The carbon bonus of organic nitrogen enhances nitrogen use efficiency of plants
Franklin, Oskar (International Institute for Applied Systems Analysis (Àustria))
Cambui, Camila Aguetoni (Umeå Plant Science Centre)
Gruffman, Linda (Sveriges lantbruksuniversitet. Institutionen för skogens ekologi och skötsel)
Palmroth, Sari (Nicholas School of the Environment and Earth Sciences (Duke University))
Oren, Ram (Nicholas School of the Environment and Earth Sciences (Duke University))
Näsholm, Torgny (Umeå Plant Science Centre)

Data:	2017
Resum:	The importance of organic nitrogen (N) for plant nutrition and productivity is increasingly being recognized. Here we show that it is not only the availability in the soil that matters, but also the effects on plant growth. The chemical form of N taken up, whether inorganic (such as nitrate) or organic (such as amino acids), may significantly influence plant shoot and root growth, and nitrogen use efficiency (NUE). We analysed these effects by synthesizing results from multiple laboratory experiments on small seedlings (Arabidopsis, poplar, pine and spruce) based on a tractable plant growth model. A key point is that the carbon cost of assimilating organic N into proteins is lower than that of inorganic N, mainly because of its carbon content. This carbon bonus makes it more beneficial for plants to take up organic than inorganic N, even when its availability to the roots is much lower - up to 70% lower for Arabidopsis seedlings. At equal growth rate, root:shoot ratio was up to three times higher and nitrogen productivity up to 20% higher for organic than inorganic N, which both are factors that may contribute to higher NUE in crop production.
Ajuts:	European Commission 610028
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Allocation ; Amino acids ; Ammonium ; Assimilation ; Growth model ; Nitrate ; Nitrate source; ; Plant theory
Publicat a:	Plant, cell & environment, Vol. 40, issue 1 (Jan. 2017) , p. 25-35, ISSN 1365-3040

DOI: 10.1111/pce.12772
PMID: 27241731

11 p, 588.8 KB

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