Stimulation of Germination of Spores of Glomus versiforme by Spore-Associated Bacteria

Mayo, Kathryn; Davis, Robert E.; Motta, Jerome J.

doi:10.2307/3793046

Cited by 72 publications

(35 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Therefore, the conditions for resource acquisition were better in that soil even though the data on the abundance of the indigenous microbiota (as assessed by the number of 16S copies per gram of soil and the population size of the native Pseudomonas , see Table 3) indicate a higher potential for competition with native populations. The high level of root colonization by AMF in this soil, which can be explained by its organic management (Brundrett, 1991; Jansa et al, 2002; Oehl et al, 2004), could have further facilitated the colonization by the strain Pf153 (Mayo et al, 1986; Meyer and Linderman, 1986; Barea et al, 1998). Studies on the influence of soil parameters on PGPR persistence are relatively scarce.…”

Section: Discussionmentioning

confidence: 97%

Tracing of Two Pseudomonas Strains in the Root and Rhizoplane of Maize, as Related to Their Plant Growth-Promoting Effect in Contrasting Soils

Mosimann

Oberhänsli

Ziegler³

et al. 2017

Front. Microbiol.

View full text Add to dashboard Cite

TaqMan-based quantitative PCR (qPCR) assays were developed to study the persistence of two well-characterized strains of plant growth-promoting rhizobacteria (PGPR), Pseudomonas fluorescens Pf153 and Pseudomonas sp. DSMZ 13134, in the root and rhizoplane of inoculated maize plants. This was performed in pot experiments with three contrasting field soils (Buus, Le Caron and DOK-M). Potential cross-reactivity of the qPCR assays was assessed with indigenous Pseudomonas and related bacterial species, which had been isolated from the rhizoplane of maize roots grown in the three soils and then characterized by Matrix-Assisted Laser Desorption Ionization (MALDI) Time-of-Flight (TOF) mass spectrometry (MS). Sensitivity of the qPCR expressed as detection limit of bacterial cells spiked into a rhizoplane matrix was 1.4 × 102 CFU and 1.3 × 104 CFU per gram root fresh weight for strain Pf153 and DSMZ 13134, respectively. Four weeks after planting and inoculation, both strains could readily be detected in root and rhizoplane, whereas only Pf153 could be detected after 8 weeks. The colonization rate of maize roots by strain Pf153 was significantly influenced by the soil type, with a higher colonization rate in the well fertile and organic soil of Buus. Inoculation with strain DSMZ 13134, which colonized roots and rhizoplane to the same degree, independently of the soil type, increased yield of maize, in terms of biomass accumulation, only in the acidic soil of Le Caron, whereas inoculation with strain Pf153 reduced yield in the soil Buus, despite of its high colonization rate and persistence. These results indicate that the colonization rate and persistence of inoculated Pseudomonas strains can be quantitatively assessed by the TaqMan-based qPCR technique, but that it cannot be taken for granted that inoculation with a well-colonizing and persistent Pseudomonas strain has a positive effect on yield of maize.

show abstract

Section: Discussionmentioning

confidence: 97%

Tracing of Two Pseudomonas Strains in the Root and Rhizoplane of Maize, as Related to Their Plant Growth-Promoting Effect in Contrasting Soils

Mosimann

Oberhänsli

Ziegler³

et al. 2017

Front. Microbiol.

View full text Add to dashboard Cite

show abstract

“…Germination was also enhanced following addition of kaolin or activated charcoal, indicating that the spores contained self-inhibitors, which were possibly inactivated by soil bacteria, or were immobilised by substances with a high ion exchange capacity. Similarly, Mayo et al [41] showed that surface-sterilised spores of G. versiforme germinated less frequently than non-surface sterilised spores. Isolation of bacteria from these spores showed that several genera, including Pseudomonas and Corynebacterium, enhanced spore germination.…”

Section: Effects Of Mycorrhizosphere Bacteria On Am Fungimentioning

confidence: 92%

Microbial interactions in the mycorrhizosphere and their significance for sustainable agriculture

Johansson

Paul

Finlay

2004

FEMS Microbiology Ecology

599

312

View full text Add to dashboard Cite

In sustainable, low-input cropping systems the natural roles of microorganisms in maintaining soil fertility and biocontrol of plant pathogens may be more important than in conventional agriculture where their significance has been marginalised by high inputs of agrochemicals. Better understanding of the interactions between arbuscular mycorrhizal fungi and other microorganisms is necessary for the development of sustainable management of soil fertility and crop production. Many studies of the influence of mycorrhizal colonisation on associated bacterial communities have been conducted, however, the mechanisms of interaction are still poorly understood. Novel approaches including PCR-based methods, stable isotope profiling, and molecular markers have begun to shed light on the activity, identity and spatiotemporal location of bacteria in the mycorrhizosphere. This paper reviews current knowledge concerning the interactions between arbuscular mycorrhizal fungi and other microorganisms, particularly bacteria, and discusses the implications these interactions may have in sustainable agriculture.

show abstract

“…As already mentioned, close contact between organisms is essential to characterize parasitism, but it does not define the ultimate relationship by itself. The fact that some AMF may even favor invasion of spores by some bacteria that increase spore germination (Mayo et al, 1986;Levy et al, 2003) is a very strong argument against suggesting parasitism based only on visual observations. These problems are not exclusive to AMF; bacterial parasitism is poorly understood in other groups of fungi.…”

Section: Parasitism Of Amf By Bacteriamentioning

confidence: 99%

Parasitism of arbuscular mycorrhizal fungi: reviewing the evidence

Purin¹,

Rillig²

2008

FEMS Microbiology Letters

View full text Add to dashboard Cite

In order to understand the functioning of mycorrhizal fungi in ecosystems it is necessary to consider the full suite of possible biotic interactions in the soil. While a number of such interactions have recently been shown to be crucially important, parasitism is a highly neglected feature in the ecology of arbuscular mycorrhizal fungi (AMF). A number of studies have classified some interactions between populations of bacteria and fungi with AMF as parasitism, generating discussion about its consequences at both 'parasite' and host population levels. This paper reviews these various publications, and based on a set of criteria that are necessary to demonstrate parasitism, it was concluded that parasitism has not been conclusively shown to exist in AMF, even though some data are highly suggestive of such a relationship. The difficulties in gathering data supportive of parasitism were discussed, and hypotheses for defense were offered. This paper concludes by presenting potential consequences of AMF parasitism at the population/community levels and by discussing applied aspects.

show abstract

Stimulation of Germination of Spores of Glomus versiforme by Spore-Associated Bacteria

Cited by 72 publications

References 0 publications

Tracing of Two Pseudomonas Strains in the Root and Rhizoplane of Maize, as Related to Their Plant Growth-Promoting Effect in Contrasting Soils

Tracing of Two Pseudomonas Strains in the Root and Rhizoplane of Maize, as Related to Their Plant Growth-Promoting Effect in Contrasting Soils

Microbial interactions in the mycorrhizosphere and their significance for sustainable agriculture

Parasitism of arbuscular mycorrhizal fungi: reviewing the evidence

Contact Info

Product

Resources

About