Stable Nitrogen Isotopic Changes in Winter Wheat (Triticum aestivum L.) Induced by its Growth Temperature
Zhou Feng Wang, Wei Guo Liu and Rui Juan Hao
DOI : 10.3844/ajabssp.2017.18.27
American Journal of Agricultural and Biological Sciences
Volume 12, Issue 1
The nitrogen dynamics of plants can be quantified using the variation in their δ15N level. This reveals details of plant physiological characteristics and the relationship between plants and their growth conditions. To better understand plant nitrogen dynamics and the effects of external temperature changes on their nitrogen isotopic composition, we investigated the δ15N characteristics in Triticum aestivum and its mother soils during the plant's life cycle. We found that under field conditions, the plant's leaves and roots δ15N significantly changed. The δ15N values in Triticum aestivum changed from -1.6‰ to -8.1‰ for leaves and from -2.0‰ to -8.8‰ for roots, respectively. δ15N values for both, the leaves and roots were positively correlated with temperature. However, the foliar δ15N corresponded more strongly to air temperature, while the root δ15N corresponded to soil temperature. δ15N values of leaf and root both changed around 0.2‰ in response to a 1 degree change in temperature. Plant roots or shoot material cannot reflect the whole plant δ15N values due to a considerable difference between the δ15N values of root and leaf. However, the variations in leaf and root δ15N provide useful proxies to trace seasonal plant nitrogen cycles.
© 2017 Zhou Feng Wang, Wei Guo Liu and Rui Juan Hao. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.