文章基本信息

标题：Nitrogen assimilation and growth of wheat under elevated carbon dioxide
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作者：Arnold J. Bloom ; David R. Smart ; Duy T. Nguyen 等
期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：2002
卷号：99
期号：3
页码：1730-1735
DOI：10.1073/pnas.022627299
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：Simultaneous measurements of CO2 and O2 fluxes from wheat (Triticum aestivum) shoots indicated that short-term exposures to elevated CO2 concentrations diverted photosynthetic reductant from NO[IMG]f1.gif" ALT="Formula" BORDER="0"> or NO[IMG]f2.gif" ALT="Formula" BORDER="0"> reduction to CO2 fixation. With longer exposures to elevated CO2, wheat leaves showed a diminished capacity for NO[IMG]f1.gif" ALT="Formula" BORDER="0"> photoassimilation at any CO2 concentration. Moreover, high bicarbonate levels impeded NO[IMG]f2.gif" ALT="Formula" BORDER="0"> translocation into chloroplasts isolated from wheat or pea leaves. These results support the hypothesis that elevated CO2 inhibits NO[IMG]f1.gif" ALT="Formula" BORDER="0"> photoassimilation. Accordingly, when wheat plants received NO[IMG]f1.gif" ALT="Formula" BORDER="0"> rather than NH[IMG]f3.gif" ALT="Formula" BORDER="0"> as a nitrogen source, CO2 enhancement of shoot growth halved and CO2 inhibition of shoot protein doubled. This result will likely have major implications for the ability of wheat to use NO[IMG]f1.gif" ALT="Formula" BORDER="0"> as a nitrogen source under elevated CO2.