Please use this identifier to cite or link to this item: http://hdl.handle.net/10497/18851
Title: Plant growth and photosynthetic characteristics of mesembryanthemum crystallinum grown aeroponically under different blue- and red-LEDs.
Authors: He, Jie
Qin, Lin
Chong, Emma L. C.
Choong, Tsui Wei
Lee, Sing Kong
Keywords: Aeroponics
LED lighting
Mesembryanthemum crystallinum
Photosynthesis
Plant growth
Issue Date: 2017
Citation: He, J., Qin, L., Chong, E. L. C., Choong, T. W., & Lee, S. K. (2017). Plant growth and photosynthetic characteristics of mesembryanthemum crystallinum grown aeroponically under different blue- and red-LEDs. Frontiers in Plant Science, 8:361, 1-13. http://dx.doi.org/10.3389/fpls.2017.00361
Abstract: Mesembryanthemum crystallinum is a succulent, facultative crassulacean acid metabolism (CAM) plant. Plant growth and photosynthetic characteristics were studied when M. crystallinum plants were grown indoor under light emitting diodes (LED)-lighting with adequate water supply. Plants were cultured aeroponically for a 16-h photoperiod at an equal photosynthetic photon flux density of 350 mmol mô€€€2 sô€€€1 under different red:blue LED ratios: (1) 100:0 (0B); (2) 90:10 (10B); (3) 80:20 (20B); (4) 70:30 (30B); (5) 50:50 (50B); and (6)100:0 (100B). M. crystallinum grown under 10B condition had the highest shoot and root biomass and shoot/root ratio while those grown under 0B condition exhibited the lowest values. Compared to plants grown under 0B condition, all other plants had similar but higher total chlorophyll (Chl) and carotenoids (Car) contents and higher Chl a/b ratios. However, there were no significant differences in Chl/Car ratio among all plants grown under different red- and blue-LEDs. Photosynthetic light use efficiency measured by photochemical quenching, non-photochemical quenching, and electron transport rate, demonstrated that plants grown under high blue-LED utilized more light energy and had more effective heat dissipation mechanism compared to plants grown under 0B or lower blue-LED. Statistically, there were no differences in photosynthetic O2 evolution rate, light-saturated CO2 assimilation rate (Asat), and lightsaturated stomatal conductance (gssat) among plants grown under different combined red- and blue-LEDs but they were significantly higher than those of 0B plants. No statistically differences in total reduced nitrogen content were found among all plants. For the total soluble protein, all plants grown under different combined red- and blue- LEDs had similar values but they were significantly higher than that of plants grown under 0B condition. However, plants grown under higher blue-LEDs had significant higher ribulose-1,5-bisphosphate carboxylase oxygenase (Rubisco) protein than those plants grown under lower blue-LED. High Asat and gssat but very low CAM acidity of all M. crystallinum plants during light period, imply that this facultative CAM plant performed C3 photosynthesis when supplied with adequate water. Results of this study suggest that compared to red- or blue-LED alone, appropriate combination of red- and blue-LED lighting enhanced plant growth and photosynthetic capacities of M. crystallinum.
URI: http://hdl.handle.net/10497/18851
ISSN: 1664-462X
Other Identifiers: 10.3389/fpls.2017.00361
Appears in Collections:Journal Articles

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