Journal Article

Foliage nitrogen turnover: differences among nitrogen absorbed at different times by <i>Quercus serrata</i> saplings

Miki U. Ueda, Eri Mizumachi and Naoko Tokuchi

in Annals of Botany

Published on behalf of The Annals of Botany Company

Volume 108, issue 1, pages 169-175
Published in print July 2011 | ISSN: 0305-7364
Published online April 2011 | e-ISSN: 1095-8290 | DOI: http://dx.doi.org/10.1093/aob/mcr092
Foliage nitrogen turnover: differences among nitrogen absorbed at different times by Quercus serrata saplings

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  • Ecology and Conservation
  • Evolutionary Biology
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Background and Aims

Nitrogen turnover within plants has been intensively studied to better understand nitrogen use strategies. However, differences among the nitrogen absorbed at different times are not completely understood and the fate of nitrogen absorbed during winter is largely uncharacterized. In the present study, nitrogen absorbed at different times of the year (growing season, winter and previous growing season) was traced, and the within-leaf nitrogen turnover of a temperate deciduous oak Quercus serrata was investigated.

Methods

The contributions of nitrogen absorbed at the three different times to leaf construction, translocation during the growing season, and the leaf-level resorption efficiency during leaf senescence were compared using 15N.

Key Results

Winter- and previous growing season-absorbed nitrogen significantly contributed to leaf construction, although the contribution was smaller than that of growing season-absorbed nitrogen. On the other hand, the leaf-level resorption efficiency of winter- and previous growing season-absorbed nitrogen was higher than that of growing season-absorbed nitrogen, suggesting that older nitrogen is better retained in leaves than recently absorbed nitrogen.

Conclusions

The results demonstrate that nitrogen turnover in leaves varies with nitrogen absorption times. These findings are important for understanding plant nitrogen use strategies and nitrogen cycles in forest ecosystems.

Keywords: Cell wall; 15N; leaf; nitrogen resorption efficiency; oak; Quercus serrata; winter

Journal Article.  4599 words.  Illustrated.

Subjects: Ecology and Conservation ; Evolutionary Biology ; Plant Sciences and Forestry

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