The Effect of Supplemental Blue, Red and Far-Red Light on the Growth and the Nutritional Quality of Red and Green Leaf Lettuce — Oak Academic Publishing
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The Effect of Supplemental Blue, Red and Far-Red Light on the Growth and the Nutritional Quality of Red and Green Leaf Lettuce
Department of Horticulture and Natural Resources, Kansas State University, Manhattan, KS, USA
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Department of Food, Nutrition, Dietetics and Health, Kansas State University, Manhattan, KS, USA
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Department of Food, Nutrition, Dietetics and Health, Kansas State University, Manhattan, KS, USA
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Department of Horticulture and Natural Resources, Kansas State University, Manhattan, KS, USA
1 Department of Horticulture and Natural Resources, Kansas State University, Manhattan, KS, USA
2 Department of Food, Nutrition, Dietetics and Health, Kansas State University, Manhattan, KS, USA
3 Department of Food, Nutrition, Dietetics and Health, Kansas State University, Manhattan, KS, USA
4 Department of Horticulture and Natural Resources, Kansas State University, Manhattan, KS, USA
Spectral quality of radiation has a major impact on the growth, development and nutritional quality of crops. The effect of supplemental radiation (blue, red and far-red) on the growth and nutritional quality with regard to health-promoting phytochemical and micronutrient composition of two lettuce ( Lactuca sativa ) varieties (red leaf “New Red Fire” and green leaf “Two Star”) was studied. Supplemental radiation was provided by blue (450 nm), red (660 nm) or far-red (730 nm) LEDs against a background of white light (fluorescent lighting, PAR; 270 μ mol/m 2 /s) in a growth chamber study. All the supplemental radiation treatments increased dry shoot biomass in both varieties. However, supplemental far-red radiation increased both fresh and dry shoot biomass in both varieties. In addition, supplemental far-red radiation produced distinct morphological characteristics in lettuce plants. It produced the largest shoot biomass, bigger and taller plants, fewer leaves but with larger leaf area compared to the control, similar to the shade avoidance response. With regard to the accumulation of phytochemicals, supplemental blue radiation enhanced the total phenolic compound concentration in both varieties. In addition, supplemental blue radiation sharply increased the accumulation of several phenolic compounds in green leaf lettuce including chlorogenic acid, chicoric acid, rutin, kaempferol, luteolin and apigenin. For example, the leaf concentration of rutin in green leaf lettuce increased by 20-fold under supplemental blue radiation. Similarly, supplemental red radiation increased the concentration of many of these phenolic compounds in red leaf lettuce. However, supplemental far-red radiation had an inhibitory effect on the accumulation of chlorogenic acid, chicoric acid, rutin and kaempferol in red leaf lettuce. While supplemental radiation did not affect the accumulation of most of the micronutrients, it had a negative impact on the accumulation of some micronutrients, the response being variety dependent. The results show that supplementing white light with specific spectral quality has a major impact on the biomass accumulation, morphology and on the accumulation of many health-promoting phytochemicals and micronutrients in lettuce. While it had a larg e positive effect in enhancing the accumulation of several phytochemicals, it also suppressed the accumulation of some micronutrients.
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