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- Aguetoni Cambui, Camila, et al.
(författare)
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Patterns of Plant Biomass Partitioning Depend on Nitrogen Source
- 2011
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Ingår i: PLoS ONE. - : Public Library of Science (PLoS). - 1932-6203. ; 6
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Tidskriftsartikel (refereegranskat)abstract
- Nitrogen (N) availability is a strong determinant of plant biomass partitioning, but the role of different N sources in this process is unknown. Plants inhabiting low productivity ecosystems typically partition a large share of total biomass to belowground structures. In these systems, organic N may often dominate plant available N. With increasing productivity, plant biomass partitioning shifts to aboveground structures, along with a shift in available N to inorganic forms of N. We tested the hypothesis that the form of N taken up by plants is an important determinant of plant biomass partitioning by cultivating Arabidopsis thaliana on different N source mixtures. Plants grown on different N mixtures were similar in size, but those supplied with organic N displayed a significantly greater root fraction. (15)N labelling suggested that, in this case, a larger share of absorbed organic N was retained in roots and split-root experiments suggested this may depend on a direct incorporation of absorbed amino acid N into roots. These results suggest the form of N acquired affects plant biomass partitioning and adds new information on the interaction between N and biomass partitioning in plants.
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- Gruffman, Linda, et al.
(författare)
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Cultivation of Norway spruce and Scots pine on organic nitrogen improves seedling morphology and field performance
- 2012
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Ingår i: Forest Ecology and Management. - : Elsevier BV. - 0378-1127 .- 1872-7042. ; 276, s. 118-124
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Tidskriftsartikel (refereegranskat)abstract
- Nitrogen availability exerts a significant control on biomass allocation of plants including Norway spruce (Picea abies (L.) Karst.) and Scots pine (Pinus sylvestris (L)) in boreal forest ecosystems. Recent studies suggest, however, this control differs for inorganic and organic nitrogen sources. The importance of the chemical form of nitrogen (inorganic or organic) for the morphology and growth of conifer seedlings was studied during production of seedlings in a forest nursery and subsequently in a field trial in northern Sweden. Seedlings were supplied with two different nutrient solutions; an inorganic conventional fertilizer and an organic, amino acid-based fertilizer. Seedlings cultivated on the organic nitrogen source displayed larger root systems resulting in a higher root: shoot ratio than did seedlings cultivated on the inorganic nitrogen source. The proportion of fine roots to lateral roots and the root tip proportion colonized by mycorrhiza were positively affected by the organic nitrogen source. Norway spruce seedlings cultivated on organic nitrogen displayed significantly increased shoot growth compared to seedlings cultivated on inorganic nitrogen. Our results suggest that the chemical form of nitrogen influences the allocation of biomass in conifer seedlings. The shift in allocation of resources to root biomass further leads to a competitive advantage in field conditions, resulting in a significant increase in shoot growth one year following transplant. (C) 2012 Elsevier B.V. All rights reserved.
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- Malmgren, Helge, 1945, et al.
(författare)
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Ivar Segelberg – philosopher and botanist
- 2014
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Ingår i: Philosophy and Botany. Essays on Ivar Segelberg. Eds. H. Malmgren, T. Nordin & C. Svennerlind. - Stockholm : Thales. - 9789172350953 ; , s. 13-32
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- A biography of Ivar Segelberg (1914–1987).
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| 6. |
- Malmgren, Helge, 1945, et al.
(författare)
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Ivar Segelberg’s “The Biological Species Concept”
- 2014
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Ingår i: Philosophy and Botany. Essays on Ivar Segelberg. Eds. H. Malmgren, T. Nordin & C. Svennerlind. - Stockholm : Thales. - 9789172350953 ; , s. 209-211
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- A short introduction to Ivar Segelberg's essay on the biological species concept (in the same volume)
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Philosophy and botany : essays on Ivar Segelberg
- 2014
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Samlingsverk (redaktörskap) (övrigt vetenskapligt/konstnärligt)abstract
- A collection of essays about the life and work of Ivar Segelberg (1914-87), professor of philosophy in Gothenburg 1951-1979. Segelberg was also an internationally renowned amateur botanist who contributed substantially to the Italian national flora. Among other things, the book contains a newly written biography and a hitherto unpublished paper by Segelberg on the biological species concept and its history.
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