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Green-light Supplementation for Enhanced Lettuce Growth Under Red- And Blue-Light-Emitting Diodes

Green-light Supplementation for Enhanced Lettuce Growth Under Red- And Blue-Light-Emitting Diodes

Hyeon-Hye Kim, Gregory D Goins, Raymond M Wheeler, John C Sager

HortScience. 2004 Dec;39(7):1617-22.

PMID: 15770792

Abstract:

Plants will be an important component of future long-term space missions. Lighting systems for growing plants will need to be lightweight, reliable, and durable, and light-emitting diodes (LEDs) have these characteristics. Previous studies demonstrated that the combination of red and blue light was an effective light source for several crops. Yet the appearance of plants under red and blue lighting is purplish gray making visual assessment of any problems difficult. The addition of green light would make the plant leave appear green and normal similar to a natural setting under white light and may also offer a psychological benefit to the crew. Green supplemental lighting could also offer benefits, since green light can better penetrate the plant canopy and potentially increase plant growth by increasing photosynthesis from the leaves in the lower canopy. In this study, four light sources were tested: 1) red and blue LEDs (RB), 2) red and blue LEDs with green fluorescent lamps (RGB), 3) green fluorescent lamps (GF), and 4) cool-white fluorescent lamps (CWF), that provided 0%, 24%, 86%, and 51% of the total PPF in the green region of the spectrum, respectively. The addition of 24% green light (500 to 600 nm) to red and blue LEDs (RGB treatment) enhanced plant growth. The RGB treatment plants produced more biomass than the plants grown under the cool-white fluorescent lamps (CWF treatment), a commonly tested light source used as a broad-spectrum control.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP1430803216	Green light-emitting spiro-copolymer		1430803-21-6	Price

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