Differences in the constitutive terpene profile of lodgepole pine across a geographical range in British Columbia, and correlation with historical attack by mountain pine beetle
Differences in the constitutive terpene profile of lodgepole pine across a geographical range in British Columbia, and correlation with historical attack by mountain pine beetle
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DOI：
10.4039/n10-022
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发表时间：
2010-11-01
影响因子：
0.9
通讯作者：
Huber, Dezene P. W.
中科院分区：
文献类型：
--
作者：
Clark, Erin L.;Carroll, Allan L.;Huber, Dezene P. W.
美国松大小蠹（Dendroctonus ponderosae霍普金斯）是我国西部新北地区针叶林的一种重要害虫。目前，不列颠哥伦比亚省，加拿大，正在经历最大的记录爆发这种昆虫，包括地区，历史上有低的气候适宜性it.We分析了26个组成树脂萜烯韧皮部样品从不列颠哥伦比亚省黑松（松contorta）种群测试差异抵抗山松甲虫攻击，根据以前暴露于山松甲虫的可能性。我们评估抽样树木的数量山松甲虫的攻击，蛹室的数量，树木的生存第二年春天。显着差异时，发现在小松松种群，可能经历了大量的山松甲虫在过去的侵扰的某些萜烯的水平进行了比较，可能没有经历过大爆发的山松甲虫的人口。虽然我们预计南方松树种群含有更多的总萜烯比北方人口，由于较高的历史暴露于甲虫，匡威的发现。北方人口一般有较高水平的组成萜烯和甲虫攻击比南方人口。由于几种萜烯是山松甲虫的利它素，也可以作为合成信息素的前体，因此来自山松甲虫历史范围的短柱松表达的较低水平的萜烯可能使它们对觅食甲虫的化学感知降低。
The mountain pine beetle, Dendroctonus ponderosae Hopkins (Coleoptera: Curculionidae), is a destructive insect pest in western Nearctic conifer forests. Currently, British Columbia, Canada, is experiencing the largest recorded outbreak of this insect, including areas that historically have had low climatic suitability for it. We analyzed 26 constitutive resin terpenes in phloem samples from British Columbia lodgepole pine (Pinus contorta) populations to test for differential resistance to mountain pine beetle attack, based upon the likelihood of previous exposure to mountain pine beetle. We assessed sampled trees for number of mountain pine beetle attacks, number of pupal chambers, and tree survival the following spring. Significant differences were found when levels of certain terpenes in lodgepole pine populations that had likely experienced substantial mountain pine beetle infestations in the past were compared with those in populations that likely had not experienced large outbreaks of mountain pine beetle. Although we expected southern pine populations to contain more total terpenes than northern populations, owing to higher historical exposure to the beetle, the converse was found. Northern populations generally had higher levels of constitutive terpenes and beetle attack than southern populations. Because several terpenes are kairomones to the mountain pine beetle and also serve as precursors for the synthesis of pheromones, the lower levels of terpenes expressed by lodgepole pines from the historical range of the mountain pine beetle may render them less chemically perceptible to foraging beetles.