fpls-08-00190.pdf - ORIGINAL RESEARCH published 17 February...

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ORIGINAL RESEARCH published: 17 February 2017 doi: 10.3389/fpls.2017.00190 Frontiers in Plant Science | 1 February 2017 | Volume 8 | Article 190 Editedby: MarcelloMastrorilli, ConsiglioperlaRicercainAgricoltura el’Analisidell’EconomiaAgraria (CREA),Italy Reviewedby: GerhardBuck-Sorlin, AgrocampusOuest,France YoussefRouphael, UniversityofNaplesFedericoII,Italy *Correspondence: RoelC.Rabara [email protected] PresentAddress: RoelC.Rabara, NewMexicoConsortium,LosAlamos, NM,USA ThomasTimbol, UniversityofDallas,Irving,TX,USA PaulJ.Rushton, 22ndCenturyGroupInc.,Clarence, NY,USA Specialtysection: Thisarticlewassubmittedto CropScienceandHorticulture, asectionofthejournal FrontiersinPlantScience Received: 09September2016 Accepted: 30January2017 Published: 17February2017 Citation: RabaraRC,BehrmanG,TimbolTand RushtonPJ(2017)EffectofSpectral QualityofMonochromaticLEDLights ontheGrowthofArtichokeSeedlings. Front.PlantSci.8:190. doi:10.3389/fpls.2017.00190 Effect of Spectral Quality of Monochromatic LED Lights on the Growth of Artichoke Seedlings RoelC.Rabara 1 * ,GlennBehrman 2 ,ThomasTimbol 1† andPaulJ.Rushton 1† 1 TexasA&MAgriLifeResearchandExtensionCenter,Dallas,TX,USA, 2 CEAAdvisorsLLC,Dallas,TX,USA Indoor farming is becoming a popular alternative approach in food production to meet the demand of a growing world population. Under this production system, artificial light provides the main source of illumination in sustaining plant growth and development. The use of light-emitting diodes (LEDs) is a popular source of artificial light for indoor farms due to its narrow light spectra, modular design and energy efficiency. This study purposely assessed the effect of monochromatic LED light quality on the growth of three varieties of artichoke seedlings compared to greenhouse condition. Spectral quality assessment showed that photosynthetic photon flux density (PPFD) was highest under red LED light, but only a third of the total PPFD under natural light. Seedlings grown under red light showed 60–100% more shoot dry weight and were 67–115% taller than seedlings grown in the greenhouse. However, seedlings under blue or white light conditions showed 67–76% less in biomass compared to greenhouse-grown seedlings. Overall, plant response of seedlings under red light condition was much better compared to greenhouse-grown seedlings emphasizing the importance of red light spectral quality in plant growth and development. Keywords: light-emitting diodes, LED, spectral quality, photosynthetic photon flux density, artichokes, indoor farming, urban agriculture INTRODUCTION The world population is estimated to reach the nine-billion mark by 2050 of which 66% will be living in urban areas ( UN, 2014 ). This growth in population means that a 70–100% increase in food production is needed to feed the growing world population ( Godfray et al., 2010 ). One option to increase food production is through urban agriculture. This type of agriculture could also take the pressure off rural agriculture and decompensate land loss ( Eigenbrod and Gruda, 2015 ). In
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