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

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

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Soybean seedlings were grown in controlled environment chambers with CO2 partial pressures of 38 (ambient) and 72 (elevated) Pa.Five or six shoot apices were harvested from individual 21- to 24-day-old plants.Metabolites were analyzed by gas chromatography and, out of 21 compounds, only sucrose and fructose increased in response to CO2 enrichment.One unidentified First Aid metabolite, Unk-21.

03 decreased up to 80% in soybean apices in response to elevated CO2.Levels of Unk-21.03 decreased progressively when atmospheric CO2 partial pressures were increased from 26 to 100 Pa.Reciprocal transfer experiments showed that Unk-21.

03, and sucrose in soybean apices were altered slowly over several days to changes in atmospheric CO2 partial pressures.The mass spectrum of Unk-21.03 indicated that this compound likely contained both an amino and carboxyl group and was structurally related to serine and aspartate.Our findings suggested that CO2 enrichment altered a Toothbrushes- Power And Manual small number of specific metabolites in soybean apices.

This could be an important step in understanding how plant growth and development are affected by carbon dioxide enrichment.