Abstract
Long-chain polyprenols, consisting of 10–70 cis-isoprene units present in latex of the nascent Hevea shoots, were characterized, to elucidate the initiator of rubber biosynthesis. Long-chain polyprenols consisting of 10–70 cis-isoprene units are present in the latex of nascent leaves of young Hevea shoots. A continuous chain-length distribution was observed in these polyprenols, as commonly found in polyprenols isolated from other higher plants. 13C NMR analysis showed that they contained no ω-dimethylallyl-group at the initiating end, as is the case with the high and low M r rubber from Hevea. This finding supports the assumption that the initiating species in the biosynthesis of rubber and polyprenols in Hevea is not trans- trans-farnesyl-diphosphate ( t, t-FDP) but an FDP, in which the dimethylallyl-group is modified. Alternatively, the initiator is t, t-FDP and the dimethylallyl-group is changed after polymerization.
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