2021 Volume 20 Issue 1 Pages 95-100
The effect of day and night temperature on translocation and distribution of 13C-photosynthetic assimilates was investigated for clarifying fruit growth and ripening. The translocation rate in the daytime was significantly higher than twice that in the nighttime, and the effect of day temperature on translocation and fruit growth was greater than that of the night temperature. 13C-photosynthetic assimilates was most distributed to new leaves in the flowering stage, whereas the distribution rate to fruit was more than 90% at the high day-temperature and 70% at the low day-temperature in the white ripening stage (32 days after flowering). The dry weight of fruit in the white ripening stage was significantly heavier at the high day-temperature than at the low day-temperature, suggesting that the high temperature in the daytime promoted fruit development. The ripening days of top fruit at the secondary inflorescence were longer at the low day-temperature than at the high day-temperature, but the days were not affected by the night temperature. Furthermore, the effect of day temperature on the ripening days was greater than that of the daily average temperature. From the above results, it was clarified that increasing the day temperature in the greenhouse during a severe cold season promotes the translocation and ripening of strawberry fruit. It could be used as one of the means to control the growth of strawberry.
