Promotion of flowering by photoperiod treatment in six strawberry (Fragaria × ananassa Duch.) cultivars with different everbearing Patterns
2015
Hamano, M. | Kato, K. | Honda, K. | Maeda, T. | Morishita, M.
The effects of different photoperiod treatments (12, 16, 20, or 24 h) and their duration (1, 2, 3, or 4 weeks) on the percentage of flowering plants and the number of inflorescences were investigated in the Summer in everbearing (EB) strawberry (Fragaria _ ananassa Duch.) cultivars with various EB strengths in a field in northern Japan. For ‘Tochihitomi’, a strong EB cultivar, inflorescences emerged in all control plants grown under the natural photoperiod (14.5 h), and the number of inflorescences was not affected by any photoperiod treatment. In cultivars of intermediate EB strength (i.e., ‘Summer-drop’, ‘Summer-tiara’, ‘Miyazaki-natsuharuka’, and ‘Summer-fairy’), flowering was < 100% under a 12-h photoperiod.The number of inflorescences was higher under the 24-h photoperiod than in control plants, with the effect of the duration of the photoperiod dependent on cultivar. For ‘Natsuakari’, a weak EB, 0 - 20% of plants flowered under the 12-h photoperiod, and 0% under the natural photoperiod. However, flower buds were induced in all plants treated with the 16-h or 20-h photoperiods for 2 weeks, or with the 24-h photoperiod for 1 week. Furthermore, the 16-h (2 weeks) and 20-h and 24-h (1 week) photoperiod treatments induced significantly more inflorescences than in control plants. Although the characteristics of flowering of EB strawberry plants differed between cultivars, we suggest that flowering can be promoted by a 24-h photoperiod applied for 1 - 4 weeks in cultivars of weak or intermediate EB strength.
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