Abstract
Light is one of the most important environmental factors for plant growth and development. The purpose of this study is to investigate the effects of light quality on seedling growth, chlorophyll pigment content, anti-oxidant systems, chlorophyll fluorescence parameters, photosynthetic efficiency, biological production and active ingredient of polysaccharide accumulation of D. officinale. The results showed that the effects of different light qualities on the growth and development, photosynthetic pigment and chlorophyll fluorescence parameters of D. officinale seedlings were extremely different. Blue light (BL) promoted stem diameter, chlorophyll a, chlorophyll b, and total chlorophyll content. Red light (RL) increased seedling height, relative water content, non photochemical quenching (NPQ), chlorophyll a/b, relative electrolyte conductivity (REC) and extract content; while mixtures of blue and red lights (RBL) accelerated significantly seedling height, malondialdehyde (MDA), superoxide dismutase (SOD), peroxidase (POD), catalase (CAT), maximum quantum yield (Fv/Fm), photochemical quenching (qP), electron transport rate (ETR) and polysaccharide content. Therefore, it was thought that RBL can improve seedling growth and development through enhancing photosynthetic pigment synthesis, antioxidant enzymes activities, PSII system energy conversion and utilization efficiency, and thus delaying leaf senescence to ensure vigorous growth. These results could play an important role in seedling cultivation of D. officinale.
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Abbreviations
- BL:
-
blue light
- RL:
-
red light
- RBL:
-
mixtures of blue plus red lights
- Chi:
-
chlorophyll
- MDA:
-
malondialdehyde
- REC:
-
relative electrolyte conductivity
- RWC:
-
relative water content
- SOD:
-
superoxide dismutase
- POD:
-
peroxidase
- CAT:
-
catalase
- NPQ:
-
non photochemical quenching
- Fv/Fm:
-
maximum quantum yield
- qP:
-
photochemical quenching
- ETR:
-
electron transport rate
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Wang, Y., Tong, Y., Chu, H. et al. Effects of different light qualities on seedling growth and chlorophyll fluorescence parameters of Dendrobium officinale. Biologia 72, 735–744 (2017). https://doi.org/10.1515/biolog-2017-0081
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DOI: https://doi.org/10.1515/biolog-2017-0081