Articles
SHORT-DAY PERIOD AND TEMPERATURE INTERACTIONS ON GROWTH AND FLOWERING OF STRAWBERRY
Article number
439_101
Pages
609 – 616
Language
Abstract
‘Korona’, ‘Elsanta’, ‘Bounty’ and ‘Senga Sengana’ strawberry (Fragaria x ananassa Duch.) plants, were placed at constant temperatures of 9, 15 and 21°C and daylenghts of 8 and 24 hours.
The plants were given different number of inductive cycles, and flowering and growth were studied.
At 4, 8, 16, 24 and 32 number of inductive cycles, respectively 17%, 10%, 42%, 57% and 68% of the plants induced flowering.
At 24 hr daylength 13% of the plants induced flowering.
At 9, 15 and 21°C, respectively 21%, 45% and 37% of the plants induced flowering.
For ‘Korona’ and ‘Elsanta’ the lowest number of short day (SD) cycles required for flower induction at 9°C was 24 and 32, respectively.
At 15°C 16 SD cycles was required, and at 21°C 16 and 24 SD cycles induced flowering.
At 9°C and 15°C ‘Bounty’ induced flowering also in continuous light, but at 21°C 16 SD cycles was required.
At 9°C ‘Senga Sengana’ required 4 SD cycles for flower induction, but induced flowering also in continuous light at 15°C and 21°C. Some of these results may perhaps be in response to some unrecognized stress arising from the treatment.
Runner production was stimulated by high temperatures and few SD cycles, with optima at 4 SD cycles and 21°C. At continuous light (0 SD cycles) the number of stolons were between that of 16 SD and 24 SD cycles.
The experiment will be repeated in 1996.
The plants were given different number of inductive cycles, and flowering and growth were studied.
At 4, 8, 16, 24 and 32 number of inductive cycles, respectively 17%, 10%, 42%, 57% and 68% of the plants induced flowering.
At 24 hr daylength 13% of the plants induced flowering.
At 9, 15 and 21°C, respectively 21%, 45% and 37% of the plants induced flowering.
For ‘Korona’ and ‘Elsanta’ the lowest number of short day (SD) cycles required for flower induction at 9°C was 24 and 32, respectively.
At 15°C 16 SD cycles was required, and at 21°C 16 and 24 SD cycles induced flowering.
At 9°C and 15°C ‘Bounty’ induced flowering also in continuous light, but at 21°C 16 SD cycles was required.
At 9°C ‘Senga Sengana’ required 4 SD cycles for flower induction, but induced flowering also in continuous light at 15°C and 21°C. Some of these results may perhaps be in response to some unrecognized stress arising from the treatment.
Runner production was stimulated by high temperatures and few SD cycles, with optima at 4 SD cycles and 21°C. At continuous light (0 SD cycles) the number of stolons were between that of 16 SD and 24 SD cycles.
The experiment will be repeated in 1996.
Publication
Authors
A. Sønsteby
Keywords
Fragaria x ananassa, controlled environment, flowering, flower induction, induction cycles, long day, temperature
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