Abstract
Abstract Four rose cultivars (‘Mercedes’, ‘Sonia’, ‘Visa’, and ‘Golden Times’) were grown under four night temperature regimes: 1) constant 18°C; 2) constant 14°; 3) 18° until midnight followed by 14° until 1 hr before sunrise; and 4) 18° alternated every 2 hr by 14°. A minimal temperature of 18° was maintained from 1 hr before sunrise in all treatments. Low temperature regimes resulted in an increase in the time period required for flower development and the number of flowers produced was lowest under the constant low temperature regime. The number of flowers produced under the two partial heating regimes was similar to the constant high temperature in 3 of the cultivars examined. Alternating the temperature every 2 hr stimulated the flower production of ‘Golden Times’. Under this regime, 28% more flowers were produced in comparison to a constant temperature of 18°.
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