期刊
JOURNAL OF EXPERIMENTAL BOTANY
卷 70, 期 2, 页码 683-690出版社
OXFORD UNIV PRESS
DOI: 10.1093/jxb/ery371
关键词
Ammonium; carbon dioxide; N-2 fixation; nitrate; photo-reduction of nitrate; urea
Atmospheric carbon dioxide concentration ([CO2]) increased from around 280 ppm in 1750 to 400 ppm in 2016 and is likely to continue to increase throughout this century. It has been argued that wheat, Arabidopsis, and C-3 plants in general respond more positively to elevated atmospheric [CO2] under ammonium (NH4+) nutrition than under nitrate (NO3-) nutrition because elevated CO2 inhibits their photoreduction of NO3- and hence reduces their total plant nitrogen (N) assimilation and ultimately growth. Here, it is argued that the weight of evidence in the literature indicates that elevated atmospheric [CO2] does not inhibit NO3- assimilation and growth of C-3 vascular plants. New data for common bean and wheat support this view and indicate that the effects of elevated atmospheric [CO2] on N assimilation and growth of C-3 vascular plants will be similar regardless of the form of N assimilated.
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