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Nitrogen use efficiency and related functional traits in wheat

influence of genotype and environment

Asplund, Linnéa (2014). Nitrogen use efficiency and related functional traits in wheat. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2014:30
ISBN 978-91-576-8008-2
eISBN 978-91-576-8009-9
[Doctoral thesis]

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Efficient use of nitrogen (N) is essential to decrease negative impacts of agriculture on the environment. This thesis evaluated the nitrogen use efficiency (NUE) of various wheat varieties, identified traits associated with high NUE and investigated the gene NAM-B1 in relation to some of these traits. To achieve this, a NUE concept was first developed.

Six varieties each of winter and spring wheat (Triticum aestivum ssp. aestivum) at two levels of N fertilisation were studied in a one-year field experiment. A greenhouse experiment was performed with the same six spring wheat varieties at two levels of N fertilisation and three levels of drought. Forty-two varieties of spring wheat were grown in a climate chamber experiment. Furthermore, 527 wheat accessions were genotyped for their allele type of NAM-B1, a gene known to affect grain N concentration and senescence of wheat.

The NUE concept developed here proved relevant in different experimental set-ups, as shown by the varieties ranking similarly in overall NUE and uptake efficiency in the greenhouse and the field. Associations between functional traits and NUE were more evident at low than at high N, suggesting that functional traits might be particularly useful for identifying efficient varieties in limiting N conditions. Grain N content was associated with chlorophyll in the top leaf around anthesis (measured by a SPAD chlorophyll meter) both in the climate chamber and in winter wheat in the field. This suggests that a high SPAD value in a variety can be used as an indicator of high N yield.

Genotyping revealed that the functional allele of NAM-B1 has been preserved in many varieties from Denmark, Finland, Norway and Sweden, but not in varieties from other parts of the world. Swedish varieties with this functional allele did not have higher grain N concentrations, but had accelerated senescence and more ears. Effects of the allele in different environments, e.g. varying temperature and fertilisation, should be further investigated to determine when this allele has positive effects on grain N concentration and yield.

Authors/Creators:Asplund, Linnéa
Title:Nitrogen use efficiency and related functional traits in wheat
Subtitle:influence of genotype and environment
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2014
Number of Pages:60
I.Weih, M., Asplund, L. & Bergkvist, G. (2011). Assessment of nutrient use in annual and perennial crops: A functional concept for analyzing nitrogen use efficiency. Plant and Soil 339(1-2), 513-520.
II.Asplund, L., Bergkvist, G. & Weih, M. (2014). Proof of concept: nitrogen use efficiency of contrasting spring wheat varieties grown in greenhouse and field. Plant and Soil 374(1-2), 829-842.
III.Asplund, L. Bergkvist, G. & Weih, M. Functional traits associated with nitrogen use efficiency in wheat (manuscript).
IV.Hagenblad, J., Asplund, L., Balfourier, F., Ravel, C. & Leino, M.W. (2012). Strong presence of the high grain protein content allele of NAM-B1 in Fennoscandian wheat. Theoretical and Applied Genetics 125(8), 1677-1686.
V.Asplund, L., Bergkvist, G., Leino, M.W., Westerbergh, A. & Weih, M. (2013). Swedish spring wheat varieties with the rare high grain protein allele of NAM-B1 differ in leaf senescence and grain mineral content. PLoS ONE 8(3), e59704.
Place of Publication:Uppsala
Publisher:Institutionen för växtproduktionsekologi, Sveriges lantbruksuniversitet
ISBN for printed version:978-91-576-8008-2
ISBN for electronic version:978-91-576-8009-9
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:F Plant production > F04 Fertilizing
F Plant production > F30 Plant genetics and breeding
F Plant production > F40 Plant ecology
F Plant production > F62 Plant physiology - Growth and development
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Agricultural Science
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 404 Agricultural Biotechnology > Genetics and Breeding
Agrovoc terms:triticum aestivum, winter wheat, spring wheat, varieties, nitrogen, fertilizer application, drought, soil fertility, efficiency, senescence, genotype environment interaction
Keywords:Triticum aestivum, Nitrogen, NUE, Nutrients, Drought, NAM-B1, GPC-B1, Senescence, Spring wheat, Winter wheat
Permanent URL:
ID Code:11149
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Crop Production Ecology
Deposited By: Linnéa Asplund
Deposited On:28 Apr 2014 12:58
Metadata Last Modified:14 Dec 2014 19:49

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