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. 2019 Feb 13;70(6):1859–1873. doi: 10.1093/jxb/erz047

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© The Author(s) 2019. Published by Oxford University Press on behalf of the Society for Experimental Biology.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Fig. 9. — A model explaining the promoting effect of mixed N form on maize growth. The thick arrows represent promoting effect. The thin arrows represent not promoting. The dotted arrows represent positive feedback regulation. On one hand, mixed N supply increases C source by promoting photosynthesis rate. On the other hand, mixed N supply enhances auxin synthesis via shikimate pathway so as to increased leaf area. As a result, C utilization is enhanced, which exerts a positive feedback regulation effect on photosynthetic rate, N assimilation, and N uptake.