Abstract
Barley (Hordeum vulgare L. cv. Digger) was grown for 22 d in enclosed chambers with a C02 enrichment of 35, 155, 400 or 675/?mol C02 mol'1. C02 enrichment increased photosynthetic capacity in the plants grown at either of the two highest levels of pC02. A C02 enrichment of 675 //mol C02 caused a significant increment of shoot dry weight, whereas no changes were observed in fresh weight, chlorophyll or protein levels. At a light intensity of 860//mol m'2s~1 C02 enrichment caused photosynthetic capacity to increase by 250%, whereas no effect was observed at 80 //mol m~2 s~1. Over time, photosynthesis decreased by 70% independent of C02. A time-dependent increase in the level of extractable fructose was observed whereas total extractable carbohydrate only changed slightly.
Published Version
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