Ectomycorrhiza formation and willow growth promotion as affected by associated bacteria: role of microbial metabolites and use of C sources

Hrynkiewicz, Katarzyna; Ciesielska, A.; Haug, Ingeborg; Baum, Christel

doi:10.1007/s00374-009-0419-2

Cited by 20 publications

(19 citation statements)

References 72 publications

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“…This suggests that the frequency of mycorrhizal colonisation might not always control its role for plant growth, but also physiological traits of the fungi can be responsible. This was supported by an intra-specific comparison of strains from another EM taxon (Paxillus involutus) by Hrynkiewicz et al (2010). The Laccaria sp.…”

Section: Discussionmentioning

confidence: 99%

The significance of rotation periods for mycorrhiza formation in Short Rotation Coppice

Hrynkiewicz

Baum

Leinweber

et al. 2010

Forest Ecology and Management

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Section: Discussionmentioning

confidence: 99%

The significance of rotation periods for mycorrhiza formation in Short Rotation Coppice

Hrynkiewicz

Baum

Leinweber

et al. 2010

Forest Ecology and Management

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“…Willow trees have several key advantages for phytoremediation when compared with other plants: they are genetically very diverse (400 species and over 200 hybrids, Newsholme, 2003), some species can be harvested frequently by coppicing, they are pioneer plants that have invasive growth strategies and very effective nutrient uptake systems, they grow fast and have high evapotranspiration rates and high productivity (Pulford and Watson, 2003). Although several studies have assessed the microbial communities associated with willows growing in contaminated soils (Leigh et al, 2006;de Carcer et al, 2007a,b;Kuffner et al, 2008;Hrynkiewicz et al, 2009;Zimmer et al, 2009;Weyens et al, 2013;Bell et al, 2014), the details of willow interactions with microbes are still not well understood.…”

Section: Introductionmentioning

confidence: 99%

Microbial expression profiles in the rhizosphere of willows depend on soil contamination

et al. 2013

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The goal of phytoremediation is to use plants to immobilize, extract or degrade organic and inorganic pollutants. In the case of organic contaminants, plants essentially act indirectly through the stimulation of rhizosphere microorganisms. A detailed understanding of the effect plants have on the activities of rhizosphere microorganisms could help optimize phytoremediation systems and enhance their use. In this study, willows were planted in contaminated and non-contaminated soils in a greenhouse, and the active microbial communities and the expression of functional genes in the rhizosphere and bulk soil were compared. Ion Torrent sequencing of 16S rRNA and Illumina sequencing of mRNA were performed. Genes related to carbon and amino-acid uptake and utilization were upregulated in the willow rhizosphere, providing indirect evidence of the compositional content of the root exudates. Related to this increased nutrient input, several microbial taxa showed a significant increase in activity in the rhizosphere. The extent of the rhizosphere stimulation varied markedly with soil contamination levels. The combined selective pressure of contaminants and rhizosphere resulted in higher expression of genes related to competition (antibiotic resistance and biofilm formation) in the contaminated rhizosphere. Genes related to hydrocarbon degradation were generally more expressed in contaminated soils, but the exact complement of genes induced was different for bulk and rhizosphere soils. Together, these results provide an unprecedented view of microbial gene expression in the plant rhizosphere during phytoremediation.

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“…Since most plant species are frequently also associated with symbiotic mycorrhizal fungi, the signaling system can become very complex and warrants further investigation. The association between PGPRs and mycorrhizae has only recently attracted attention, where the concept of the 'Helper Bacteria' goes beyond assistance with the recognition system between fungus and its host plant, to establish the symbiosis, to a plant growth enhancement in a tripartite association (Hrynkiewicz et al 2010 ).…”

Section: Anti-fungal Properties Of the Rhizospherementioning

confidence: 99%

Introduction: Soils and Their Promotion of Plant Growth

Dighton

2014

Interactions in Soil: Promoting Plant Growth

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Soil is a complex milieu of physical and biological entities that regulates the availability of nutrients for plant growth. The interactions between the elements of the soil biota and the plants during this process are complex and often rely on feedbacks between the plants and the great diversity of soil organisms that function to regulate processes to support plant growth. The rhizosphere and its mycorrhizal component are important parts of the connection between the plant and soil through its roots. This zone is a 'hot-spot' of microbial activity and trophic interactions with other soil organisms. It is here that growth of the plant root is infl uenced by nutrient availability, induction of root growth stimulating auxins, the interaction with plant pathogens and herbivores. Ecosystem engineers in the form of earthworms and other burrowing fauna are important in altering both the physical structure of soil and rates of decomposition of organic residues. A little researched component of soil is viruses. Their interaction with microbial and faunal communities is introduced here. Many of the soil processes infl uencing plant growth and the diversity of soil organisms is infl uenced by human activities ranging from agricultural and forestry practices through urbanization to the infl uence of pollution from industrial processes. To help us with the understanding of the interactions between biodiversity and function, new molecular tools involving metagenomics and transcriptomics are evolving, and are discussed here as an emerging suite of tools that can be applied to soil ecology. The chapter introduces the detail to come in subsequent chapters of this book.

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Ectomycorrhiza formation and willow growth promotion as affected by associated bacteria: role of microbial metabolites and use of C sources

Cited by 20 publications

References 72 publications

The significance of rotation periods for mycorrhiza formation in Short Rotation Coppice

The significance of rotation periods for mycorrhiza formation in Short Rotation Coppice

Microbial expression profiles in the rhizosphere of willows depend on soil contamination

Introduction: Soils and Their Promotion of Plant Growth

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