外來入侵物種的入侵機制是入侵生物學的核心科學問題,。已有假說主要從天敵、資源和生態(tài)位幾方面闡述了入侵種的入侵性,。但是現(xiàn)有的入侵理論只能解釋部分入侵物種的入侵性,，所以新的入侵理論令人期待。
2006年至今,，中科院動物研究所孫江華研究組以紅脂大小蠹－伴生菌為研究模型,，以多物種協(xié)同作用為切入點，開展了紅脂大小蠹入侵機制的研究,，繼2007年提出外來種與本地種種間協(xié)同入侵后,，最近又提出了紅脂大小蠹伴生菌L. procerum的共生入侵機制。
一方面,，中國紅脂大小蠹伴生菌L. procerum通過降低寄主油松抗性和誘導寄主油松產(chǎn)生紅脂大小蠹聚集化合物（3-carene）來協(xié)助紅脂大小蠹在入侵地中國的侵入,；另一方面，中國紅脂大小蠹通過攜帶其伴生菌L. procerum和誘導寄主油松產(chǎn)生抑制其它伴生菌生長的化合物來協(xié)助中國紅脂大小蠹伴生菌L. procerum在入侵地中國的侵入,。由此從蟲－菌種間協(xié)同,、蟲－寄主相互作用、菌－寄主相互作用和菌－菌種間競爭4個方面驗證了紅脂大小蠹與其中國伴生菌L. procerum的共生關(guān)系在入侵地的發(fā)展和保持，從而說明紅脂大小蠹及其中國伴生菌L. procerum的入侵性,。最終提出新的入侵模式——共生入侵,。部分數(shù)據(jù)在線發(fā)表在植物學期刊New Phytologist上。
該研究得到國家基金委杰出青年科學基金（30525009）和中科院相關(guān)資助,。（生物谷Bioon.com）
生物谷推薦原文出處：
New Phytologist DOI：10.1111/j.1469-8137.2010.03316.x
Complex interactions among host pines and fungi vectored by an invasive bark beetle
Min Lu 1 , Michael J. Wingfield 2 , Nancy E. Gillette 3 , Sylvia R. Mori 3 and Jiang-Hua Sun 1
1 State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China ; 2 Tree Protection Co-operation Programme, Forestry and Agricultural Biotechnology Institute, University of Pretoria, Pretoria 0002, South Africa ; 3 PSW Research Station, USDA Forest Service, Berkeley, CA 94701, USA
ABSTRACT
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.
