Long-chain polyprenols and rubber in young leaves of Hevea brasiliensis

被引：25

作者：

Tangpakdee, J ^{[1
]}

Tanaka, Y ^{[1
]}

机构：

[1] Tokyo Univ Agr & Technol, Fac Technol, Dept Appl Chem, Koganei, Tokyo 184, Japan

来源：

PHYTOCHEMISTRY | 1998年 / 48卷 / 03期

关键词：

Hevea brasiliensis; Euphorbiaceae; long-chain polyprenols; rubber biosynthesis; terminal groups;

D O I：

10.1016/S0031-9422(98)00021-1

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

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. C-13, NMR analysis showed that they contained no omega-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 tr tms-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. (C) 1998 Elsevier Science Ltd. All rights reserved.

引用

页码：447 / 450

页数：4

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