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Environmental and Stress Physiology

Downward Regulation of Photosynthesis and Growth at High CO₂ Levels ¹

No Evidence for Either Phenomenon in Three-Year Study of Sour Orange Trees

U.S. Water Conservation Laboratory, Phoenix, Arizona 85040

Numerous photosynthesis and growth measurements of sour orange (Citrus aurantium L.) trees maintained in ambient air and air enriched with an extra 300 microliters per liter of CO₂ have revealed the CO₂-enriched trees to have consistently sequestered approximately 2.8 times more carbon than the control trees over a period of three full years. Under field conditions in the natural environment, plants may not experience the downward regulation of photosynthetic capacity typically observed in long-term CO₂ enrichment experiments with plants growing in pots.

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