Responses of Metabolites in Soybean Shoot Apices to Changing Atmospheric Carbon Dioxide Concentrations

Figure 3

Total ion chromatogram showing changes of an unidentified compound (Unk-21.03) that decreased in soybean apices in response to CO₂ enrichment. Chromatograms were prepared with similar amounts of extracts of soybean apices from the ambient (a) and elevated (b) CO₂ treatments. The unidentified compound eluted from the column at 21.03 minutes and is marked with a descending arrow. Values are means ± SE (n = 8).

(a)   36 Pa CO₂

(b) 72 Pa CO₂