Photosynthetica 1999, 36(14):615-619 | DOI: 10.1023/A:1007131827115

Flavonoid Responses in Wheat Grown at Elevated CO2: Green Versus Senescent Leaves

J. Peñuelas1, M. Estiarte1, B.A. Kimball2
1 Center of Ecological Research and Forestry Applications (CREAF), Facultat de Ciències, Universitat Autònoma de Barcelona, Bellaterra, Spain
2 U.S. Water Conservation Laboratory, USDA, Agricultural Research Service, Phoenix, USA

We compared flavonoids in green, mature, and senescing flag leaves of wheat grown under ambient (AC - 370 μmol mol-1) and elevated (EC - 550 μmol mol-1) concentrations of CO2 in a FACE (Free Air CO2 Enrichment) system. The concentrations of flag leaf flavonoids (e.g., isoorientin and tricin) decreased to one third in mature leaves, and the majoritary isoorientin almost disappeared in senescing leaves. Flavonoid concentrations increased in green well-developed flag leaves under EC (46 % isoorientin and 55 % tricin), whereas the differences disappeared in mature and senescing flag leaves. Predictions of changes in litter phenolic concentrations and their effects on decomposition rates under EC based on changes in green leaves need to be revised.

Additional key words: carbon based secondary compounds (CBSC); isoorientin; leaf age; litter; phenolics; tricin; Triticum aestivum

Prepublished online: December 1, 2000; Published: December 31, 1999  Show citation

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Peñuelas, J., Estiarte, M., & Kimball, B.A. (1999). Flavonoid Responses in Wheat Grown at Elevated CO2: Green Versus Senescent Leaves. Photosynthetica, 37(4), 615-619. doi: 10.1023/A:1007131827115
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