Articles
ALTERNATING TEMPERATURE AFFECTS SPIKING OF A HYBRID PHALAENOPSIS
Article number
766_40
Pages
307 – 314
Language
English
Abstract
Vegetatively propagated plants of a Phalaenopsis Taisuco Swan clone were exposed to day/night temperatures of 25/20 or 20/15°C for 1, 2, or 3 weeks and then moved to and stayed at 20/15 or 25/20°C, respectively.
Although the average time required for spiking did not vary (40-43 days), increased initial exposure to 25/20°C from 1 to 3 weeks resulted in increasingly wider range of the spiking period, 34-49, 33-53, and 22-55 days, respectively.
Plants that were first exposed to 20/15°C for 1, 2, or 3 weeks and then moved to 25/20°C all spiked similarly (30-34 days). Plants kept under constant 25/20 or 20/15°C required 31 and 49 days, respectively, to reach spiking.
Additional plants were exposed to 25/20 or 20/25°C for 1, 2, 3, or 4 weeks, before being placed in a constant 30°C for 1 week, and then returned to their respective temperature conditions.
As time of exposure to 25/20°C increased from 1 to 3 weeks before 1 week of 30°C, there was a trend of delayed spiking (48, 51, and 54 days, respectively) as opposed to needing only 31 days to reach spiking under constant 25/20°C. However, 4 weeks at 25/20°C before 1 week of 30°C accelerated spiking (40 days). Plants exposed to 20/15°C for 1 to 3 weeks before 30°C all spiked similarly (56-60 days). However, 4 weeks at 20/15°C before 1 week of 30°C resulted in delayed spiking (68 days). All of these plants needed more time to reach spiking than those kept constantly at 20/15°C (49 days). Leaf sucrose concentration (mg cm-2) at 2 weeks after returning to 25/20 or 20/15°C following 1 week at 30°C was inversely related to the length of time needed for spiking.
The results of this study clearly show that exposure to 25/20°C accelerated spiking by 7 to 14 days when compared to 20/15°C, regardless of the sequence of exposure.
Exposing to 30°C for one week after 1 to 4 weeks of cooling, regardless of the day/night temperature, effectively delayed spiking by up to three weeks.
Although the average time required for spiking did not vary (40-43 days), increased initial exposure to 25/20°C from 1 to 3 weeks resulted in increasingly wider range of the spiking period, 34-49, 33-53, and 22-55 days, respectively.
Plants that were first exposed to 20/15°C for 1, 2, or 3 weeks and then moved to 25/20°C all spiked similarly (30-34 days). Plants kept under constant 25/20 or 20/15°C required 31 and 49 days, respectively, to reach spiking.
Additional plants were exposed to 25/20 or 20/25°C for 1, 2, 3, or 4 weeks, before being placed in a constant 30°C for 1 week, and then returned to their respective temperature conditions.
As time of exposure to 25/20°C increased from 1 to 3 weeks before 1 week of 30°C, there was a trend of delayed spiking (48, 51, and 54 days, respectively) as opposed to needing only 31 days to reach spiking under constant 25/20°C. However, 4 weeks at 25/20°C before 1 week of 30°C accelerated spiking (40 days). Plants exposed to 20/15°C for 1 to 3 weeks before 30°C all spiked similarly (56-60 days). However, 4 weeks at 20/15°C before 1 week of 30°C resulted in delayed spiking (68 days). All of these plants needed more time to reach spiking than those kept constantly at 20/15°C (49 days). Leaf sucrose concentration (mg cm-2) at 2 weeks after returning to 25/20 or 20/15°C following 1 week at 30°C was inversely related to the length of time needed for spiking.
The results of this study clearly show that exposure to 25/20°C accelerated spiking by 7 to 14 days when compared to 20/15°C, regardless of the sequence of exposure.
Exposing to 30°C for one week after 1 to 4 weeks of cooling, regardless of the day/night temperature, effectively delayed spiking by up to three weeks.
Publication
Authors
Wei-Ting Tsai , Yin-Tung Wang, Huey-Ling Lin
Keywords
Phalaenopsis, temperature, flower induction, moth orchid
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