Induced Systemic Resistance and the Rhizosphere Microbiome

Bakker, Peter A. H. M.; Doornbos, Rogier F.; Zamioudis, Christos; Berendsen, Roeland L.; Pieterse, Corné M. J.

doi:10.5423/ppj.si.07.2012.0111

Cited by 112 publications

(65 citation statements)

References 93 publications

(112 reference statements)

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“…A biochemical analysis indicated a higher activity of the defense-related enzymes such as PAL, PO and PPO in treated plants as compared with negative control. These enzymes contribute towards the induction of systemic resistance, a well-known mechanism of disease suppression adopted by numerous rhizobacteria (Martinez-Viveros et al 2010;Bakker et al 2013;Muzammil et al 2014). The induction of defense-related enzymes activity by developed formulation further makes the results interesting, as recent investigations on the mechanisms of biological control by the bioformulation depicted that the consortia of strains formulated in sugarcane filter cake protects the sugarcane plants from red rot disease by stimulating the activities of defense enzymes PAL, PPO and PO in plants which could synthesize the phytoalexins (van Loon and Bakker 2005; Monnerat et al 2007).…”

Section: Discussionmentioning

confidence: 99%

Suppression of red rot disease by Bacillus sp. based biopesticide formulated in non-sterilized sugarcane filter cake

Hassan

Namood-e-Sahar

Shah³

et al. 2015

BioControl

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Red rot disease affects sugarcane production adversely throughout the world. Intensive cropping and uninterrupted use of chemicals results in evolution of new pathotypes which can infect the resistant cultivars. Bacillus sp. inhabiting plant rhizosphere can protect the plants from multiple pathogens. In the present study, two antagonistic strains Bacillus subtilis NH-100 and Bacillus sp. NH-217 were able to maintain their population at 9.0 log CFU g -1 in sugarcane filter cake until nine months. These strains were compatibile to the indigenous bacteria of sugarcane filter cake which maintained their population at 7.8-8.0 log CFU g -1 . The developed bioformulation induced the activity of various defense-related enzymes (0.6-6.9 change in absorbance min -1 g -1 of tissue), suppressed the red rot disease and enhanced crop yield under field conditions. This formulation could be used as potential biopesticide to control red rot disease of sugarcane.

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Section: Discussionmentioning

confidence: 99%

Suppression of red rot disease by Bacillus sp. based biopesticide formulated in non-sterilized sugarcane filter cake

Hassan

Namood-e-Sahar

Shah³

et al. 2015

BioControl

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“…The majority of plant-associated microbes resides in the thin soil layer that is influenced by plant roots called rhizosphere, a dynamic niche in the soil that is strongly affected by the release of root exudates (Barea et al, 2005; Lundberg et al, 2012). The microbial community associated with plant roots, the so-called rhizosphere microbiome, has an important role in plant health and survival (Bakker et al, 2013; Mendes et al, 2013). The effects of the rhizosphere microbiome on ISR have mainly been studied for plant–pathogen interactions (Mendes et al, 2011), although mechanistic studies on the effects of the microbiome on ISR against herbivores have been initiated (Badri et al, 2013).…”

Section: Moving From Effects Of Single Microbe Species To the Communimentioning

confidence: 99%

Two-way plant mediated interactions between root-associated microbes and insects: from ecology to mechanisms

et al. 2013

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Plants are members of complex communities and function as a link between above- and below-ground organisms. Associations between plants and soil-borne microbes commonly occur and have often been found beneficial for plant fitness. Root-associated microbes may trigger physiological changes in the host plant that influence interactions between plants and aboveground insects at several trophic levels. Aboveground, plants are under continuous attack by insect herbivores and mount multiple responses that also have systemic effects on belowground microbes. Until recently, both ecological and mechanistic studies have mostly focused on exploring these below- and above-ground interactions using simplified systems involving both single microbe and herbivore species, which is far from the naturally occurring interactions. Increasing the complexity of the systems studied is required to increase our understanding of microbe–plant–insect interactions and to gain more benefit from the use of non-pathogenic microbes in agriculture. In this review, we explore how colonization by either single non-pathogenic microbe species or a community of such microbes belowground affects plant growth and defense and how this affects the interactions of plants with aboveground insects at different trophic levels. Moreover, we review how plant responses to foliar herbivory by insects belonging to different feeding guilds affect interactions of plants with non-pathogenic soil-borne microbes. The role of phytohormones in coordinating plant growth, plant defenses against foliar herbivores while simultaneously establishing associations with non-pathogenic soil microbes is discussed.

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“…In return, several of the associated microbes will protect plants against pathogens by producing antibiotics and stimulating plant immunity (Bakker et al . ).…”

Section: Introductionmentioning

confidence: 97%

Systemic enrichment of antifungal traits in the rhizosphere microbiome after pathogen attack

2016

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Summary Plant‐associated microbial communities are crucial for plant growth and play an important role in disease suppression. Community composition and function change upon pathogen attack, yet to date, we do not know whether these changes are a side effect of the infection or actively driven by the plant. Here, we used a split‐root approach to test whether barley plants recruit bacteria carrying antifungal traits upon infestation with Fusarium graminearum. Split‐root systems allow disentangling local infection effects, such as root damage, from systemic, plant‐driven effects on microbiome functionality. We assessed the recruitment of fluorescent pseudomonads, a taxon correlated with disease suppression, and of two well‐described antifungal genes (phlD coding for 2,4‐DAPG and hcnAB coding for HCN). We show an enrichment of fluorescent pseudomonads, phlD and hcnAB, upon pathogen infection. This effect was only measurable in the uninfected root compartment. We link these effects to an increased chemotaxis of pseudomonads towards exudates of infected plants. Synthesis. We conclude that barley plants selectively recruited bacteria carrying antifungal traits upon pathogen attack and that the pathogen application locally interfered with this process. By disentangling these two effects, we set the base for enhancing strategies unravelling how pathogens and plant hosts jointly shape microbiome functionality.

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Induced Systemic Resistance and the Rhizosphere Microbiome

Cited by 112 publications

References 93 publications

Suppression of red rot disease by Bacillus sp. based biopesticide formulated in non-sterilized sugarcane filter cake

Suppression of red rot disease by Bacillus sp. based biopesticide formulated in non-sterilized sugarcane filter cake

Two-way plant mediated interactions between root-associated microbes and insects: from ecology to mechanisms

Systemic enrichment of antifungal traits in the rhizosphere microbiome after pathogen attack

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