Limits...
Growth and stress response in Arabidopsis thaliana, Nicotiana benthamiana, Glycine max, Solanum tuberosum and Brassica napus cultivated under polychromatic LEDs.

Janda M, Navrátil O, Haisel D, Jindřichová B, Fousek J, Burketová L, Čeřovská N, Moravec T - Plant Methods (2015)

Bottom Line: Among these are that LEDs have predicted lifetimes from 50-100.000 hours without significant drops in efficiency and energy consumption is much lower compared to traditional fluorescent tubes.The LED system was characterized and compared with standard fluorescence tubes in the same cultivation room.Interestingly, individual plant species responded differently to the LED lights so it would be reasonable to test their utility to any particular application.

View Article: PubMed Central - PubMed

Affiliation: Laboratory of Pathological Plant Physiology, Institute of Experimental Botany AS CR, Rozvojová 313, 165 02 Prague 6, Czech Republic ; Department of Biochemistry and Microbiology, University of Chemistry and Technology Prague, Technická 5, 166 28 Prague 6, Czech Republic.

ABSTRACT

Background: The use of light emitting diodes (LEDs) brings several key advantages over existing illumination technologies for indoor plant cultivation. Among these are that LEDs have predicted lifetimes from 50-100.000 hours without significant drops in efficiency and energy consumption is much lower compared to traditional fluorescent tubes. Recent advances allow LEDs to be used with customized wavelengths for plant growth. However, most of these LED growth systems use mixtures of chips emitting in several narrow wavelengths and frequently they are not compatible with existing infrastructures. This study tested the growth of five different plant species under phosphor coated LED-chips fitted into a tube with a standard G13 base that provide continuous visible light illumination with enhanced blue and red light.

Results: The LED system was characterized and compared with standard fluorescence tubes in the same cultivation room. Significant differences in heat generation between LEDs and fluorescent tubes were clearly demonstrated. Also, LED lights allowed for better control and stability of preset conditions. Physiological properties such as growth characteristics, biomass, and chlorophyll content were measured and the responses to pathogen assessed for five plant species (both the model plants Arabidopsis thaliana, Nicotiana bentamiana and crop species potato, oilseed rape and soybean) under the different illumination sources.

Conclusions: We showed that polychromatic LEDs provide light of sufficient quality and intensity for plant growth using less than 40% of the electricity required by the standard fluorescent lighting under test. The tested type of LED installation provides a simple upgrade pathway for existing infrastructure for indoor plant growth. Interestingly, individual plant species responded differently to the LED lights so it would be reasonable to test their utility to any particular application.

No MeSH data available.


Related in: MedlinePlus

Conditions characteristics A) Spectral composition of visible light produced by the illumination sources used in this study. The graph is based on data provided by manufacturers and normalized to the same total visible light output. B) and C) show PAR intensity measured in both axes of the shelf at a distance of 40 cm from the light source. Data points from one of the three technical replicates are shown. The datapoints represent the average from three measurements. Standard deviations were within 2% of measured values. D) Total water consumption after one month of the different plant species. A. thaliana tray contains 24 pots/plants with jiffy tablets. It was made in three biological replicates. Error bars represent SD. Asterisks indicate statistically significant differences compared to plants grown under fluorescent lights (** P < 0.01, two tailed Student’s t-test).
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
getmorefigures.php?uid=PMC4940826&req=5

Fig1: Conditions characteristics A) Spectral composition of visible light produced by the illumination sources used in this study. The graph is based on data provided by manufacturers and normalized to the same total visible light output. B) and C) show PAR intensity measured in both axes of the shelf at a distance of 40 cm from the light source. Data points from one of the three technical replicates are shown. The datapoints represent the average from three measurements. Standard deviations were within 2% of measured values. D) Total water consumption after one month of the different plant species. A. thaliana tray contains 24 pots/plants with jiffy tablets. It was made in three biological replicates. Error bars represent SD. Asterisks indicate statistically significant differences compared to plants grown under fluorescent lights (** P < 0.01, two tailed Student’s t-test).

Mentions: The spectral characteristics of both fluorescent and LED lights are depicted in Figure 1A. Fluorescent tubes emit light of several narrow bands, the prominent being 405 nm, 435 nm, 490 nm, 545 nm, 585 nm, 615 nm and 710 nm, while the GrowLED lights provide a full continuous spectrum with enhanced emission peaks around 445 nm and 660 nm. The photon flux density (PFD) of fluorescent tubes had a blue:green:red ratio (defined as 400–500 nm for blue, 501–599 nm for green and 600–700 for red, see also [21]) with a ratio of 16.1: 45.4: 38.5 while the same ratio for the LED tubes was 19.1:19.8:61.1. The LED tubes thus emitted a much higher proportion of red light and substantially less green light, while the amount of blue wavelengths was similar for both sources. Interestingly, the LEDs provided only very little of far-red light, the red:far-red ratio being only 61:1, while the same ratio for fluorescent lamps was 8.5:1.Figure 1


Growth and stress response in Arabidopsis thaliana, Nicotiana benthamiana, Glycine max, Solanum tuberosum and Brassica napus cultivated under polychromatic LEDs.

Janda M, Navrátil O, Haisel D, Jindřichová B, Fousek J, Burketová L, Čeřovská N, Moravec T - Plant Methods (2015)

Conditions characteristics A) Spectral composition of visible light produced by the illumination sources used in this study. The graph is based on data provided by manufacturers and normalized to the same total visible light output. B) and C) show PAR intensity measured in both axes of the shelf at a distance of 40 cm from the light source. Data points from one of the three technical replicates are shown. The datapoints represent the average from three measurements. Standard deviations were within 2% of measured values. D) Total water consumption after one month of the different plant species. A. thaliana tray contains 24 pots/plants with jiffy tablets. It was made in three biological replicates. Error bars represent SD. Asterisks indicate statistically significant differences compared to plants grown under fluorescent lights (** P < 0.01, two tailed Student’s t-test).
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4940826&req=5

Fig1: Conditions characteristics A) Spectral composition of visible light produced by the illumination sources used in this study. The graph is based on data provided by manufacturers and normalized to the same total visible light output. B) and C) show PAR intensity measured in both axes of the shelf at a distance of 40 cm from the light source. Data points from one of the three technical replicates are shown. The datapoints represent the average from three measurements. Standard deviations were within 2% of measured values. D) Total water consumption after one month of the different plant species. A. thaliana tray contains 24 pots/plants with jiffy tablets. It was made in three biological replicates. Error bars represent SD. Asterisks indicate statistically significant differences compared to plants grown under fluorescent lights (** P < 0.01, two tailed Student’s t-test).
Mentions: The spectral characteristics of both fluorescent and LED lights are depicted in Figure 1A. Fluorescent tubes emit light of several narrow bands, the prominent being 405 nm, 435 nm, 490 nm, 545 nm, 585 nm, 615 nm and 710 nm, while the GrowLED lights provide a full continuous spectrum with enhanced emission peaks around 445 nm and 660 nm. The photon flux density (PFD) of fluorescent tubes had a blue:green:red ratio (defined as 400–500 nm for blue, 501–599 nm for green and 600–700 for red, see also [21]) with a ratio of 16.1: 45.4: 38.5 while the same ratio for the LED tubes was 19.1:19.8:61.1. The LED tubes thus emitted a much higher proportion of red light and substantially less green light, while the amount of blue wavelengths was similar for both sources. Interestingly, the LEDs provided only very little of far-red light, the red:far-red ratio being only 61:1, while the same ratio for fluorescent lamps was 8.5:1.Figure 1

Bottom Line: Among these are that LEDs have predicted lifetimes from 50-100.000 hours without significant drops in efficiency and energy consumption is much lower compared to traditional fluorescent tubes.The LED system was characterized and compared with standard fluorescence tubes in the same cultivation room.Interestingly, individual plant species responded differently to the LED lights so it would be reasonable to test their utility to any particular application.

View Article: PubMed Central - PubMed

Affiliation: Laboratory of Pathological Plant Physiology, Institute of Experimental Botany AS CR, Rozvojová 313, 165 02 Prague 6, Czech Republic ; Department of Biochemistry and Microbiology, University of Chemistry and Technology Prague, Technická 5, 166 28 Prague 6, Czech Republic.

ABSTRACT

Background: The use of light emitting diodes (LEDs) brings several key advantages over existing illumination technologies for indoor plant cultivation. Among these are that LEDs have predicted lifetimes from 50-100.000 hours without significant drops in efficiency and energy consumption is much lower compared to traditional fluorescent tubes. Recent advances allow LEDs to be used with customized wavelengths for plant growth. However, most of these LED growth systems use mixtures of chips emitting in several narrow wavelengths and frequently they are not compatible with existing infrastructures. This study tested the growth of five different plant species under phosphor coated LED-chips fitted into a tube with a standard G13 base that provide continuous visible light illumination with enhanced blue and red light.

Results: The LED system was characterized and compared with standard fluorescence tubes in the same cultivation room. Significant differences in heat generation between LEDs and fluorescent tubes were clearly demonstrated. Also, LED lights allowed for better control and stability of preset conditions. Physiological properties such as growth characteristics, biomass, and chlorophyll content were measured and the responses to pathogen assessed for five plant species (both the model plants Arabidopsis thaliana, Nicotiana bentamiana and crop species potato, oilseed rape and soybean) under the different illumination sources.

Conclusions: We showed that polychromatic LEDs provide light of sufficient quality and intensity for plant growth using less than 40% of the electricity required by the standard fluorescent lighting under test. The tested type of LED installation provides a simple upgrade pathway for existing infrastructure for indoor plant growth. Interestingly, individual plant species responded differently to the LED lights so it would be reasonable to test their utility to any particular application.

No MeSH data available.


Related in: MedlinePlus