Vol. 34 No. 4 (2020): Advances in Horticultural Science
Articles

Growth and chlorophyll fluorescence characteristics of Sinningia speciosa under red, blue and white light-emitting diodes and sunlight

M. Moazzeni
Department of Horticulture Science, Agriculture Faculty of Shahrekord University, P.O. Box 8818634141 Shahrekord
S. Reezi
Department of Horticultural Science, Agriculture Faculty of Shahrekord University, P.O. Box 8818634141 Shahrekord
M. Ghasemi Ghehsareh
Department of Horticulture Science, Agriculture Faculty of Shahrekord University, P.O. Box 8818634141 Shahrekord
Published October 26, 2020
Keywords
  • Greenhouse,
  • growth chamber,
  • light-emitting diodes,
  • light spectra,
  • transplant production
How to Cite
Moazzeni, M., Reezi, S., & Ghasemi Ghehsareh, M. (2020). Growth and chlorophyll fluorescence characteristics of Sinningia speciosa under red, blue and white light-emitting diodes and sunlight. Advances in Horticultural Science, 34(4), 419-430. https://doi.org/10.13128/ahsc-8966

Abstract

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.

 

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