Abstract
LED lamps with various combinations of red (R) and blue (B) wavelengths were used to supplement sunlight for the growth of a heat-resistant (HR) and heat-sensitive (HS) recombinant inbred lines (RIL) of lettuce. The RB-LED ratios were 100R:0B (0B), 92R:8B (8B), 84R:16B (16B), and 76R:24B (24B) with an equal PPFD of 100 μmol m−2 s−1. The greatest leaf expansion rates were observed at 8B for both genotypes. All HR-RILs had similar values of growth parameters and specific leaf area (SLA). However, higher values of growth parameters were observed in HS-RIL with 0B, 8B, and 16B than that under 24B and sunlight. Furthermore, HS-RIL had higher SLA under 0B compared to other conditions. Photosynthetic light-use efficiency and maximal oxygen evolution rate were the lowest under 8B for both genotypes. The quality of LED lighting, if provided, seemed to implicate genotype dependence, probably as a result of their different sensitivities to heat stress.
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Abbreviations
- B:
-
blue
- Car:
-
carotenoids
- Chl:
-
chlorophyll
- DM:
-
dry mass
- ETR:
-
electron transport rate
- FM:
-
fresh mass
- HR:
-
heat-resistant
- HS:
-
heat-sensitive
- LED:
-
light emitting diode
- NPQ:
-
nonphotochemical quenching
- P Nmax :
-
light- and CO2-saturated net photosynthetic rate
- qp:
-
photochemical quenching
- R:
-
red
- RIL:
-
recombinant inbred lines
- SD:
-
stomatal density
- SL:
-
sunlight
- SLA:
-
specific leaf area
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Acknowledgements: This project was funded by Singapore Millennium Foundation, Singapore (SMF-Farming System), and Monetary Academic Resources for Research, Nanyang Technological University, Singapore. We thank the Michelmore Lab at the UC Davis Genome Centre for providing us with the RIL seeds.
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Choong, T.W., He, J., Qin, L. et al. Quality of supplementary LED lighting effects on growth and photosynthesis of two different Lactuca recombinant inbred lines (RILs) grown in a tropical greenhouse. Photosynthetica 56, 1278–1286 (2018). https://doi.org/10.1007/s11099-018-0828-2
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DOI: https://doi.org/10.1007/s11099-018-0828-2