Characteristics of a photorespiratory mutant of barley (Hordeum vulgare L.) deficient in phosphogly collate phosphatase

A barley mutant RPr84/90 has been isolated by selecting for plants which grow poorly in natural air, but normally in air enriched to 0.8% CO2. After 5 minutes of photosynthesis in air containing14CO2 this mutant incorporated 26% of the14C carbon into phosphoglycollate, a compound not normally labelled in wild type (cv. Maris Mink) leaves.