Are field populations of arbuscular mycorrhizal fungi able to suppress the transmission of seed-borne Bipolaris sorokiniana to aerial plant parts?

Sjöberg, Johanna; Mårtensson, Anna; Persson, Paula

doi:10.1007/s10658-006-9067-7

Cited by 3 publications

(1 citation statement)

References 23 publications

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“…Mycorrhiza and root disease relationships regarding arbuscular mycorrhiza (AM) were the subject of many earlier studies (e.g. Dehne 1982, Linderman 1994, Azcón-Aguilar and Barea 1996 up to recent reports (Borowicz 2001, Whipps 2004, Fritz et al 2006, Sjöberg et al 2007, Steinkellner et al 2012. Also, in experiments with ectomycorrhizal fungi direct or indirect interactions with soil-borne root pathogens were demonstrated to be based on antibiosis, competition, or mechanisms of induced resistance leading to inhibition (reviewed in Marx 1972, Schönbeck et al 1994, Whipps 2004.…”

Section: Discussionmentioning

confidence: 99%

Interactions of ericoid mycorrhizal fungi and root pathogens in Rhododendron: <I>In vitro</I> tests with plantlets in sterile liquid culture

Grunewaldt-Stöcker¹,

Berg²,

Knopp³

et al. 2013

Plant Root

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Plant protection against soil-borne diseases has been a challenge in horticultural production of Ericaceae for a long time. We tested the hypothesis that ericoid mycorrhizal fungi (ERMF) control root pathogens. Isolates of ERMF previously obtained from Calluna vulgaris and Rhododendron hirsutum were selected based on growth inhibiting activity against Oomycetes in dual agar plate tests. In addition, we assessed their impact on economically important Pythium spec. and Phytophthora cinnamomi in sterile Rhododendron plantlets in a liquid culture system, which is suitable for continuous observations of the infection process. For this purpose, rooted cuttings of micro-propagated Rhododendron plantlets were transferred to a mineral solution and subsequently inoculated with either Oidiodendron maius or the ERMF isolates. Before the root pathogens were applied to the experimental system, the symbioses were established over a four-week period. Mycorrhizal development, pathogen infection sites and development in mycorrhizal plants and non-mycorrhizal control plants were assessed microscopically. The root-colonising intensity of the tested ERMF differed considerably, but each of the applied ERMF impaired external pathogen mycelium and reduced pathogenic infections. A complete reduction was achieved at higher ERMF colonisation levels. The failure of symbiosis formation allowed pathogens to infect and spread. The quantification data concerning mycorrhiza frequencies and extramatrical hyphal nets provided details for a discussion on the suppressive effects of ERMF on the pathogens. The tested ERMF confer at least a localized protection from pathogen attack through suppression prior to infection. It is now to prove, whether these biocontrol effects will also be expressed in pot experiments.

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Section: Discussionmentioning

confidence: 99%

Interactions of ericoid mycorrhizal fungi and root pathogens in Rhododendron: <I>In vitro</I> tests with plantlets in sterile liquid culture

Grunewaldt-Stöcker¹,

Berg²,

Knopp³

et al. 2013

Plant Root

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The Biological Control Possibilities of Seed-Borne Fungi

Özer

Coşkuntuna

2016

Fungal Biology

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Effects of plant pathogens on population dynamics and community composition in grassland ecosystems: two case studies

et al. 2013

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Grassland ecosystems comprise a major portion of the earth's terrestrial surface, ranging from high-input cultivated monocultures or simple species-mixtures to relatively unmanaged but dynamic systems. Plant pathogens are a component of these systems with their impact dependent on many interacting factors, including grassland species population dynamics and community composition, the topics covered in this paper. Plant pathogens are affected by these interactions and also act reciprocally by modifying their nature. We briefly review these features of disease in grasslands and then introduce the 150-year long-term Park Grass Experiment (PGE) at Rothamsted Research in the UK. We then consider in detail two plant-pathogen systems present in the PGE, Tragopogon pratensis-Puccinia hysterium and Holcus lanata-Puccinia coronata. These two systems have very different life history characteristics: the first, a biennial member of the Asteraceae infected by its host-specific, systemic rust; the second, a perennial grass infected by a host-nonspecific rust. We illustrate how observational, experimental and modelling studies can contribute to a better understanding of population dynamics, competitive interactions and evolutionary outcomes. With Tragopogon pratensis-Puccinia hysterium, characterised as an "outbreak" species in the PGE, we show that pathogen-induced mortality is unlikely to be involved in host population regulation; and that the presence of even a short-lived seed-bank can affect the qualitative outcomes of the host-pathogen dynamics. With Holcus lanata-Puccinia coronata, we show how nutrient conditions can affect adaptation in terms of host defence mechanisms, and that coexistence of competing species affected by a common generalist pathogen is unlikely.

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Are field populations of arbuscular mycorrhizal fungi able to suppress the transmission of seed-borne Bipolaris sorokiniana to aerial plant parts?

Cited by 3 publications

References 23 publications

Interactions of ericoid mycorrhizal fungi and root pathogens in Rhododendron: <I>In vitro</I> tests with plantlets in sterile liquid culture

Interactions of ericoid mycorrhizal fungi and root pathogens in Rhododendron: <I>In vitro</I> tests with plantlets in sterile liquid culture

The Biological Control Possibilities of Seed-Borne Fungi

Effects of plant pathogens on population dynamics and community composition in grassland ecosystems: two case studies

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