Abstract
Summary Polyacrylamide gel electrophoresis revealed a specific reduction or elimination of plastid 1.1 and 0.56 - 10 6 mol.wt. rRNA in chlorotic leaf segments of amitrole-treated, light-grown oat plants, while cytoplasmic rRNAs remained unaffected. Dark-grown amitrole-treated oat seedlings and untreated controls gave similar electrophoretic patterns of rRNA with about 30% plastid rRNA. The chloroplast rRNA content decreased after the appearance of chlorotic symptoms. Incorporation experiments with 32 P i indicated an unaffected de novo synthesis of plastid RNA in amitrole-induced chlorotic leaf sections. We suggest an increased rate of plastid rRNA degradation as a result of the toxic actions of amitrole during the light-dependent plastid development.
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