Interactions between uptake of amino acids and inorganic nitrogen in wheat plants
By E. Gioseffi, A. Neergaard, J. Schjoerring. 2011
102 citations recorded by the source corpus.
Abstract. Soil-borne amino acids may constitute a source of nitrogen (N) for plants in various terrestrial ecosystems but their importance for total N nutrition is unclear, particularly in nutrient-rich arable soils. One reason for this uncertainty is lack of information on how the absorption of amino acids by plant roots is affected by the simultaneous presence of inorganic N forms. The objective of the present study was to study absorption of glycine (Gly) and glutamine (Gln) by wheat roots and their interactions with nitrate (NO3−) and ammonium (NH4+) during uptake. The underlying hypothesis was that amino acids, when present in nutrient solution together with inorganic N, may lead to down-regulation of the inorganic N uptake, thereby resulting in similar total N uptake rates. Amino acids were enriched with double-labelled 15N and 13C, while NO3− and NH4+ acquisition was determined by their rate of removal from the nutrient solution surrounding the roots. The uptake rates of NO3− and NH4+ did not differ from each other and were generally about twice as high as the uptake rate of organic N when the different N forms were supplied separately in concentrations of 2 mM. Nevertheless, replacement of 50% of the inorganic N with organic N was able to restore the N uptake to the same level as that in the presence of only inorganic N. Co-provision of NO3− did not affect glycine uptake, while the presence of glycine down-regulated NO3− uptake. The ratio between 13C and 15N were lower in shoots than in roots and also lower than the theoretical values, reflecting higher C losses via respiratory processes compared to N losses. It is concluded that organic N can constitute a significant N-source for wheat plants and that there is an interaction between the uptake of inorganic and organic N.
Subfields: Plant Science, Soil Science
View Paper: https://www.semanticscholar.org/paper/ce8f7a29c1f2892e4a3bc74d46d3e85e8f2145d9
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Citations in the corpus
- Breeding for increased nitrogen‐use efficiency: a review for wheat (T. aestivum L.) (2016, background): “Thus, NO3 is the main source of N for most crop species, whether inorganic or organic N is provided to the plant (Nasholm et al. 2009, Gioseffi et al. 2012).”
- Exogenous Application of Amino Acids Improves the Growth and Yield of Lettuce by Enhancing Photosynthetic Assimilation and Nutrient Availability (2019, background): “, increases antioxidant enzyme activity and causes efficient nutrient uptake [25,34,35].”