Articles
EFFECT OF TEMPERATURE AND PHOTOPERIOD ON THE DEVELOPMENT OF INFLORESCENCES IN EVERBEARING STRAWBERRY (FRAGARIA X ANANASSA DUCH.) PLANTS
Article number
514_31
Pages
261 – 267
Language
English
Abstract
Effects of temperature and photoperiod on vegetative and reproductive growth were investigated in everbearing strawberry (Fragaria x ananassa Duch. cv. ‘Summerberry’) plants.
At first, the plants were grown under 8- 24-hr photoperiods at day/night temperatures of 20/15°C 25/20°C and 30/25°C for 16 weeks.
At 20/15 and 25/20°C flowering continued under both photoperiods during the experiment although the number of inflorescences was larger under the 24-hr photoperiod.
At 30/25°C, inflorescence formation was stopped under the 80-hr treatment and remarkably promoted under the 24-hr photoperiod.
Vegetative growth was the most active at 20/15°C under the 24-hr photoperiod and it was seriously inhibited at 30/25°C by the 24-hr treatment.
Secondly, ‘Summerberry’ plants were grown at 30/25°C under 8-, 10-, 12-, 16-, 20- and 24-hr photoperiods.
Inflorescences of plants ceased to develop under 8 to 12-hr photoperiods.
On the contrary, the development of inflorescences was promoted under 16 to 24-hr photoperiods.
Vegetative growth was better under 8 to 12-hr compared with longer photoperiods.
Furthermore, the plants were grown at 30/25°C under 11-, 12-, 13-, 14-, 15- and 16-hr photoperiods.
Development of inflorescences was inhibited by 11 to 13-hr treatments and it was promoted under 14-hr and longer photoperiods.
These results indicate that a critical photoperiod for the development of inflorescences of ‘Summerberry’ plants exists between 13- and 14-hr.
Besides flowering behavior observed in the present study suggests that photoperiod affects on reproductive growth quantitatively.
At first, the plants were grown under 8- 24-hr photoperiods at day/night temperatures of 20/15°C 25/20°C and 30/25°C for 16 weeks.
At 20/15 and 25/20°C flowering continued under both photoperiods during the experiment although the number of inflorescences was larger under the 24-hr photoperiod.
At 30/25°C, inflorescence formation was stopped under the 80-hr treatment and remarkably promoted under the 24-hr photoperiod.
Vegetative growth was the most active at 20/15°C under the 24-hr photoperiod and it was seriously inhibited at 30/25°C by the 24-hr treatment.
Secondly, ‘Summerberry’ plants were grown at 30/25°C under 8-, 10-, 12-, 16-, 20- and 24-hr photoperiods.
Inflorescences of plants ceased to develop under 8 to 12-hr photoperiods.
On the contrary, the development of inflorescences was promoted under 16 to 24-hr photoperiods.
Vegetative growth was better under 8 to 12-hr compared with longer photoperiods.
Furthermore, the plants were grown at 30/25°C under 11-, 12-, 13-, 14-, 15- and 16-hr photoperiods.
Development of inflorescences was inhibited by 11 to 13-hr treatments and it was promoted under 14-hr and longer photoperiods.
These results indicate that a critical photoperiod for the development of inflorescences of ‘Summerberry’ plants exists between 13- and 14-hr.
Besides flowering behavior observed in the present study suggests that photoperiod affects on reproductive growth quantitatively.
Authors
M. Nishiyama, K. Kanahama
Keywords
everbearing strawberry, summerberry, temperature, photoperiod, inflorescence development, vegetative growth
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