State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing, China.
New Phytol. 2010 Aug;187(3):859-66. doi: 10.1111/j.1469-8137.2010.03316.x. Epub 2010 Jun 7.
*Recent studies have investigated the relationships between pairs or groups of exotic species to illustrate invasive mechanisms, but most have focused on interactions at a single trophic level. *Here, we conducted pathogenicity tests, analyses of host volatiles and fungal growth tests to elucidate an intricate network of interactions between the host tree, the invasive red turpentine beetle and its fungal associates. *Seedlings inoculated with two strains of Leptographium procerum isolated from Dendroctonus valens in China had significantly longer lesions and higher mortality rates than seedlings inoculated with other fungal isolates. These two strains of L. procerum were significantly more tolerant of 3-carene than all other fungi isolated there, and the infection of Chinese pine (Pinus tabuliformis) seedlings by these two strains enhanced the production and release of 3-carene, the main attractant for D. valens, by the seedlings. *Our results raise the possibility that interactions among the fungal associates of D. valens and their pine hosts in China may confer advantages to these strains of L. procerum and, by extension, to the beetles themselves. These interactions may therefore enhance invasion by the beetle-fungal complex.
*近期研究调查了成对或成组的外来物种之间的关系，以阐明入侵机制，但大多数研究都集中在单一营养级的相互作用上。*在这里，我们进行了致病性测试、宿主挥发物分析和真菌生长测试，以阐明宿主树、入侵的红松象鼻虫及其真菌伴生物之间错综复杂的相互作用网络。*从中国的红脂大小蠹中分离出的两种Leptographium procerum 菌株接种的幼苗的病变长度和死亡率明显高于接种其他真菌分离物的幼苗。这两种菌株对 3-蒈烯的耐受性明显高于其他所有在那里分离出的真菌，并且这两种菌株感染中国松树（Pinus tabuliformis）幼苗会增强 3-蒈烯的产生和释放，3-蒈烯是红脂大小蠹的主要引诱剂。*我们的结果表明，红脂大小蠹及其松属宿主的真菌伴生物之间的相互作用可能为这些 Leptographium procerum 菌株以及更广泛地为象鼻虫本身带来优势。因此，这些相互作用可能会增强象鼻虫-真菌复合体的入侵。
