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Improved nitrogen nutrition enhances root uptake, root-to-shoot translocation and remobilization of zinc (⁶⁵Zn) in wheat

Emin Bulent Erenoglu, Umit Baris Kutman, Yasemin Ceylan, Bahar Yildiz and Ismail Cakmak
The New Phytologist
Vol. 189, No. 2 (January 2011), pp. 438-448
Published by: Wiley on behalf of the New Phytologist Trust
Stable URL: http://www.jstor.org/stable/40983845
Page Count: 11
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Improved nitrogen nutrition enhances root uptake, root-to-shoot translocation and remobilization of zinc (⁶⁵Zn) in wheat
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Abstract

This study focussed on the effect of increasing nitrogen (N) supply on root uptake and root-to-shoot translocation of zinc (Zn) as well as retranslocation of foliar-applied Zn in durum wheat (Triticum durum). Nutrient solution experiments were conducted to examine the root uptake and root-to-shoot translocation of ⁶⁵Zn in seedlings precultured with different N supplies. In additional experiments, the effect of varied N nutrition on retranslocation of foliar-applied ⁶⁵Zn was tested at both the vegetative and generative stages. When N supply was increased, the ⁶⁵Zn uptake by roots was enhanced by up to threefold and the ⁶⁵Zn translocation from roots to shoots increased by up to eightfold, while plant growth was affected to a much smaller degree. Retranslocation of ⁶⁵Zn from old into young leaves and from flag leaves to grains also showed marked positive responses to increasing N supply. The results demonstrate that the N-nutritional status of wheat affects major steps in the route of Zn from the growth medium to the grain, including its uptake, xylem transport and remobilization via phloem. Thus, N is a critical player in the uptake and accumulation of Zn in plants, which deserves special attention in biofortification of food crops with Zn.

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