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On inorganic N uptake by vascular plants: Can 15N tracer techniques resolve the NH4+ versus NO3− “preference” conundrum?
European Journal of Soil Science ( IF 4.2 ) Pub Date : 2020-11-12 , DOI: 10.1111/ejss.13069
Phillip Chalk 1 , Christopher Smith 2
Affiliation  

The relative uptake by plants of the two ionic nitrogen (N) forms, ammonium (NH4+) and nitrate (NO3), has been the subject of much interest during the past 50 years, resulting in a considerable scientific literature. The general idea is that plants have choice, resulting in preference for either one mineral N form or the other. Unfortunately, there is no specific definition of preference or agreement on how it should be measured. In this review, we critically examine the alternative techniques that have been used to measure the relative uptake of NH4+ and NO3 by plants, including those based on unlabelled sources, 15N-enriched mineral N forms and variations in the 15N natural abundance of mineral N sources. The main difficulty with using unlabelled N is the antecedent N in plant tissue prior to the imposition of treatments. Although 15N-enrichment overcomes this obstacle, it is nevertheless difficult to separate uptake as 15NH4+, uptake as 15NO3 and uptake as 15NO3 derived from the nitrification of 15NH4+. With 15N natural abundance, isotopic fractionation during plant uptake complicates the interpretation of data. There is increasing evidence that plants exhibit flexibility or plasticity with respect to the use of mineral N forms rather than preference.

中文翻译:

关于维管植物对无机氮的吸收:15N 示踪技术能否解决 NH4+ 与 NO3-“偏好”难题?

植物对两种离子态氮 (N) 的相对吸收,铵 (NH 4 + ) 和硝酸盐 (NO 3 - ),在过去 50 年中一直是备受关注的主题,产生了大量的科学文献。一般的想法是植物有选择权,导致偏爱一种矿物 N 形式或另一种形式。不幸的是,没有关于偏好的具体定义,也没有就如何衡量偏好达成一致。在这篇综述中,我们批判性地研究了用于测量植物对 NH 4 +和 NO 3 -的相对吸收的替代技术,包括那些基于未标记来源的技术,15富含 N 的矿物 N 的形式和15 N 矿物 N 源天然丰度的变化。使用未标记 N 的主要困难是在施加处理之前植物组织中的先行 N。虽然15的N-富集克服这个障碍,但它仍然是难以分离的摄取为15 NH 4 +,作为摄取15 NO 3 -和摄取作为15 NO 3 -从硝化得出15 NH 4 +。与15N 自然丰度,植物吸收过程中的同位素分馏使数据的解释复杂化。越来越多的证据表明,植物在使用矿物氮形式而不是偏好方面表现出灵活性可塑性
更新日期:2020-11-12
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