寄生植物和叢枝菌根（AM）真菌在陸地生態(tài)系統(tǒng)中廣泛分布,，兩者均為陸地生態(tài)系統(tǒng)的重要組成部分。國內(nèi)外關(guān)于這兩類生物有過大量廣泛而深入的研究,，但多數(shù)情況下僅關(guān)注兩者之一,。
近期研究顯示，AM真菌在宿主植物根部定殖的過程和根寄生植物對寄主植物的侵染過程可能具有相似的分子調(diào)控途徑,，兩種生物過程有諸多相似之處,。此外，逐步增多的研究表明,，寄主植物根部的AM真菌定殖水平對寄生植物生長發(fā)育有顯著影響,。然而，由于多數(shù)寄生植物無法形成菌根,，截止目前,，沒有關(guān)于寄生植物和AM真菌直接相互關(guān)系的研究報道,。
中國科學(xué)院昆明植物研究所科研人員聯(lián)合澳大利亞阿德萊德大學(xué)的科研人員,，利用一種兼具AM定殖能力的根部兼性半寄生植物（三色馬先蒿，Pedicularis tricolor Hand.-Mazz.）,，探討了根寄生植物和AM真菌的直接互作關(guān)系,。研究表明，接種AM真菌可強烈抑制寄生植物養(yǎng)分吸收器官（吸器）的發(fā)生,。相關(guān)論文在線發(fā)表于Annals of Botany,。
該研究首次證實了AM真菌對根寄生植物的吸器發(fā)生有直接而顯著的影響,，為寄生性雜草的生物防控提供了一條新思路。（生物谷 bioon.com）
doi:10.1093/aob/mcs028
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Inoculation with arbuscular mycorrhizal fungi suppresses initiation of haustoria in the root hemiparasite Pedicularis tricolor
Ai-Rong Li1,，Sally E. Smith,F. Andrew Smith,，Kai-Yun Guan
Background and Aims Plant parasitism and arbuscular mycorrhizal (AM) associations have many parallels and share a number of regulatory pathways. Despite a rapid increase in investigations addressing the roles of AM fungi in regulating interactions between parasitic plants and their hosts, few studies have tested the effect of AM fungi on the initiation and differentiation of haustoria, the parasite-specific structures exclusively responsible for host attachment and nutrient transfer. In this study, we tested the influence of AM fungi on haustorium formation in a root hemiparasitic plant. Methods Using a facultative root hemiparasitic species (Pedicularis tricolor) with the potential to form AM associations, the effects of inoculation were tested with two AM fungal species, Glomus mosseae and Glomus intraradices, on haustorium initiation in P. tricolor grown alone or with Hordeum vulgare ‘Fleet’ (barley) as the host plant. This study consisted of two greenhouse pot experiments. Key Results Both AM fungal species dramatically suppressed intraspecific haustorium initiation in P. tricolor at a very low colonization level. The suppression over-rode inductive effects of the parasite's host plant on haustoria production and caused significant growth depression of P. tricolor. Conclusions AM fungi had strong and direct suppressive effects on haustorium formation in the root hemiparasite. The significant role of AM fungi in haustorium initiation of parasitic plants was demonstrated for the first time. This study provides new clues for the regulation of haustorium formation and a route to development of new biocontrol strategies in management of parasitic weeds.
