The δ15N of lettuce and barley are affected by AM status and external concentration of N
The δ15N of lettuce and barley are affected by AM status and external concentration of N
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DOI：
10.1046/j.1469-8137.1998.00883.x
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发表时间：
1998-01-01
期刊：
影响因子：
9.4
通讯作者：
Scrimgeour, CM
中科院分区：
文献类型：
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作者：
Azcon-G-Aguilar, R;Handley, LL;Scrimgeour, CM
平均δ（15）N匕首生菜和大麦的整个植物的变化小于或等于千分之三，当化学和同位素均匀的N源。这种变化与丛枝菌根（AM）真菌的存在，不存在和物种和外部N浓度。一个高度AM敏感的植物（莴苣）的治疗反应不同，比一个不太敏感的（大麦）。整个植物δ（15）N的最大变化与田间条件下最有可能发现的实验组合有关：真菌与不同外部浓度的N相互作用。观察到的植物δ（15）N变化的机制尚不清楚，也不能直接使用δ（15）N进行处理。然而，描述性的数据，如这里，是重要的发展的一个机制模型，因为它们建议的关系，为未来的研究，阿利亚是N-15富集示踪剂。他们还证实，植物氮源，不能确定使用植物δ（15）N，即使菌根协会的类型（内与外）是已知的。
Mean delta(15)N dagger Of whole-plants of lettuce and barley varied by less than or equal to 3 parts per thousand, when given a chemically and isotopically uniform N source. This variation was related to the presence, absence and species of arbuscular mycorrhizal (AM) fungi and to external N concentration. A highly AM-susceptible plant (lettuce) responded to treatments differently than a less susceptible one (barley). The largest change in whole plant delta(15)N was related to the experimental combination most likely to be found in field conditions: species of fungus interacting with varying external concentrations of N.The mechanisms underlying observed variations of plant delta(15)N are not understood, nor can they be approached directly using delta(15)N. However, descriptive data, such as presented here, are important to the development of a mechanistic model, because they suggest relationships for future research, using inter alia N-15-enriched tracers. They also confirm that plant N sources, cannot be identified using plant delta(15)N, even when the type of mycorrhizal association (endo vs. ecto) is known.