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Int. J. Mol. Sci. 2018, 19(8), 2302; https://doi.org/10.3390/ijms19082302

Distinct Carbon and Nitrogen Metabolism of Two Contrasting Poplar Species in Response to Different N Supply Levels

1
Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, National Engineering Laboratory for Tree Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Beijing 100083, China
2
College of Forestry, Henan Agricultural University, Zhengzhou 450002, China
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 6 June 2018 / Revised: 16 July 2018 / Accepted: 31 July 2018 / Published: 6 August 2018
(This article belongs to the Special Issue Photosynthesis)
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Abstract

Poplars have evolved various strategies to optimize acclimation responses to environmental conditions. However, how poplars balance growth and nitrogen deficiency remains to be elucidated. In the present study, changes in root development, carbon and nitrogen physiology, and the transcript abundance of associated genes were investigated in slow-growing Populus simonii (Ps) and fast-growing Populus euramericana (Pe) saplings treated with low, medium, and high nitrogen supply. The slow-growing Ps showed a flourishing system, higher δ15N, accelerated C export, lower N uptake and assimilation, and less sensitive transcriptional regulation in response to low N supply. The slow-growing Ps also had greater resistance to N deficiency due to the transport of photosynthate to the roots and the stimulation of root development, which allows survival. To support its rapid metabolism and growth, compared with the slow-growing Ps, the fast-growing Pe showed greater root development, C/N uptake and assimilation capacity, and more responsive transcriptional regulation with greater N supply. These data suggest that poplars can differentially manage C/N metabolism and photosynthate allocation under different N supply conditions. View Full-Text
Keywords: nitrogen uptake; photosynthate allocation; transcriptional regulation; stable nitrogen isotope; net inorganic nitrogen flux nitrogen uptake; photosynthate allocation; transcriptional regulation; stable nitrogen isotope; net inorganic nitrogen flux
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Meng, S.; Wang, S.; Quan, J.; Su, W.; Lian, C.; Wang, D.; Xia, X.; Yin, W. Distinct Carbon and Nitrogen Metabolism of Two Contrasting Poplar Species in Response to Different N Supply Levels. Int. J. Mol. Sci. 2018, 19, 2302.

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