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Light shock stress after outdoor sunlight exposure in seedlings of picea abies (L.) Karst. and Pinus sylvestris L. pre-cultivated under LEDs-possible mitigation treatments and their energy consumption
Dalarna University, School of Technology and Business Studies, Energy Technology. Uppsala Universitet.ORCID iD: 0000-0001-6805-2112
Dalarna University, School of Technology and Business Studies, Forest and Wood Technology.
2020 (English)In: Forests, ISSN 1999-4907, E-ISSN 1999-4907, Vol. 11, no 3, article id 354Article in journal (Refereed) Published
Abstract [en]

Year-round cultivation under light emitting diodes (LEDs) has gained interest in boreal forest regions like Fenno-Scandinavia. This concept offers forest nurseries an option to increase seedling production normally restricted by the short vegetation period and the climate conditions. In contrast to some horticultural crops which can be cultivated entirely under LEDs without sunlight, forest seedlings need to be transplanted outdoors in the nursery at a very young age before being outplanted in the field. Juvenile plants are less efficient using absorbed light and dissipating excess energy making them prone to photoinhibition at conditions that usually do not harm mature plants. The outdoor transfer can cause stress in the seedlings due to high sunlight intensity and exposure to ultraviolet (UV) radiation not typically present in the spectra of LED lamps. This study tested possible treatments for mitigating light shock stress in seedlings of Picea abies (L.) Karst. and Pinus sylvestris L. transplanted from indoor cultivation under LEDs to outdoor sunlight exposure. Three sowings were carried out in 2014 (May and June) and 2015 (May) cultivating the seedlings during five weeks under LED lights only. Afterwards, higher light intensity or UV radiation treatments were applied during one week in order to adapt the seedlings to natural outdoor conditions. After transplanting a transition phase was introduced using shading cloths for one or three weeks as outdoor treatments for light shock mitigation. Chlorophyll fluorescence (ChlF) levels and CO2 assimilation rates were measured before transplanting and followed outdoors during 5 weeks. The ChlF results revealed stress symptoms in the photoreceptors during the first days after transplanting. After five weeks outdoors the ChlF levels had recovered and the light saturation points had shifted, allowing higher CO2 assimilation rates. By the end of the vegetation period the morphological attributes showed no major differences between treatments. © 2020 by the authors. Licensee MDPI, Basel, Switzerland.

Place, publisher, year, edition, pages
MDPI AG , 2020. Vol. 11, no 3, article id 354
Keywords [en]
Forest tree seedlings, Light emitting diodes, Light quality and intensity, Light-shock, Photoinhibition, Year-round production
National Category
Agricultural Science, Forestry and Fisheries
Research subject
Energy and Built Environments
Identifiers
URN: urn:nbn:se:du-32385DOI: 10.3390/f11030354Scopus ID: 2-s2.0-85082336610OAI: oai:DiVA.org:du-32385DiVA, id: diva2:1422299
Available from: 2020-04-07 Created: 2020-04-07 Last updated: 2020-04-07

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Hernandez Velasco, MarcoMattsson, Anders

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CiteExportLink to record
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Citation style
  • apa
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