Photosynthesis and chloroplast functioning in leaves of barley hordeum vulgare cultivar maris mink infected with brown rust

Ahmad, I.; Farrar, J.F.; Whitbread, R.

Physiological Plant Pathology 23(3): 411-420


Accession: 006111981

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The rate of net photosynthesis is reduced in leaves of barley infected with brown rust. This reduction is not due to reduced CO2 fixation per chloroplast, but is ascribed to a decrease in the number of functional chloroplasts. Chloroplasts isolated from diseased leaves show increased contents of starch and P, and unaltered rates of ferricyanide-dependent O2 evolution, as compared with controls. Fluxes through the phosphate translocator on the chloroplast inner envelope are higher in diseased leaves. The kinetics of in vivo chlorophyll fluorescence induction are described; while they change with leaf age in control leaves, in diseased leaves the juvenile kinetics are retained. Each surviving chloroplast in diseased leaves is functioning at least as well as those from healthy leaves.