Roelofs W L, Jurenka R A
Department of Entomology, NYS Agricultural Experiment Station, Cornell University, Geneva, NY 14456, USA.
Bioorg Med Chem. 1996 Mar;4(3):461-6. doi: 10.1016/0968-0896(96)00026-0.
Changes in key enzymes in the biosynthetic pathways of sex pheromone components can produce differences in component ratios and structures. The sex pheromone communication system is critical to reproduction and the maintenance of a species and so changes in this system can play a major role in the speciation process. Artificial selection of female redbanded leafroller moths that produced either higher or lower ratios of 14-/12-carbon pheromone components was used to study how the biosynthetic pathways were affected in the high and low populations. The results showed that the chain shortening enzymes were selective for the (E) isomer and so left the 14-carbon acyl intermediates enriched in the (Z) isomer. Thus, the high population, which has a higher amount of 12-carbon components, also has a lower ratio of E11-/Z11-14:OAc pheromone components. The data also suggested that chain shortening occurred prior to reduction and acetylation of the 14-carbon components. These changes are not sufficient to isolate the redbanded leafroller populations, but we discuss some cases where significant changes in pheromone component ratios are affected by the chain-shortening enzymes.
性信息素成分生物合成途径中关键酶的变化会导致成分比例和结构的差异。性信息素通讯系统对于物种的繁殖和维持至关重要，因此该系统的变化在物种形成过程中可能起主要作用。通过人工选择产生高或低比例的14碳/12碳性信息素成分的雌性红带卷叶蛾，来研究生物合成途径在高比例和低比例种群中是如何受到影响的。结果表明，链缩短酶对（E）异构体具有选择性，因此使富含（Z）异构体的14碳酰基中间体得以保留。因此，具有较高含量12碳成分的高比例种群，其E11-/Z11-14:OAc性信息素成分的比例也较低。数据还表明，链缩短发生在14碳成分的还原和乙酰化之前。这些变化不足以使红带卷叶蛾种群隔离，但我们讨论了一些性信息素成分比例的显著变化受链缩短酶影响的情况。
