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Photoinduced ph changes measured by antimony microelectrode in suspensions of chloroplasts isolated from healthy and powdery mildew infected barley


Biologia (Bratislava) 43(3): 219-224
Photoinduced ph changes measured by antimony microelectrode in suspensions of chloroplasts isolated from healthy and powdery mildew infected barley
Photoinduced pH changes, measured by an antimony microelectrode, in chloroplast suspensions from healthy barley showed two phases: acidification and alkalification. The first phase, acidification, evidently reflects a direct connection between the inside of thylakoids and external environment through the surface membrane of the chloroplasts. The subsequent alkalification was inhibited by acetazole amide, an inhibitor of carboxyl anhydrase, suggesting that it reflects CO2 absorption by chloroplasts. The alkalification phase of photoinduced pH changes in suspensions of chloroplasts from powdery mildew-infected plants was not marked. A similar effect was produced by treating chloroplasts from healthy barley with an extract from infected plants. These measurements point to a partial inhibition of CO2 fixation in barley protoplasts due to powdery mildew infection. The possible mechanisms of this inhibition were discussed.

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Accession: 006110843



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