Abstract
The influence of the photosystem II-herbicide bentazon on the ultrastructure of chloroplasts of radish seedlings (Raphanus sativus L.) was investigated with special emphasis on thylakoid development and grana formation. Bentazon application (10-3 ᴍ) induces the formation of broader and higher grana stacks (grana width: 0.5-0.6 μm; greatest frequency: 3-8 thylakoids per granum) than in the control plants (grana width: 0.3 μm; greatest frequency: 2-4 thylakoids per granum). Furthermore, the amount of chloroplast lamellae is enhanced, as are the stacking degree of thylakoids and the grana area. The chloroplasts of bentazon-treated plants appear to be shorter and thicker than in the controls and show all signs of a shade-type adaptation of the photosynthetic apparatus.
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