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Variation in Sensitivity to Photoperiod Among Early Maturing Soybean Strains¹

Two experiments were conducted to identify soybean [Glycine max (L.) Merrill] strains that were nonsensitive to photoperiod for possible use as parental lines in a breeding program. Twelve soybean varieties were subjected to photoperiods of 12, 16, 20 and 24 hours in growth cabinets. The number of days from planting until first flower was increased by long photoperiods in all but 1 of 12 varieties. Early maturing varieties were less sensitive to photoperiod than were later varieties. for this reason, 111 soybean strains from Maturity Group 00 were grown in a controlled-environment room at photoperiods of 12, 22, 23 and 24 hours. In approximately 70% of these strains the length of time from planting to flowering was unaffected by photoperiod.

Key Words: Glycine max (L.) Merrill • Day length • Flowering response

² Research Associate and Associate Professor.

Received for publication March 20, 1972.

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