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Genetic Control of a Photoperiod—Temperature Response for Time of Flowering in Beans (Phaseolus vulgaris L.)¹

In the first experiment conducted in the field on the inheritance of date of flowering in the cross between the early flowering ‘G.N. 1140’ and the late flowering PI 165078 cultivars of Phaseolus vulgaris L. it was found that this trait was controlled primarily by a single major gene with late flowering being recessive. The symbol fd was assigned to this recessive gene.

In a second experiment conducted in growth chambers it was observed that PI 165078 flowered at a later date than G.N. 1140 when grown under long days (14 hours), and 29.4 C and 26.7 C (day and night) temperatures, but that there was no significant difference in date of flowering of the varieties under the 14-hour photoperiod, and 26.7 C and 21.1 C. The increase in temperature under a 14-hour day produced a differential response in date of flowering of the varieties.

Key Words: Great Northern • PI line • genotype — environment interaction • Qualitative inheritance

² Professor, Department of Horticulture and Forestry, University of Nebraska, Lincoln, Nebr.

Received for publication July 19, 1969.

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