Protective Effect of an Ectomycorrhizal Fungus against the Root Pathogen Myceliumradicisatrovirens

Richard, Claude; Fortin, J. A.; Fortin, A.

doi:10.1139/x71-034

Cited by 27 publications

(13 citation statements)

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“…These symptoms are comparable to those observed by Richard et al (1971) for Picea mariana (Mill.) Seedlings inoculated with plugs of this fungus exhibited several symptoms, including chlorosis and necrosis of the needles.…”

Section: Fungal Culturessupporting

confidence: 89%

The in vitro effects of benomyl on disease tolerance, ectomycorrhiza formation, and growth of white pine (Pinus strobus) seedlings

Bastide¹,

Kendrick²

1990

Can. J. Bot.

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1990. The in vitro effects of benomyl on disease tolerance, ectomycorrhiza formation, and growth of white pine (Pinus strobus) seedlings. Can. J. Bot. 68: 444-448. The influence of benomyl (methyl 1-(butylcarbamoy1)-2-benzimidazolecarbamate) on disease tolerance, growth, and mycorrhization of aseptically grown white pine (Pinus strobus) seedlings was assayed using the growth pouch technique. Six-day-old seedlings were inoculated concurrently with plugs of a pathogenic fungus Mycelium radicis atrovirens and the ectomycorrhizal fungus Laccaria bicolor. Treatment with benomyl (100 ppm) reduced the pathogenic effects of M. radicis atrovirens, enhanced mycorrhization, and improved both shoot and overall seedling growth. The fungicidal activity of beno-my1 and improved mycorrhization by L. bicolor may both have influenced the pathogenicity of M. radicis atrovirens. A reduction in fungal competition within the seedling rhizosphere may improve the access of L. bicolor to potential colonization sites. DE LA BASTIDE, P. Y., et KENDRICK, B. 1990. The in vitro effects of benomyl on disease tolerance, ectomycorrhiza formation, and growth of white pine (Pinus strobus) seedlings. Can. J. Bot. 68 : 444-448. Les auteurs ont CtudiC l'influence du bCnomyl (mCthyl l(butylcarbamoy1)-2-benzimidazolecarbamate) sur la risistance ii la maladie, la croissance et la mycorhization de plants cultivks aseptiquement (Pinus strobus) en utilisant la technique de sachets de croissance. Des plantules 5gees de 6 jours ont Ct C inoculCes simultanCment avec des cylindres du champignon pathogene Mycelium radicis atrovirens et du champignon ectomycorhizien Laccaria bicolor. Le traitement au bCnomyl (100 ppm) rCduit les effets pathogeniques du M. radicis atrovirens, stimule le dCveloppement des mycorhizes et ameliore a la fois la croissance de la tige et de l'ensemble du semis. L'activiti fongicide du bCnomyl et 1'amClioration du dCveloppement mycorhizien par le L. bicolor pourraient ensemble avoir influence la pathogenicit6 du M. radicis atrovirens. Une rCduction de la competition fongique dans la rhizosphere de la plantule pourrait ameliorer l'acces du L. bicolor ii des sites potentiels de colonisation.[Traduit par la revue]

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Section: Fungal Culturessupporting

confidence: 89%

The in vitro effects of benomyl on disease tolerance, ectomycorrhiza formation, and growth of white pine (Pinus strobus) seedlings

Bastide¹,

Kendrick²

1990

Can. J. Bot.

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“…). Whereas the host benefits from the mycorrhiza‐mediated access to the plant growth‐promoting nutrients resulting from the saprotrophic activity of PAC, root colonization by PAC is constrained by the ECM mantle, which constitutes a physical and perhaps physiological barrier (Richard et al ., ). In fact, PAC biomass never exceeded 0.02 g per gram of root dry weight in dually inoculated roots, which is about 15 times less compared with the maximum PAC biomass in non‐mycorrhizal roots (Fig.…”

Section: Resultsmentioning

confidence: 97%

Mitigation of antagonistic effects on plant growth due to root co‐colonization by dark septate endophytes and ectomycorrhiza

Reininger

Sieber

2013

Environ Microbiol Rep

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Dark septate endophytes (DSE) are very common root colonizers of woody plant species. Ascomycetes of the Phialocephala fortinii s.l.-Acephala applanata species complex (PAC) are the main representatives of DSE fungi in forest ecosystems. PAC and mycorrhizal fungi share the same habitat, but interactions among PAC, mycorrhizal fungi and plants are poorly understood. We compared the effects of single and dual inoculation of Norway spruce seedlings with PAC and the ectomycorrhizal (ECM) fungus Hebeloma crustuliniforme on host growth, degree of mycorrhization and density of endophytic PAC biomass. Single colonization by H. crustuliniforme or PAC significantly reduced plant biomass. Dual colonization reduced or neutralized plant growth depression caused by single fungal colonization. The degree of mycorrhization was independent on PAC colonization, and mycorrhization significantly reduced endophytic PAC biomass. Plant biomass of dually colonized plants positively correlated with PAC biomass. These results demonstrate the ability of dual inoculation of PAC and H. crustuliniforme to neutralize plant growth depression caused by single fungal inoculation. Our explanations of enhanced plant growth in dually inoculated plants are the inhibition of PAC during root colonization by the ECM mantle and ECM-mediated access to plant growth-promoting nutrients resulting from the mineralization of the potting medium by PAC.

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“…However, colonization of established ectomycorrhizae (ECM) by PAC is significantly less frequent than that of nonmycorrhizal root tips (Grünig et al, 2008). Mycorrhizal fungi are known to protect plant seedlings against pathogens (Newsham et al, 1995;Azcó n-Aguilar & Barea, 1997;Whipps, 2004), and Richard et al (1971) showed that ECM formed by Suillus granulatus prevented DSE (probably PAC) from colonizing and adversely affecting Picea mariana seedlings. Similarly, PAC colonization of ECM of P. abies and Pseudotsuga menziesii was less frequent and less dense than that of nonmycorrhizal roots (V. Reininger, unpublished).…”

Section: Discussionmentioning

confidence: 99%

Do colonization by dark septate endophytes and elevated temperature affect pathogenicity of oomycetes?

Tellenbach

Sieber

2012

FEMS Microbiol Ecol

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Phialocephala subalpina is one of the most frequent dark septate root endophytes in tree roots but its function in forest ecosystems is largely unknown. A full-factorial infection experiment was performed, using six P. subalpina isolates, two pathogenic oomycetes (Phytophthora plurivora [syn. Phytophthora citricola s.l.] and Elongisporangium undulatum [syn. Pythium undulatum]) and two temperature regimes (17.9 and 21.6°C) to examine the ability of P. subalpina to protect Norway spruce seedlings against root pathogens. Seedling survival, disease intensity and seedling growth were affected by P. subalpina genotype, temperature and pathogen species. Some P. subalpina isolates effectively reduced mortality and disease intensity caused by the two pathogens. Elevated temperature adversely affected seedling growth but did not aggravate the effect of the pathogens. Elongisporangium undulatum but not P. plurivora significantly reduced plant growth. Colonization density of P. subalpina measured by quantitative PCR was not affected by temperature or the presence of the pathogens. In conclusion, P. subalpina confers an indirect benefit to its host and might therefore be tolerated in natural ecosystems, despite negative effects on plant health and plant growth.

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Protective Effect of an Ectomycorrhizal Fungus against the Root Pathogen Myceliumradicisatrovirens

Cited by 27 publications

References 0 publications

The in vitro effects of benomyl on disease tolerance, ectomycorrhiza formation, and growth of white pine (Pinus strobus) seedlings

The in vitro effects of benomyl on disease tolerance, ectomycorrhiza formation, and growth of white pine (Pinus strobus) seedlings

Mitigation of antagonistic effects on plant growth due to root co‐colonization by dark septate endophytes and ectomycorrhiza

Do colonization by dark septate endophytes and elevated temperature affect pathogenicity of oomycetes?

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