between `Oregon 91G' (normal) or `Oregon 54' (normal) and OSU 5256-1 (twisted), the F1 was normal. Segregation in F2 populations, tested over a 4-year period and including 4,995 plants, clearly fit a 3 normal: 1 twisted ratio. All plants of backcrosses of the F, to the normal parent were normal and backcrosses of the F1 to the twisted parent segregated 1 normal: 1 twisted. The ratios observed indicated that twisted pods are conditioned by a single recessive gene for which the symbol tw is proposed.

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