Diallel Analysis of Seven Economic Characters in Snap Beans1

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Abstract
Seven varieties of snap beans (Phaseolui vulgaris L.) (‘Wade,’ ‘Earligreen,’ ‘Earliwax,’ ‘Streamliner,’ ‘Harvest King,’ ‘Slendergreen,’ and ‘Tendercrop’) and all possible F2's among them were evaluated. Number of seeds per plant, number of seeds in the best five pods, length of pod, number of pods per plant, days to flowering, plant height, and width were determined.Additive genetic variance was predominant in the first five traits, but not for plant height and width. Pod number also showed some dominance, with recessive genes contributing to high pod number. Inheritance of seed number per plant and per pod resulted in interactions where Tendercrop and Streamliner were included, but without these two varieties a simple additive system is apparent. Pod length was under additive genetic control without dominance. Days to flowering was additive, but over‐dominance was expressed for earliness. The data indicate which parents would be the best for the characters studied, with Earligreen and Slendergreen appearing to be superior.