Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Current status and recent achievements in the field of horticulture with the use of light-emitting diodes (LEDs)
Bantis, Filippos ; Smirnakou, Sonia ; Ouzounis, Theoharis ; Koukounaras, Athanasios ; Ntagkas, Nikolaos ; Radoglou, Kalliopi - \ 2018
Scientia Horticulturae 235 (2018). - ISSN 0304-4238 - p. 437 - 451.
Greenhouse - Growth chamber - Light quality - Photomorphogenesis - Plant metabolism - Vertical farming
Light-emitting diode (LED) technology has rapidly advanced the past years and it is nowadays irrevocably linked with controlled-environment agriculture (CEA). We provide here an amalgamation of the recent research achievements in the horticulture and floriculture industry, ranging from greenhouse applications to climate rooms and vertical farming. We hope this overview bestows ample examples for researchers and growers in the selection of the appropriate LED light solution for amending crop yield, phytochemical content, nutritional value, flowering control, transplant success, pre-harvest and postharvest product quality, and production of regeneration material. We leave the reader with some future prospects and directions that need to be taken into account in this ever-growing field.
Lettuce growth and quality optimization in a plant factory
Nicole, C.C.S. ; Charalambous, F. ; Martinakos, S. ; De Voort, S. Van; Li, Z. ; Verhoog, M. ; Krijn, M. - \ 2016
Acta Horticulturae 1134 (2016). - ISSN 0567-7572 - p. 231 - 238.
Anthocyanin - Controlled-environment agriculture - Light-emitting diode - Photomorphogenesis - Photosynthesis - Phytochemicals

Since the early 2000s, plant factory (or vertical farm) technology has been introduced for growing vegetables and soft fruits. With a well-controlled environment, new health benefits, food safety, optimized nutrients and increased shelf-life can be offered to consumers. With the progress of light emitting diode (LED) lighting efficiency and the knowledge of light-plant interaction, a better quality control can now be achieved together with improved energy efficiency. Growth strategies combining crop quality attributes (e.g., color, nutrients, shelf life) with efficient growth are key for economic viability of plant factories. Most research so far has been addressing quality and growth efficiency separately. Several strategies exist from literature to improve quality attributes, but so far not in terms of optimization of the total growth efficiency including space and energy use. We are aiming to achieve a high growth efficiency (in g mol-1) and at the same time fulfill the requirements on crop quality; for example: high yield, good color (high anthocyanin index or chlorophyll index) and texture (firmness), high flavonoids content or controlled nitrate levels. An optimization routine has been used with high technical engineering and plant physiology approach in a state of the art plant factory research center at Philips Research Laboratories. LED lighting with a large variety of spectral composition (from UV to far-red) and dynamic control has been used with a total radiation level dimmable per color up to 600 μmol m-2 s-1. In this presentation we will illustrate our optimization approach (growth recipe) with specific experimental results on three different red lettuce cultivars with results showing the evolution of the anthocyanin accumulation, spacing optimization and yield during growth.

Blue and red LED lighting effects on plant biomass, stomatal conductance, and metabolite content in nine tomato genotypes
Ouzounis, T. ; Heuvelink, E. ; Ji, Y. ; Schouten, H.J. ; Visser, R.G.F. ; Marcelis, L.F.M. - \ 2016
Acta Horticulturae 1134 (2016). - ISSN 0567-7572 - p. 251 - 258.
Chlorophyll - Flavonol - Greenhouse horticulture - Light emitting diodes - Photomorphogenesis

A collection of nine tomato genotypes was chosen based on their diversity, phylogeny, availability of genome information, and agronomic traits. The objective of the study was to characterize the effect of red and blue LED (light-emitting diode) lighting on physiological, morphological, developmental, and chemical parameters. Two LED light treatments were imposed: (1): 100% red and (2): 88% red/12% blue (peak emission at 662 and 456 nm for red and blue light, respectively). The combination of blue and red LED lighting increased total dry matter in seven of the nine genotypes compared to red. Upward or downward leaf curling was observed in all genotypes in the 100% red treatment. Stomatal conductance was not affected much by additional blue light, but blue light increased chlorophyll and flavonol contents in three genotypes. The exposure of tomato plants to a combination of red and blue LEDs alleviated leaf morphological abnormalities and enhanced plant biomass, and variably affected stomatal conductance and secondary metabolism compared to red light alone.

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