Effect of light qualities on photosynthetic electron transport chain in chrysanthemum leaves (original) (raw)
Light is one of the most important environmental factors that can affect plant growth and development. Previous studies indicated that plants under different light qualities exhibit different photosynthetic characteristics. However, there is limited study underlying related photosynthetic electron transport under different light qualities. To unravel the effects of light quality on photosynthetic electron transport chain, chrysanthemum (Chrysanthemum morifolium) plants were grown under four different light qualities including white (400-730 nm), blue monochromatic light (450 nm), red monochromatic light (635-665 nm) and a combination of red and blue (R:B=70:30), with the same photosynthetic photon flux density (PPFD) (250 µmol m-2 s-1). The results showed that using monochromatic light during growth of chrysanthemum led to some defects on electron transport chain, while using full visible spectrum (white light) or combination of red and blue lights resulted in normal performance of electron transport chain. Between monochromatic lights, using red light significantly increased dissipated energy flux, absorption and energy trapping fluxes per reaction center when compared with other light treatments. On the other hand, red light caused a significant decrease in the performance index for energy conservation, maximal quantum yield of primary photochemistry, quantum yield of electron transport and maximum quantum yield of photosystem II than other light treatments. Maximal quantum yield of primary photochemistry in monochromatic lights was considerably decreased when compared to white or RB lights. In conclusion, monochromatic lights can decrease efficiency of electron transport chain in the photosynthetic apparatus of the chrysanthemum plants.
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