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    2019, Vol. 18 Issue (01): 62-69     DOI: 10.1016/S2095-3119(18)62130-6
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Overhead supplemental far-red light stimulates tomato growth under intra-canopy lighting with LEDs
ZHANG Ya-ting, ZHANG Yu-qi, YANG Qi-chang, LI Tao
Key Laboratory of Energy Conservation and Waste Management of Agricultural Structures, Ministry of Agriculture and Rural Affairs/Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agriculture Sciences, Beijing 100081, P.R.China
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Far-red (FR) light regulates phytochrome-mediated morphological and physiological plant responses.  This study aims to investigate how greenhouse tomato morphology and production response to different durations of FR light during daytime and at the end of day (EOD).  High-wire tomato plants were grown under intra-canopy lighting consisting of red (peak wavelength at 640 nm) and blue (peak wavelength at 450 nm) light-emitting diodes (LEDs) with photosynthetic photon flux density (PPFD) of 144 μmol m–2 s–1 at 10 cm away from the lamps, and combined with overhead supplemental FR light (peak wavelength at 735 nm) with PPFD of 43 μmol m–2 s–1 at 20 cm below the lamps.  Plants were exposed to three durations of FR supplemental lighting including: 06:00–18:00 (FR12), 18:00–19:30 (EOD-FR1.5), 18:00–18:30 (EOD-FR0.5), and control that without supplemental FR light.  The results showed that supplemental FR light significantly stimulated stem elongation thereby resulting in longer plants compared with the control.  Moreover, FR light altered leaf morphology toward higher leaf length/width ratio and larger leaf area.  The altered plant architecture in FR supplemented plants led to a more homogeneous light distribution inside the canopy.  Total plant biomass was increased by 9–16% under supplemental FR light in comparison with control, which led to 7–12% increase in ripe fruit yield.  Soluble sugar content of the ripe tomato fruit was slightly decreased by longer exposure of the plants to FR light.  Dry matter partitioning to different plant organs were not substantially affected by the FR light treatments.  No significant differences were observed among the three FR light treatments in plant morphology as well as yield and biomass production.  We conclude that under intra-canopy lighting, overhead supplemental FR light stimulates tomato growth and production.  And supplementary of EOD-FR0.5 is more favorable, as it consumes less electricity but induces similar effects on plant morphology and yield.
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ZHANG Ya-ting
YANG Qi-chang
LI Tao
Key words Solanum lycopersicum     far-red light     LEDs     intro-canopy lighting     morphology     yield     
Received: 2018-01-11; Accepted: 2018-05-07
Fund: This work was supported by the National Key Research and Development Program of China (2017YFB0403902) and the Young Elite Scientists Sponsorship Program by the China Association for Science and Technology (CAST, 2016QNRC001).
Corresponding Authors: Correspondence LI Tao, Tel: +86-10-82105983, E-mail: litao06@caas.cn    
About author: ZHANG Ya-ting, E-mail: zhangyating1993@gmail.com;
Cite this article:   
ZHANG Ya-ting, ZHANG Yu-qi, YANG Qi-chang, LI Tao. 2019. Overhead supplemental far-red light stimulates tomato growth under intra-canopy lighting with LEDs. Journal of Integrative Agriculture, 18(01): 62-69.
http://www.chinaagrisci.com/Jwk_zgnykxen/EN/ 10.1016/S2095-3119(18)62130-6      or     http://www.chinaagrisci.com/Jwk_zgnykxen/EN/Y2019/V18/I01/62
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[1] . [J]. Journal of Integrative Agriculture, 2019, 18(03): 0-.
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