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Determination of Ammonium Turnover and Flow Patterns Close to Roots Using Imaging Optodes

机译：用成像电极测定铵根的流失和接近根的流型

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摘要

The physical effect of nitrogen upon plants has been studied thoroughly; however, direct studies of nitrogen turnover close to roots have been limited by analytical techniques with low spatial and temporal resolution. Thus, little is known about differences in turnover taking place along and between intact root structures over time as well as how root arrangement, root cell type, plant age, microbial activity, and the dark/light cycle influence uptake and supply of nutrients to root structures. In this study an imaging (planar) optode was used to quantify ammonium over time close to an intact root system of a large fruit bearing tomato plant (Lycopersicon esculentum). Images throughout the experiment made it possible to define the ammonium depletion zone and active turnover potential as well as determine turnover rate and flow patterns around the root system over time. The results indicated that ammonium uptake for tomato plants proceeds over the entire root structure but transverse thin peripheral roots are about twice as efficient as the main root and that the uptake process might influence nutrient availability. The flow patterns close to the root structure revealed that apical regions seem to have a central role in ammonium acquisition.
机译：氮对植物的物理作用已得到深入研究。然而，对氮素转化接近根系的直接研究一直受到时空分辨率低的分析技术的限制。因此，对于完整的根系结构随着时间的推移以及根系之间的周转差异以及根系布置，根系细胞类型，植株年龄，微生物活性以及暗/光周期如何影响根系养分的吸收和供应，鲜为人知结构。在这项研究中，随着时间的推移，成像（平面）光电二极管被用于量化接近大型番茄果实（Lycopersicon esculentum）完整根系的铵离子。在整个实验过程中，通过图像可以确定铵耗竭区和活跃的转换潜力，并确定随着时间推移根系周围的转换速率和流动方式。结果表明，番茄植物对铵的吸收遍及整个根部结构，而横向细外围根的吸收效率约为主根的两倍，吸收过程可能会影响养分的利用率。接近根部结构的流动模式表明，顶端区域似乎在铵的获取中起着核心作用。

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  • 来源
    《Environmental Science & Technology》 |2008年第5期|1630-1637|共页
  • 作者

    NIKLAS STROMBERG;

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  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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