Abstract
Barley plants infected with brown rust at the first leaf stage showed reduced growth over the following 16 days. This could be accounted for entirely by reduced net photosynthesis of, and transport from, the infected leaf. Diseased leaves had reduced net photosynthesis, increased dark and photo-respiration and slightly decreased stomatal resistance. A treatment of photosynthesis as a diffusion process showed a doubling of mesophyll resistance, calculated on a total leaf area basis, following disease. The utility of diffusion models in rusted leaves is discussed.
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