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Differential response of Scots pine seedlings to variable intensity and ratio of red and far-red light
Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC). Umeå University, Faculty of Science and Technology, Department of Plant Physiology. Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, Umeå SE-901 87, Sweden.
Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC). Umeå University, Faculty of Science and Technology, Department of Plant Physiology. Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, Umeå SE-901 87, Sweden.
Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC). Umeå University, Faculty of Science and Technology, Department of Plant Physiology.
2017 (English)In: Plant, Cell and Environment, ISSN 0140-7791, E-ISSN 1365-3040, Vol. 40, no 8, 1332-1340 p.Article in journal (Refereed) Published
Abstract [en]

We investigated the response to increasing intensity of red (R) and far-R (FR) light and to a decrease in R: FR ratio in Pinus sylvestris L. (Scots pine) seedling. The results showed that FR high-irradiance response for hypocotyl elongation may be present in Scots pine and that this response is enhanced by increasing light intensity. However, both hypocotyl inhibition and pigment accumulation were more strongly affected by the R light compared with FR light. This is in contrast to previous reports in Arabidopsis thaliana (L.) Heynh. In the angio-sperm, A. thaliana R light shows an overall milder effect on inhibition of hypocotyl elongation and on pigment biosynthesis compared with FR suggesting conifers and angiosperms respond very differently to the different light regimes. Scots pine shade avoidance syndrome with longer hypocotyls, shorter cotyledons and lower chlorophyll content in response to shade conditions resembles the response observed in A. thaliana. However, anthocyanin accumulation increased with shade in Scots pine, which again differs from what is known in angiosperms. Overall, the response of seedling development and physiology to R and FR light in Scots pine indicates that the regulatory mechanism for light response may differ between gymnosperms and angiosperms.

Place, publisher, year, edition, pages
John Wiley & Sons, 2017. Vol. 40, no 8, 1332-1340 p.
Keyword [en]
light intensity, light quality, R:FR ratio, shade avoidance syndrome, seedling morphology, pigment synthesis
National Category
Zoology Botany
Identifiers
URN: urn:nbn:se:umu:diva-137934DOI: 10.1111/pce.12921ISI: 000405275300008OAI: oai:DiVA.org:umu-137934DiVA: diva2:1129358
Available from: 2017-08-02 Created: 2017-08-02 Last updated: 2017-08-02Bibliographically approved

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Ranade, Sonali SachinStrand, Åsa
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