The effects of light-emitting diode lighting on greenhouse plant growth and quality

Abstract

The aim of this study is to present the light emitting diode (LED) technology for greenhouse plant lighting and to give an overview about LED light effects on photosynthetic indices, growth, yield and nutritional value in green vegetables and tomato, cucumber, sweet pepper transplants. The sole LED lighting, applied in closed growth chambers, as well as combinations of LED wavelengths with conventional light sources, fluorescent and high pressure sodium lamp light, and natural illumination in greenhouses are overviewed. Red and blue light are basal in the lighting spectra for green vegetables and tomato, cucumber, and pepper transplants; far red light, important for photomorphogenetic processes in plants also results in growth promotion. However, theoretically unprofitable spectral parts as green or yellow also have significant physiological effects on investigated plants. Presented results disclose the variability of light spectral effects on different plant species and different physiological indices.

The Yield of Lettuce Breeding Line Under Led Lamps in Winter Greenhouse in the North

“…Светодиоды могут модулировать рост, развитие и морфогенез растений, влияют на структуру и активность фотосинтетиче-ского аппарата, общий метаболизм, накопление и состав биомассы [3][4][5][6][7][8].…”

Modificaciones fotomorfogénicas inducidas por la calidad de la luz en plantas cultivadas

“…El mejor desarrollo foliar en las plantas evaluadas probablemente se debió al efecto Emerson, ya que bajo los filtros fotoselectivos rojos, las longitudes de onda están en el rango de los 670 a los 700 nm, lo cual supondría un aumento en la tasa de fotosíntesis bajo dicha cobertura. Por otro lado, la luz roja es un componente del espectro visible y este solo hecho es suficiente para que la planta crezca y realice su proceso fotosintético (Lu, et al, 2012, Olle & Virsile, 2013.…”

The Impact of Spectral Composition of White LEDs on Spinach (Spinacia oleracea) Growth and Development

“…In [4] it was demonstrated that supplemental LED lighting improved the lettuce growth parameters and showed that the photosynthetic utilization efficiency was higher compared to HPS conditions. Experiments on plant growth and development performed with different lighting spectral compositions confirmed that each band of light emission has specific effects on plant physiology and morphology [16]. In [17], blue light influenced leaf morphogenesis, promoting differentiation of mesophyll cells and the formation of intercellular spaces, also having positive effects on leaf thickness and area.…”