Abstract
Summary Kaurene synthesis from copalyl pyrophosphate is present in the plastid fraction from all three sources of developing plant tissue studied. Isolated plastids from Echinocystis macrocarpa endosperm have kaurene synthetic capacity from either geranylgeranyl pyrophosphate or copalyl pyrophosphate. However, organelle preparations from etiolated pea shoot tips or developing castor bean endosperm have either no or a very limited ability to synthesize kaurene from geranylgeranyl pyrophosphate. These results suggest that the first committed step in gibberellin biosynthesis, geranylgeranyl pyrophosphate conversion to copalyl pyrophosphate, may be limited under certain stages of plant development.
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