Abstract
Penicillin induces the synthesis of cr-amylase in embryoless rice endosperm and enhances the gibberellin-induced response. Penicillin induction of cr-amylase can be prevented by inhibitors of nucleic acid and protein synthesis, CCC and 2,4-DNP. A characteristic gibbereliin-like activity in the extracts from penicillin-treated endosperms becomes detectable after 12 h from the addition of penicillin. This gibbereliin-like activity is located on paper chromatograms at the RT typical for GA3 and its formation is blocked by CCC, an inhibitor of G A biogenesis. Glucose has no effect on the biosynthesis of either gibberellin or cr amylase induced by penicillin. The time-course study of the levels of different constituents shows that penicillin probably induces RNA and DNA synthesis in the first place, which results in gibberellin biosynthesis, which in turn stimulates the synthesis of cr-amylase. The possible mode of action of penicillin in higher plants is discussed.
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