INHERITANCE OF TWISTED PODS IN COMMON BEAN (PHASEOLUS-VULGARIS L)

Inheritance of a twisted pod characteristic, in which bean pods develo p with a twist that sometimes exceeds 360 degrees, was studied in cros ses between round-podded green bean cultivars, In crosses between 'Ore gon 91G' (normal) or 'Oregon 54' (normal) and OSU 5256-1 (twisted), th e F-1 was normal, Segregation in F-2 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-1 to the normal parent were normal and backcrosses of the F-1 to the twisted parent segregated 1 normal : I twisted, The ratios observed indicated that twisted pods ar e conditioned by a single recessive gene for which the symbol tw is pr oposed.