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Nitrogen nutrition and biomass distribution in conifers

aspects of organic and inorganic nitrogen acquisition

Gruffman, Linda (2013). Nitrogen nutrition and biomass distribution in conifers. Diss. (sammanfattning/summary) Umeå : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2013:22
ISBN 978-91-576-7783-9
[Doctoral thesis]

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The main objectives of the work presented in this thesis were to increase our understanding of how different chemical forms of nitrogen (N) affect the growth and biomass distribution of conifer seedlings and hence their establishment and performance in field. Growth studies of Scots pine (Pinus sylvestris (L.)), Norway spruce (Picea abies (L.) Karst.) and the model plant Arabidopsis (Arabidopsis thaliana, ecotype Col-0) showed that plants can grow at similar (or higher) rates on organic N sources to those on the inorganic N sources ammonium (NH4+) and nitrate (NO3-). Cultivation on arginine also improved the field performance of Norway spruce seedlings by increasing their current-year shoot growth, despite smaller initial shoot length. Moreover, plants supplied with organic N distributed a relatively larger proportion of their biomass to root structures than controls with similar total biomass and N contents grown on inorganic N sources. Detailed studies on Arabidopsis revealed that an increase in the root:shoot ratio coincided with high retention of organic N in the roots, implying that the site of assimilation may be of importance for the short-term distribution of biomass. Further, studies on Scots pine seedlings deprived of carbohydrates suggested that the uptake, reduction and assimilation of NO3- are highly dependent on recent photoassimilates and that use of organic N may have considerable energetic benefits for plants, especially under conditions that limit carbohydrate supplies.

The results from the studies underlying this thesis highlight the potential role of organic N in the nutrition of conifer seedlings, the links between seedling nutrition, morphology and field performance, and effects of organic N on biomass distribution. They suggest that organic N may serve as an alternative or complement to inorganic N sources in seedling production, and may help attempts to improve seedling establishment in the field.

Authors/Creators:Gruffman, Linda
Title:Nitrogen nutrition and biomass distribution in conifers
Subtitle:aspects of organic and inorganic nitrogen acquisition
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2013
Number of Pages:47
I.Cambui C.A., Svennerstam H., Gruffman L., Nordin A., Ganeteg U. and Näsholm T. (2011). Patterns of plant biomass partitioning depend on nitrogen source. PLoS ONE 6(4), e19211.
II.Gruffman L., Palmroth S. and Näsholm T. Organic nitrogen uptake of Scots pine seedlings is independent of current carbohydrate supply. (submitted manuscript).
III.Gruffman L., Jämtgård S. and Näsholm T. Nitrogen status and co-occurrence of organic and inorganic nitrogen sources influence root uptake by Scots pine seedlings. (manuscript).
IV.Gruffman L., Ishida T., Nordin A. and Näsholm T. (2012). Cultivation of Norway spruce and Scots pine on organic nitrogen improves seedling morphology and field performance. Forest Ecology and Management 276, 118-124.
Place of Publication:Umeå
Publisher:Dept. of Forest Ecology and Management, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-576-7783-9
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:F Plant production > F61 Plant physiology - Nutrition
K Forestry > K10 Forestry production
P Natural resources > P35 Soil fertility
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
Agrovoc terms:picea abies, pinus sylvestris, arabidopsis thaliana, plant nutrition, nitrogen, carbon, organic nitrogen compounds, carbohydrates, roots, shoots, growth, biomass, seedlings, sweden
Keywords:Amino acids, Ammonium, Arabidopsis thaliana, Arginine, Carbohydrates, Carbon, Glutamine, Nitrate, Picea abies, Pinus sylvestris, root:shoot ratio
Permanent URL:
ID Code:10285
Department:(S) > Dept. of Forest Ecology and Management
External funders:FORMAS
Deposited By: Linda Gruffman
Deposited On:24 Apr 2013 11:30
Metadata Last Modified:02 Dec 2014 10:59

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