Inoculation with arbuscular mycorrhizal fungi suppresses initiation of haustoria in the root hemiparasite Pedicularis tricolor
Inoculation with arbuscular mycorrhizal fungi suppresses initiation of haustoria in the root hemiparasite Pedicularis tricolor
复制标题
接种丛枝菌根真菌可抑制根部半寄生三色马先蒿中吸器的启动
DOI：
10.1093/aob/mcs028
复制
发表时间：
2012-05-01
期刊：
影响因子：
4.2
通讯作者：
Guan, Kai-Yun
中科院分区：
文献类型：
--
作者：
Li, Ai-Rong;Smith, Sally E.;Guan, Kai-Yun
植物寄生和丛枝菌根（AM）协会有许多相似之处，并共享一些调控途径。尽管研究AM真菌在调节寄生植物与其宿主之间相互作用中的作用的研究迅速增加，但很少有研究测试AM真菌对吸器的起始和分化的影响，吸器是专门负责宿主附着和营养转移的寄生物特异性结构。本研究以兼性根半寄生植物三色马先蒿（Pedicularis tricolor）为材料，研究了接种Glomus mosseae和Glomus intraradices对三色马先蒿吸器形成的影响。本研究通过两个温室盆栽试验，发现两种AM真菌在极低的定殖水平下都能显著抑制三色青霉种内吸器的启动。这种抑制作用超过了寄主植物对吸器形成的诱导作用，导致三色青霉生长受到明显抑制，AM真菌对根半寄生物吸器形成有强烈的直接抑制作用。首次证实了AM真菌在寄生植物吸器发生中的重要作用。本研究为寄生性杂草吸器形成的调控提供了新的线索，也为寄生性杂草的生物防治提供了新的思路。
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.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 oFleet' (barley) as the host plant. This study consisted of two greenhouse pot experiments.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 parasites host plant on haustoria production and caused significant growth depression of P. tricolor.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.