|
KMID : 0903620000410020221
|
|
Journal of the Korean Society for Horticultural Science
2000 Volume.41 No. 2 p.221 ~ p.225
|
|
|
Effects of Different Photosynthetic Photon Flux Density (PPFD) and Temperatures on Photosynthesis and Carbohydrate Content in Doritaenopsis ´ Happy ´ Valentine
|
|
|
|
|
Abstract
|
|
|
|
This study was carried out to investigate the effects of different photosynthetic photon flux density (PPFD) and day/night temperatures on photosynthesis and carbohydrate content of Doritaenopsis ´Happy Valentine´. Chlorophyll content was lower at low temperature (day 15℃/night 10℃) and high light intensity (150 μmol·m^(-2)·s^(-1)), and was reached the maximum at day 25℃/night 20℃. Photosynthesis achieved the highest at PPFD 100 μmol·m^(-2)·s^(-1) and day 25℃/night 20℃, and decreased at 50 μmol·m^(-2)·s^(-1). In addition, changes of stomatal conductance and transpiration were similiar to that of photosynthesis. On the contrary, intercellular CO₂ concentration increased at low light intensity 50 μmol·m^(-2)·s^(-1) . CO₂ uptake showed typical CAM type photosynthesis form that absorbed most at night with 100 μmol·m^(-2)·s^(-1) and emitted most at day, and it was apt to absorb some CO₂ at day with 150 μmol·m^(-2)·s^(-1). Sugar and starch contents increased at the temperature day 25℃/night 20℃, but decreased at high temperature and light intensity.
|
|
|
KEYWORD
|
|
|
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
|
|