Distinct Carbon and Nitrogen Metabolism of Two Contrasting Poplar Species in Response to Different N Supply Levels.
Distinct Carbon and Nitrogen Metabolism of Two Contrasting Poplar Species in Response to Different N Supply Levels.
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两种对比杨树物种对不同氮供应水平的不同碳和氮代谢反应
DOI：
10.3390/ijms19082302
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发表时间：
2018-08-06
影响因子：
5.6
通讯作者：
Yin W
中科院分区：
文献类型：
--
作者：
Meng S;Wang S;Quan J;Su W;Lian C;Wang D;Xia X;Yin W
杨树进化出各种策略来优化对环境条件的适应反应。然而，杨树如何平衡生长和缺氮仍有待阐明。研究了低、中、高3种氮素处理对慢生西杨（Ps）和速生欧美杨（Pe）幼苗根系发育、碳氮生理及相关基因转录丰度的影响。低氮胁迫下，生长缓慢的油菜系统繁盛，δ15N较高，碳输出加快，氮素吸收和同化降低，转录调控不敏感。由于光合产物转运到根系，刺激了根系发育，使生长缓慢的磷具有更强的抗缺氮能力，从而使其得以存活。为了支持其快速代谢和生长，与生长缓慢的Ps相比，快速生长的Pe表现出更大的根系发育、碳氮吸收和同化能力，以及更响应的转录调控和更大的氮供应。这些数据表明，在不同的氮供应条件下，杨树对碳氮代谢和光合分配的管理存在差异。
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.
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