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Contribution of Arginine to Proline Accumulation in Water-stressed Barley Leaves ¹

Cecil R. Stewart^b

^a Department of Agronomy, University of Illinois, Urbana, Illinois 61801, Department of Botany and Plant Pathology, Iowa State University, Ames, Iowa 50010

Barley (Hordeum vulgare cv Prior) leaves converted L-U-¹⁴C-arginine to labeled proline. Accumulation of radioactivity in proline was greater in wilted leaves, but only after 9 hours of incubation. As the increase in free proline was detectable after only 3 to 6 hours, it is likely that the observed stimulation of proline labeling represents a result rather than a cause of proline accumulation. Furthermore, the loss of total arginine during water stress was only 10 to 15% of the increase in proline. We conclude that arginine probably contributes less than 1% of the carbon in the expanding proline pool of wilted barley leaves.