Increasing Productivity of Sweet Pepper With Interlighting

Hovi-Pekkanen, Tiina; Näkkilä, Juha; Tahvonen, Risto

doi:10.17660/actahortic.2006.711.19

Cited by 30 publications

(20 citation statements)

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“…Inter-lighting, performed by putting lamps in the row in between the canopy, leads to higher light intensities in the lower part of the canopy. This has been successfully used in a number of vegetable crops (Hovi-Pekkanen et al, 2006;Hovi-Pekkanen and Tahvonen, 2008;Trouwborst et al, 2009). This lighting strategy irradiates both the adaxial (upper) and abaxial (lower) leaf sides.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Irradiating Adaxial or Abaxial Side on Photosynthesis of Rose Leaves

Paradiso¹,

Marcelis²

2012

Acta Hortic.

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In many cropping systems most of the light irradiates the adaxial side of leaves. However, in cropping systems with intra canopy lighting a reasonable fraction of light may irradiate even the abaxial side of the leaves. The aim of this study was to investigate the effect of irradiating the abaxial leaf side compared to irradiating the adaxial side, in rose plants grown in glasshouse with the bending technique. The instantaneous effects on the optical properties and the light response of photosynthesis were analysed in intact leaves. Results demonstrated that the rate of net photosynthesis was higher when leaves were lighted from the adaxial side compared to the abaxial side. This was the consequence of both a higher light absorption and higher quantum yield (photosynthesis per unit absorbed light) in adaxial-lighted leaves.

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Section: Introductionmentioning

confidence: 99%

The Effect of Irradiating Adaxial or Abaxial Side on Photosynthesis of Rose Leaves

Paradiso¹,

Marcelis²

2012

Acta Hortic.

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“…In IL, the light sources are placed between the plant stands to irradiate the lower leaves horizontally. Several previous studies have reported that IL increased fruit yields in high-wire grown vegetables compared to TL (Hovi et al, 2004;Gunnlaugsson and Adalsteinsson, 2006;Hovi-Pekkanen et al, 2006;Hovi-Pekkanen and Tahvonen, 2008;Pettersen et al, 2010).…”

Section: Introductionmentioning

confidence: 90%

Effects of supplemental lighting to a lower leaf using light-emitting diodes with different spectra on the leaf photosynthetic rate in sweet pepper

Murakami

Matsuda

Fujiwara

2013

J. Agric. Meteorol.

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Intracanopy lighting (IL) is a newly proposed supplemental lighting technique, irradiating lower leaves of plants from light sources placed between plant stands in high-wire grown vegetable production in a greenhouse. Light-emitting diodes (LEDs) are an appropriate light source for IL because of their compactness and low operating temperatures. To take advantage of features of LEDs, which emit light with a narrow band of wavelengths, we investigated short-term effects of spectra on instantaneous photosynthesis and long-term effects on a decrease in photosynthesis during the senescence of irradiated lower leaves of chamber-grown sweet pepper plants. First, the instantaneous photosynthetic rate of each plant's fifth leaf was measured under white and monochromatic blue, green and red LED lights at a photosynthetic photon flux density (PPFD) of 150 µmol m -2 s -1 . We confirmed that the rate was low under green light. Second, we grew plants for five weeks in five treatments: four treatments with the fifth leaves irradiated with white, blue, green and red LEDs at a PPFD of 150 µmol m -2 s -1 , and one treatment without irradiation. After the treatments, photosynthetic rates of the irradiated leaves were measured to investigate the long-term effects. Measurements were performed at PPFDs of 300 and 1500 µmol m -2 s -1 with red and blue LEDs, irrespective of the treatments. The lighting treatments seemed to retard the decreases in photosynthetic rates irrespective of the spectra, but stomatal conductance (g s ) of the leaves grown under green light tended to be low compared to those measured under the other colors. In addition to the lower instantaneous photosynthesis, green light might have less enhancing effects on the photosynthesis of the irradiated leaves from the viewpoint of long-term effects. Based on these results, we concluded that green LEDs are not appropriate as an IL light source from the viewpoint of single-leaf photosynthesis.

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“…However, this has not been studied under winter conditions in Japan. In recent years, supplemental illumination of plants from the top or from the top and the side by using highpressure sodium lamps (HPS) and other artificial light sources (fluorescent lamps and light-emitting diodes [LEDs]) has been widely used for the production of many crops in greenhouses across Northern Europe and Canada, including tomato (Gunnlaugsson and Adalsteinsson, 2006;Heuvelink et al, 2006), cucumber (Hovi et al, 2004;Trouwborst et al, 2010), and sweet pepper (Hovi-Pekkanen et al, 2006). Many studies have shown the positive effects of supplemental lighting on fruit growth and yield.…”

Section: Effects Of Supplemental Lighting On Growth and Medicinal Commentioning

confidence: 99%

Effects of Supplemental Lighting on Growth and Medicinal Compounds of Japanese Honeysuckle (<I>Lonicera japonica</I> Thunb.)

Hikosaka

Iwamoto

Gotō

et al. 2017

Environmental Control in Biology

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Japanese honeysuckle is an evergreen vine that grows naturally in Japan and East Asia. The buds and leaves of this plant are used as crude drugs known as Kinginka and Nindou, respectively, in Japan and East Asia. The medicinal compounds are chlorogenic acid and luteolin, which have antiviral, anticancer, anti-inflammatory, and antioxidant activities. The optimal environmental conditions for growing Japanese honeysuckle have remained unknown thus far. The aim of this study was to investigate the effects of supplemental lighting in winter greenhouse on growth and production of medicinal compounds in Japanese honeysuckle. For that purpose, we cultivated Japanese honeysuckle plants in a greenhouse using supplemental lighting from high-pressure sodium lamps. During the experiment, the daily light integral was maintained at 10 mol m 2 d 1 by controlling the irradiation period of supplemental lighting from the evening until midnight. The total dry weight and total leaf area of plants subjected to 55 d of supplemental lighting were significantly higher than those in control plants. The number of flower buds was significantly higher in treated plants, and then, there was no difference in the concentration of chlorogenic acid and luteolin between the two groups. In conclusion, supplemental lighting is a useful method for winter cultivation of Japanese honeysuckle that increases the yield of flower buds and does not decrease the concentration of main medicinal compounds.

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Increasing Productivity of Sweet Pepper With Interlighting

Cited by 30 publications

References 0 publications

The Effect of Irradiating Adaxial or Abaxial Side on Photosynthesis of Rose Leaves

The Effect of Irradiating Adaxial or Abaxial Side on Photosynthesis of Rose Leaves

Effects of supplemental lighting to a lower leaf using light-emitting diodes with different spectra on the leaf photosynthetic rate in sweet pepper

Effects of Supplemental Lighting on Growth and Medicinal Compounds of Japanese Honeysuckle (<I>Lonicera japonica</I> Thunb.)

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