Abstract

Barley plants ( Hordeum vulgare L.) were grown in nutrient culture. Leaves were harvested at intervals after plants were inoculated with bromegrass mosaic virus. The rate of respiration of whole leaves, based on Warburg's direct method, increased shortly after inoculation, then decreased and increased again just before symptoms appeared, and remained above that of healthy plants throughout the remainder of the experimental period. The increase appeared not to be associated with uncoupling of phosphorylation by the virus, and probably not with increased available substrate. The succinoxidase activity of mitochondrial preparations was decreased by virus infection, indicating mitochondrial alterations of some kind.

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