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Day-Neutrality in Soybeans

The north-south range of adaptation of soybean [Glycine max (L.) Merr.] varieties is limited because of the photopcriod requirements for anthesis. If daylengthneutral strains could be identified and used in soybean breeding programs, the range of adaptability of soybean varieties might be considerably increased. The U. S. world collection of soybeans of maturity groups 00 and 0 (about 400 strains) was screened for dayneutrality by growing the plants at various photoperiods in the greenhouse. Strains that flowered in the greenhouse in about the same number of days under photopcriods ranging from 12 to 22 hours were identified. Several strains thus identified were also day-neutral with respect to flowering in a field experiment in which various photoperiods were established. Under the field conditions, however, some of the day-neutral strains were delayed in maturity mote than others by the long photoperiods.

Key Words: Glycine max (L.) Merr. • Photoperiod insentivity

² Assistant Professor, Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, Minn. 55101.

Received for publication April 11, 1972.

This article has been cited by other articles:

				E. R. Cober and H. D. Voldeng A New Soybean Maturity and Photoperiod-Sensitivity Locus Linked to E1 and T Crop Sci., May 1, 2001; 41(3): 698 - 701. [Abstract] [Full Text] [PDF]