4.6 Article

Direct and indirect influences of arbuscular mycorrhizal fungi on phosphorus uptake by two root hemiparasitic Pedicularis species: do the fungal partners matter at low colonization levels?

期刊

ANNALS OF BOTANY
卷 112, 期 6, 页码 1089-1098

出版社

OXFORD UNIV PRESS
DOI: 10.1093/aob/mct177

关键词

Arbuscular mycorrhizal fungi; Glomus; Hordeum vulgare; barley; Orobanchaceae; Pedicularis rex; P; tricolor; phosphorus uptake; root hemiparasitic plant

资金

  1. Natural Science Foundation of China [30970288]
  2. Natural Science Foundation of Yunnan Province [2009CD114]
  3. Youth Innovation Promotion Association of the Chinese Academy of Sciences (CAS)
  4. Overseas Training Program from the CAS
  5. University of Adelaide
  6. Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, CAS [P2012-KF03]

向作者/读者索取更多资源

Because most parasitic plants do not form mycorrhizal associations, the nutritional roles of arbuscular mycorrhizal (AM) fungi in them have hardly been tested. Some facultative root hemiparasitic Pedicularis species form AM associations and hence are ideal for testing both direct and indirect effects of AM fungi on their nutrient acquisition. The aim of this study was to test the influence of AM inoculation on phosphorus (P) uptake by Pedicularis rex and P. tricolor. P-32 labelling was used in compartmented pots to assess the contribution of the AM pathway and the influence of AM inoculation on P uptake from a host plant into the root hemiparasites. Laboratory isolates of fungal species (Glomus mosseae and G. intraradices) and the host species (Hordeum vulgare Fleet) to which the two Pedicularis species showed obvious responses in haustorium formation and growth in previous studies were used. The AM colonization of both Pedicularis spp. was low (15 root length) and only a very small proportion of total plant P (1 ) was delivered from the soil via the AM fungus. In a separate experiment, inoculation with AM fungi strongly interfered with P acquisition by both Pedicularis species from their host barley, almost certainly because the numbers of haustoria formed by the parasite were significantly reduced in AM plants. Roles of AM fungi in nutrient acquisition by root parasitic plants were quantitatively demonstrated for the first time. Evidence was obtained for a novel mechanism of preventing root parasitic plants from overexploiting host resources through AM fungal-induced suppression of the absorptive structures in the parasites.

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