S-Space College of Agriculture and Life Sciences (농업생명과학대학) Dept. of Plant Science (식물생산과학부) Theses (Master's Degree_식물생산과학부)
CO2 Uptake Behavior and Vegetative Growth of Doritaenopsis Mantefon Orchids as Influenced by Light/Dark Cycle Manipulation
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- 농업생명과학대학 식물생산과학부
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- 서울대학교 대학원
- CAM plants ; Circadian rhythms ; Orchid ; vegetative growth
- 학위논문 (석사)-- 서울대학교 대학원 농업생명과학대학 식물생산과학부, 2017. 8. 김기선.
- This study was performed to investigate how changing the period of light and dark influences the vegetation growth and the photosynthesis of Doritaenopsis. Clones of Doritaenopsis Queen Beer Mantefon at 4-month-old stage were grown in a closed-plant factory system with four different light/dark cycles
06/06 h, 08/08 h, 10/10 h, and 12/12 h. Temperature and relative humidity were set at 28oC and 80%, respectively, with a photosynthetic photon flux density of 160 ± 10 µmol·m-2·s-1. Repetitive measurements showed that the leaf length and the leaf width were the longest under 12/12 h closely followed by 10/10 h. The fresh weight and the dry weight of leaves and roots were the heaviest at 10/10 h treated samples. Different CO2 uptake patterns were observed from different light/dark cycles. Under 10/10 h and 12/12 h treatments, the CO2 uptake started at early dark period. When the light/dark cycles were shortened to 06/06 h and 08/08 h, the CO2 uptake started at the middle of dark period. Total CO2 uptake amounts were the highest under 12/12 h treatment followed by 10/10 h, 06/06 h, and 08/08 h treatments. Quantitative measurements showed that the vegetative growths under 10/10 h treatment were comparable with that of 12/12 h treatment. These studies indicated that manipulating light/dark can modify the photosynthesis patterns and vegetative growth of Doritaenopsis Mantefon, resulting in the reduction of the production period.
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