Seed Treatment with 2,4-Diacetylphloroglucinol-Producing Pseudomonads Improves Crop Health in Low-pH Soils by Altering Patterns of Nutrient Uptake

Raudales, Rosa E.; Stone, E; Gardener, Brian B. McSpadden

doi:10.1094/phyto-99-5-0506

Cited by 26 publications

(13 citation statements)

References 32 publications

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“…fluorescens strain. This was the first evidence that DAPG producers, in addition to their role in pathogen control, can also act to ameliorate abiotic stress factors (Raudales et al ., ). The presence of pollutants in soil has promoted the search for efficient bioremediation methods as an alternative for excavation and incineration.…”

Section: Impact Of the Rhizosphere Microbiome On Plant Growth Healthmentioning

confidence: 97%

The rhizosphere microbiome: significance of plant beneficial, plant pathogenic, and human pathogenic microorganisms

2013

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Microbial communities play a pivotal role in the functioning of plants by influencing their physiology and development. While many members of the rhizosphere microbiome are beneficial to plant growth, also plant pathogenic microorganisms colonize the rhizosphere striving to break through the protective microbial shield and to overcome the innate plant defense mechanisms in order to cause disease. A third group of microorganisms that can be found in the rhizosphere are the true and opportunistic human pathogenic bacteria, which can be carried on or in plant tissue and may cause disease when introduced into debilitated humans. Although the importance of the rhizosphere microbiome for plant growth has been widely recognized, for the vast majority of rhizosphere microorganisms no knowledge exists. To enhance plant growth and health, it is essential to know which microorganism is present in the rhizosphere microbiome and what they are doing. Here, we review the main functions of rhizosphere microorganisms and how they impact on health and disease. We discuss the mechanisms involved in the multitrophic interactions and chemical dialogues that occur in the rhizosphere. Finally, we highlight several strategies to redirect or reshape the rhizosphere microbiome in favor of microorganisms that are beneficial to plant growth and health.

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Section: Impact Of the Rhizosphere Microbiome On Plant Growth Healthmentioning

confidence: 97%

The rhizosphere microbiome: significance of plant beneficial, plant pathogenic, and human pathogenic microorganisms

2013

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“…Recent studies have shown that different plant growth-promoting rhizobacteria (PGPR) can elicit so-called "induced systemic tolerance" to abiotic stresses, such as salt and drought (76) and acid soil stress (59). What role might volatiles play in these phenomena related to plant health?…”

Section: Production and Effects Of Bacterial Volatilesmentioning

confidence: 99%

The Multifactorial Basis for Plant Health Promotion by Plant-Associated Bacteria

Kim

Leveau

Gardener

et al. 2011

Appl Environ Microbiol

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225

138

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7On plants, microbial populations interact with each other and their host through the actions of secreted metabolites. However, the combined action of diverse organisms and their different metabolites on plant health has yet to be fully appreciated. Here, the multifactorial nature of these interactions, at the organismal and molecular level, leading to the biological control of plant diseases is reviewed. To do so, we describe in detail the ecological significance of three different classes of secondary metabolites and discuss how they might contribute to biological control. Specifically, the roles of auxin, acetoin, and phenazines are considered, because they represent very different but important types of secondary metabolites. We also describe how studies of the global regulation of bacterial secondary metabolism have led to the discovery of new genes and phenotypes related to plant health promotion. In conclusion, we describe three avenues for future research that will help to integrate these complex and diverse observations into a more coherent synthesis of bacterially mediated biocontrol of plant diseases.Diverse plant-associated bacteria can positively impact plant health and physiology in a variety of ways (19). Three wellstudied mechanisms of biological disease control and plant health promotion conferred by plant-associated bacteria have recently been reviewed (38). However, the focus on identifying and characterizing individual mechanisms has obscured the complex, multifactorial nature of biological control. So, while many different biocontrol bacteria have been identified and much has been learned about different types of plant-bacterium interactions for some of these populations, we are just beginning to appreciate the number and complexity of interactions actually taking place in situ. Indeed, many different bacteria and many different bacterial metabolites have been identified as important contributors to the biological control of plant diseases. However, we still lack a clear understanding of how the populations and activities of the diverse populations of microorganisms that colonize every plant are connected and integrated in natural and agricultural environments.Here, we review recent work that indicates the multifactorial nature of biocontrol (Fig. 1). Specifically, we review a number of the studies indicating that biocontrol arises from the combined actions of multiple bacterial populations, each expressing several different classes of bioactive metabolites under the control of multiple genes and regulons. And we highlight recent work in the authors' laboratories that begins to identify the diverse factors contributing to changes in plant growth and health status. We conclude by providing a road map for future research that will lead to a greater understanding of the complex, dynamic, and multifactorial nature of biological control phenotypes expressed by plant-associated bacteria.

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“…Besides induction of resistance against pathogens, ROS play an important role in abiotic stresses such as drought and high salt (Mittler 2002). Recently accumulated studies presented that PGPR also augmented plant resistance to abiotic stresses referred to as "induced systemic tolerance" (Yang et al 2009b;Raudales et al 2009). More interestingly, among bacterial determinants, two recent studies demonstrated that bacterial volatiles conferred resistance to salt and drought (Zhang et al 2009b;Cho et al 2008).…”

Section: Enzymatic Activities Of Antioxidant Proteinsmentioning

confidence: 99%

Proteome analysis of Arabidopsis seedlings exposed to bacterial volatiles

Kwon

Ryu

Lee

et al. 2010

Planta

134

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Plant root-associated bacteria (rhizobacteria) elicit plant basal immunity referred to as induced systemic resistance (ISR) against multiple pathogens. Among multi-bacterial determinants involving such ISR, the induction of ISR and promotion of growth by bacterial volatile compounds was previously reported. To exploit global de novo expression of plant proteins by bacterial volatiles, proteomic analysis was performed after exposure of Arabidopsis plants to the rhizobacterium Bacillus subtilis GB03. Ethylene biosynthesis enzymes were significantly up-regulated. Analysis by quantitative reverse transcriptase polymerase chain reaction confirmed that ethylene biosynthesis-related genes SAM-2, ACS4, ACS12, and ACO2 as well as ethylene response genes, ERF1, GST2, and CHIB were up-regulated by the exposure to bacterial volatiles. More interestingly, the emission of bacterial volatiles significantly up-regulated both key defense mechanisms mediated by jasmonic acid and salicylic acid signaling pathways. In addition, high accumulation of antioxidant proteins also provided evidence of decreased sensitivity to reactive oxygen species during the elicitation of ISR by bacterial volatiles. The present results suggest that the proteomic analysis of plant defense responses in bacterial volatile-mediated ISR can reveal the mechanisms of plant basal defenses orchestrated by endogenous ethylene production pathways and the generation of reactive oxygen species.

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Seed Treatment with 2,4-Diacetylphloroglucinol-Producing Pseudomonads Improves Crop Health in Low-pH Soils by Altering Patterns of Nutrient Uptake

Abstract: Seed treatment with a 2,4-diacetylphloroglucinol (DAPG)-producing Pseudomonas strain ameliorated abiotic stress disorder in corn caused by growth in a low-pH soil. In two consecutive growing seasons, Wood1R-treated seed gave rise to plants that grew taller (P Show more

Cited by 26 publications

References 32 publications

The rhizosphere microbiome: significance of plant beneficial, plant pathogenic, and human pathogenic microorganisms

The rhizosphere microbiome: significance of plant beneficial, plant pathogenic, and human pathogenic microorganisms

The Multifactorial Basis for Plant Health Promotion by Plant-Associated Bacteria

Proteome analysis of Arabidopsis seedlings exposed to bacterial volatiles

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