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Inheritance and Morphological Traits of a Phytochrome-controlled Single Gene in Bean¹

Three bean (Phaseolus vulgaris L.) lines that changed from indeterminate non-climbing bush to indeterminate climbing, with control by the red/far-red light ratio, were crossed with a line which remained an indeterminate non-climbing bush under all red/far-red ratios. The climbing trait was found to be controlled by one major gene based on segregation data in F₂ and backcross progeny from crosses to both parents. Red light stimulated the activity of this dominant allele and far-red light retarded it. As climbing occurred, internode elongation was greater in climbing than non-climbing plants. Genetic control of flowering sensitivity to long-day photoperiod was independent of the gene for climbing vs. non-climbing growth habits. It was concluded that flowering and climbing are two genetically independent phytochrome-controlled responses.

Key Words: Flowerin • Photomorphogenesis • Stem elongation • Phaseolus vulgaris L.

² Graduate research assistant (now physiologist, Centro Int. de Agric. Tropical, Apartado Aereo 6713, Cali, Colombia); director of research, CIAT; professor, Cornell Univ., Ithaca, N.Y.

Received for publication January 15, 1979.

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