Coinoculation of aseptically grown Douglas fir with pairs of ectomycorrhizal fungi

Parladé, Javier; Álvarez, Isabel F.

doi:10.1007/bf00210699

Cited by 38 publications

(16 citation statements)

References 20 publications

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“…In the multi-species treatments, seedlings had shoot biomasses and leaf nitrogen that were often somewhat lower than their respective single-species treatments. These findings are consistent with other studies showing that co-colonization does not typically increase seedling growth or nitrogen uptake (Chu-Chou & Grace 1985;Parlade & Alvarez 1993;Baxter & Dighton 2001; but see Reddy & Natajaran 1997) and suggest that competition may negatively affect the ability of ECM fungi to provide resources to their host plants. If, for example, fungi invest in nitrogen-based defensive compounds used for direct antagonistic interactions, they may provide less nitrogen to their host.…”

Section: Host Plant Performancesupporting

confidence: 92%

Competitive interactions among three ectomycorrhizal fungi and their relation to host plant performance

et al. 2007

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Summary 1.Competition strongly influences many species assemblages, but its role in mycorrhizal fungal interactions is not well understood. We examined interactions among three ectomycorrhizal (ECM) species to determine if the structure of competition could be characterized by either competitive networks (where no clear hierarchy exists in the outcome of competition between various species pairs) or competitive hierarchies (where one species out competes all other species). Using a bioassay experiment, we inoculated Pinus muricata seedlings with threeRhizopogon species ( R. occidentalis , R. salebrosus , and R. vulgaris ) in single-, two-, and three-species treatments. After 7 months, we assessed the relative abundance of each species in each treatment using real-time PCR of internal transcribed spacer rDNA. 3. We found that R. occidentalis was strongly inhibited by R. vulgaris and R. salebrosus in all competition treatments. In contrast, R. vulgaris and R. salebrosus had similar ECM biomasses in the two-species treatment, but R. vulgaris had significantly higher biomass than R. salebrosus in the three-species treatment. 4. In the single-species treatments, seedlings colonized by the competitive dominants had higher shoot biomass and total leaf nitrogen, but also higher percentage ECM biomass. In the multi-species treatments, seedlings had either equivalent or somewhat lower shoot biomass and total leaf nitrogen than their respective single-species treatments. 5. Synthesis. Our results indicate that ECM competition does not appear to be characterized by strict networks or hierarchies. Instead, the outcome is dependent on the conditions of the local environment in which it occurs. There also does not seem to be a clear relationship between ECM competitive ability and plant performance, but competition does appear to negatively affect the ability of ECM fungi to provide benefits to their hosts.

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Section: Host Plant Performancesupporting

confidence: 92%

Competitive interactions among three ectomycorrhizal fungi and their relation to host plant performance

et al. 2007

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“…In these latter experiments, the factor manipulated is usually an aspect of the species being studied. Parlade & Alvarez (1993) examined competition among four EMF species, two host gener‐alists ( Laccaria bicolor and Pisolithus arhizus ) and two host specialists ( R. roseolus and Rhizopogon subareolatus ). They found that the outcome of competition varied depending on the species pairing, with L. bicolor outcompeting both Rhizopogon species, but P. arhizus being competitively superior to R. roseolus and competitively inferior to R. subareolatus .…”

Section: Patterns Of Emf Competitionmentioning

confidence: 99%

Ectomycorrhizal fungi and interspecific competition: species interactions, community structure, coexistence mechanisms, and future research directions

2010

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SummaryThe field of ectomycorrhizal fungal (EMF) ecology has largely developed outside the ecological mainstream, owing in large part to the challenges in studying the structure and dynamics of EMF communities. With advances in molecular identification and other research techniques, however, there has been growing interest among mycologists and ecologists in understanding how different ecological factors affect EMF community structure and diversity. While factors such as soil chemistry and host specificity have long been considered important, an increasing number of laboratory and field studies have documented that interspecific competition also has a major impact on EMF species interactions and may significantly influence EMF community structure. In this review, I examine the progress that has been made in understanding the nature of EMF competition. Currently, there are four conclusions that can be drawn: negative competitive effects are rarely reciprocal; competitive outcomes are environmentally context-dependent; field distributions often reflect competitive interactions; and timing of colonization influences competitive success. In addition, I highlight recent studies documenting links between competitive coexistence and EMF community structure, including checkerboard distributions, lottery models, storage effects, and colonization-

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“…This specificity is also borne out by the common association of section Villosuli spp. with Douglas fir in exotic plantations in Europe (Gross et al, 1980 ;Jansen & de Vries, 1989 ;Parlade! & A !…”

Section: mentioning

confidence: 99%

Comparative anatomy of ectomycorrhizas synthesized on Douglas fir by Rhizopogon spp. and the hypogeous relative Truncocolumella citrina

et al. 2000

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The morphology and anatomy of ectomycorrhizas of Rhizopogon parksii, Rhizopogon vinicolor and Rhizopogon subcaerulescens, and a hypogeous relative, Truncocolumella citrina, synthesized on Douglas fir in glasshouse conditions using spore slurries as inoculum, are described and compared. Mycorrhizas formed with R. parksii and R. vinicolor did not exhibit their characteristic subtuberculate morphology in these tests, but rather had a pinnate form. All species had diagnostic features of ectomycorrhizas : a well-developed Hartig net and a fungal mantle. In addition, several species exhibited crystal inclusions in the outer mantle, usually at the interface between the mantle and soil. Truncocolumella citrina had crystal-like inclusions within the mantle but external to fungal hyphae, a feature rarely described in ectomycorrhizas.

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Coinoculation of aseptically grown Douglas fir with pairs of ectomycorrhizal fungi

Cited by 38 publications

References 20 publications

Competitive interactions among three ectomycorrhizal fungi and their relation to host plant performance

Competitive interactions among three ectomycorrhizal fungi and their relation to host plant performance

Ectomycorrhizal fungi and interspecific competition: species interactions, community structure, coexistence mechanisms, and future research directions

Comparative anatomy of ectomycorrhizas synthesized on Douglas fir by Rhizopogon spp. and the hypogeous relative Truncocolumella citrina

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