Growth and chlorophyll fluorescence characteristics of Sinningia speciosa under red, blue and white light-emitting diodes and sunlight
- growth chamber,
- light-emitting diodes,
- light spectra,
- transplant production
Copyright (c) 2020 Mohammad Moazzeni, Saeed Reezi, Masoud Ghasemi Ghehsareh
This work is licensed under a Creative Commons Attribution 4.0 International License.
Determining the most reasonable LED spectral composition wavelengths on Sinningia speciosa transplants was the main focus of present experiment. Seeds were sown in cell trays under chambers with distinct spectral composition including white+blue+red (WBR), blue+red (BR) and white+red (WR) LEDs with equal light quality proportions (70 µmol m-2 s-1 photon ﬂux density) and under sunlight (400 µmol m-2 s-1 photon ﬂux density) in constant conditions of 14h photoperiod, 70% relative humidity and day/night temperature of 23/18°C for 50 days. In this stage, LED treatments led to higher germination percentage and better results in biomass, canopy width, leaf width and leaf area as well as chlorophyll and carotenoids accumulation were obtained in comparison with sunlight. Extracted and technical parameters of chlorophyll ﬂuorescence induction kinetics and maximum quantum eﬃciency of photosystem II (Fv/Fm) were decreased by sunlightgrown seedlings. Fv/Fm was induced by WBR and BR treatments, correlated with maximum yield of primary photochemistry (jP0). Quantum eﬃciencies (jP0, jE0 and y0) and performance index of absorption energy ﬂux (PIABS) were increased in BRexposed transplants. In pot stage, LED-treated plants exhibited better results in morphological features with earlier marketable ﬂowering stage especially under WBR, which can compensate costs of production in marketing stage.