期刊
ANNALS OF BOTANY
卷 109, 期 6, 页码 1075-1080出版社
OXFORD UNIV PRESS
DOI: 10.1093/aob/mcs028
关键词
Root hemiparasite; Pedicularis tricolor; Orobanchaceae; arbuscular mycorrhizal fungi; initiation of haustoria; Hordeum vulgare oFleet'; Glomus mosseae; Glomus intraradices
资金
- Natural Science Foundation of China [30970288]
- Natural Science Foundation of Yunnan Province [2009CD114]
- Chinese Academy of Sciences
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.
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