Mycorrhizal fungi increase biocontrol potential of Pseudomonas fluorescens

Siasou, Eleni; Standing, Dominic; Killham, Ken; Johnson, David

doi:10.1016/j.soilbio.2009.02.028

Cited by 25 publications

(11 citation statements)

References 27 publications

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“…Studies using Pseudomonas aeruginosa have described similar effects on other crops such as rice and tobacco (Geert et al 1999;Saikia et al 2006). Pseudomonas strains have also been reported to produce antibiotic compounds and the well-known antifungal compound 2,4-diacetylphloroglucinol (DAPG), but they were reported to not affect AMF performance in combination Hameeda et al 2007;Siasou et al 2009). Similarly, Pseudomonas aeruginosa UPMP3 did not adversely affect root colonisation of the oil palm seedlings by Glomus intraradices UT126 and Glomus clarum BR152B.…”

Section: Discussionmentioning

confidence: 96%

“…Sapak et al (2008) isolated two potential EB, Pseudomonas aeruginosa UPMP3 and Burkholderia cepacia UPMB3, which effectively suppressed Ganoderma boninense in both in vitro (Sundram et al 2011) and in vivo (Sapak et al 2008) trials. However, since certain Pseudomonas strains can produce metabolites with more antimicrobial activity (Siasou et al 2009), it was necessary to assess compatibility between these microbes and AMF before an in vivo application. In a previous in vitro study, it was found that the same EB strains enhance spore germination and hyphal growth of Glomus intraradices UT126 and Glomus clarum BR152B (Sundram et al 2011).…”

Section: Introductionmentioning

confidence: 99%

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Application of arbuscular mycorrhizal fungi with Pseudomonas aeruginosa UPMP3 reduces the development of Ganoderma basal stem rot disease in oil palm seedlings

et al. 2014

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The effect of arbuscular mycorrhizal fungi (AMF) in combination with endophytic bacteria (EB) in reducing development of basal stem rot (BSR) disease in oil palm (Elaeis guineensis) was investigated. BSR caused by Ganoderma boninense leads to devastating economic loss and the oil palm industry is struggling to control the disease. The application of two AMF with two EB as biocontrol agents was assessed in the nursery and subsequently, repeated in the field using bait seedlings. Seedlings pre-inoculated with a combination of Glomus intraradices UT126, Glomus clarum BR152B and Pseudomonas aeruginosa UPMP3 significantly reduced disease development measured as the area under disease progression curve (AUDPC) and the epidemic rate (R L) of disease in the nursery. A 20-month field trial using similar treatments evaluated disease development in bait seedlings based on the rotting area/advancement assessed in cross-sections of the seedling base. Data show that application of Glomus intraradices UT126 singly reduced disease development of BSR, but that combination of the two AMF with P. aeruginosa UPMP3 significantly improved biocontrol efficacy in both nursery and fields reducing BSR disease to 57 and 80%, respectively. The successful use of bait seedlings in the natural environment to study BSR development represents a promising alternative to nursery trial testing in the field with shorter temporal assessment.

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Section: Discussionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Application of arbuscular mycorrhizal fungi with Pseudomonas aeruginosa UPMP3 reduces the development of Ganoderma basal stem rot disease in oil palm seedlings

et al. 2014

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“…While plant performance consequences of AMF are often examined in the presence of a microbial wash (Klironomos 2003, Scheublin et al 2007, the source of the wash usually does not vary within the experiment as was done here. A few studies have purposely varied combinations of AMF and soil microbes but not the full complement of non-AMF microbes found in the soil (Andrade et al 1998, Dabire et al 2007, Siasou et al 2009).…”

Section: Discussionmentioning

confidence: 99%

Biotic contexts alter metal sequestration and AMF effects on plant growth in soils polluted with heavy metals

Glassman

Casper

2012

Ecology

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Investigating how arbuscular mycorrhizal fungi (AMF)–plant interactions vary with edaphic conditions provides an opportunity to test the context‐dependency of interspecific interactions. The relationship between AMF and their host plants in the context of other soil microbes was studied along a gradient of heavy metal contamination originating at the site of zinc smelters that operated for a century. The site is currently under restoration. Native C3 grasses have reestablished, and C4 grasses native to the region but not the site were introduced. Interactions involving the native mycorrhizal fungi, non‐mycorrhizal soil microbes, soil, one C3 grass (Deschampsia flexuosa), and one C4 grass (Sorghastrum nutans) were investigated using soils from the two extremes of the contamination gradient in a full factorial greenhouse experiment. After 12 weeks, plant biomass and root colonization by AMF and non‐mycorrhizal microbes were measured. Plants from both species grew much larger in soil from low‐contaminated (LC) origin than high‐contaminated (HC) origin. For S. nutans, the addition of a non‐AMF soil microbial wash of either origin increased the efficacy of AMF from LC soils but decreased the efficacy of AMF from HC soils in promoting plant growth. Furthermore, there was high mortality of S. nutans in HC soil, where plants with AMF from HC died sooner. For D. flexuosa, plant biomass did not vary with AMF source or the microbial wash treatment or their interaction. While AMF origin did not affect root colonization of D. flexuosa by AMF, the presence and origin of AMF did affect the number of non‐mycorrhizal (NMF) morphotypes and NMF root colonization. Adding non‐AMF soil biota reduced Zn concentrations in shoots of D. flexuosa. Thus the non‐AMF biotic context affected heavy metal sequestration and associated NMF in D. flexuosa, and it interacted with AMF to affect plant biomass in S. nutans. Our results should be useful for improving our basic ecological understanding of the context‐dependency of plant–soil interactions and are potentially important in restoration of heavy‐metal‐contaminated sites.

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“…Nevertheless, such communities seem to exhibit a greater potential for protection (Tchabi et al, 2010). The great diversity of the microbial population present in the mycorrhizosphere (Toljander et al, 2007) also plays an important role in protecting against biotic (Neeraj and Singh, 2011;Siasou et al, 2009) and abiotic stresses (Nogueira and Cardoso, 2002). Despite the complexity of all these interactions, it is recognized that a well-established AM is crucial for an adequate degree of protection (Khaosaad et al, 2007;Garg and Chandel, 2010).…”

Section: Introductionmentioning

confidence: 99%

Managing arbuscular mycorrhizal fungi for bioprotection: Mn toxicity

Brito

Carvalho

Alho

et al. 2014

Soil Biology and Biochemistry

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a b s t r a c tWe investigated whether an intact extraradical mycelium (ERM) is more effective than other forms of propagule from indigenous arbuscular mycorrhizal fungi (AMF) in providing protection against stress to a host plant. The response of wheat (Triticum aestivum L.) to Mn toxicity was studied in a two-phase greenhouse experiment. In Phase 1, four Mn tolerant species from the natural vegetation, ranging from strongly mycotrophic to non-or weakly mycotrophic, were grown to develop different amounts of ERM. Wheat was then planted (Phase 2) with the ERM fragmented by sieving (Disturbed Treatment) or kept intact with no prior soil disturbance (Undisturbed Treatment). The growth of wheat was doubled by earlier and faster mycorrhizal colonization (AC) in the presence of an intact ERM at planting. There was a positive correlation between plant growth and the reduction of Mn and enhancement of P and S uptake into shoots. However, the growth of plants in undisturbed soil was significantly affected by the ERM developer species, which was not explained by differences in AC. Colonization starting from an intact ERM greatly enhanced the potential of AMF for protection against Mn toxicity. However, the degree of protection depended on the plant previously grown to develop the ERM, suggesting that there may be functional diversity within the ERM developed by mycotrophic plants of the natural vegetation.

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Mycorrhizal fungi increase biocontrol potential of Pseudomonas fluorescens

Cited by 25 publications

References 27 publications

Application of arbuscular mycorrhizal fungi with Pseudomonas aeruginosa UPMP3 reduces the development of Ganoderma basal stem rot disease in oil palm seedlings

Application of arbuscular mycorrhizal fungi with Pseudomonas aeruginosa UPMP3 reduces the development of Ganoderma basal stem rot disease in oil palm seedlings

Biotic contexts alter metal sequestration and AMF effects on plant growth in soils polluted with heavy metals

Managing arbuscular mycorrhizal fungi for bioprotection: Mn toxicity

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