Iron in Plant–Pathogen Interactions

Expert, Dominique; Franza, Thierry; Dellagi, Alia

doi:10.1007/978-94-007-5267-2_2

Cited by 25 publications

(20 citation statements)

References 111 publications

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“…cubense 18. Thus, the plant Fe status could influence host–pathogen relationships in different ways by affecting the pathogen’s virulence as well as the host’s defense1922. In the present study, we observed that the conidial germination rate and fungal mycelium growth were greatly reduced by treatment with a high -Fe and -B nutrition solution (Fig.…”

Section: Discussionsupporting

confidence: 51%

“…Following FOC infection, a strong reduction in the Fe content was observed in the HP treatment, and the B content remained at a relatively high level. Fe plays a crucial role in redox systems in cells and in various enzymes, and B is crucial for cell wall and membrane integrity19. Fusarium infection could disturb the water balance of infected plant, due to damage of cell membrane20.…”

Section: Discussionmentioning

confidence: 99%

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Effects of iron and boron combinations on the suppression of Fusarium wilt in banana

Dong

Wang

Ling

et al. 2016

Sci Rep

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The effects of mineral nutrient on banana wilt disease, which are the result of a competitive relationship between host plants and pathogens, can affect the interactions of plants with microorganisms. To investigate the mineral nutrient effect, hydroponic experiments were conducted in glasshouse containing combinations of low, medium, and high iron (Fe) and boron (B) concentrations, followed by pathogen inoculation. High Fe and B treatment significantly reduced the disease index and facilitated plants growth. With increasing Fe and B concentrations, more Fe and B accumulated in plants. High Fe and B treatment dramatically reduced the Fusarium oxysporum conidial germination rate and fungal growth compared with the other two treatments, contributing to decreased numbers of the pathogen on infected plants. Furthermore, High Fe and B treatment decreased the fusaric acid production of F. oxysporum in vitro and also increased the mannitol content of the plants, which in turn decreased the phytotoxin production of infected plants and finally reduced the disease index due to the virulence factor of phytotoxin. Taken together, these results indicate that Fe and B play a multifunctional role in reducing the severity of diseases by affecting the growth of F. oxysporum and the responses between plants and pathogens.

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Section: Discussionsupporting

confidence: 51%

Section: Discussionmentioning

confidence: 99%

Effects of iron and boron combinations on the suppression of Fusarium wilt in banana

Dong

Wang

Ling

et al. 2016

Sci Rep

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“…However, it was shown that rice xylem sap contains both Fe 2+ and Fe 3+ at concentrations sufficient for bacterial growth (150). In contrast, mesophyll tissue might be iron limiting (43). Therefore, the Feo system may allow the tissue-specific adaptation of Xoo to rice xylem, but its role in host specificity is still unknown and needs to be explored.…”

Section: Iron Uptake and Niche Adaptationmentioning

confidence: 97%

Using Ecology, Physiology, and Genomics to Understand Host Specificity inXanthomonas

Jacques

Arlat

Boulanger

et al. 2016

Annu. Rev. Phytopathol.

163

139

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How pathogens coevolve with and adapt to their hosts are critical to understanding how host jumps and/or acquisition of novel traits can lead to new disease emergences. The Xanthomonas genus includes Gram-negative plant-pathogenic bacteria that collectively infect a broad range of crops and wild plant species. However, individual Xanthomonas strains usually cause disease on only a few plant species and are highly adapted to their hosts, making them pertinent models to study host specificity. This review summarizes our current understanding of the molecular basis of host specificity in the Xanthomonas genus, with a particular focus on the ecology, physiology, and pathogenicity of the bacterium. Despite our limited understanding of the basis of host specificity, type III effectors, microbe-associated molecular patterns, lipopolysaccharides, transcriptional regulators, and chemotactic sensors emerge as key determinants for shaping host specificity.

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“…For instance, some fungal pathogens require iron for their pathogenicity [39]. On the other hand, siderophores produced by beneficial rhizobacteria are responsible for scavenging ferric iron from the environment and may directly inhibit the pathogen growth by iron competition [40].…”

Section: Introductionmentioning

confidence: 99%

Selection of Streptomyces against soil borne fungal pathogens by a standardized dual culture assay and evaluation of their effects on seed germination and plant growth

et al. 2016

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BackgroundIn the search for new natural resources for crop protection, streptomycetes are gaining interest in agriculture as plant growth promoting bacteria and/or biological control agents. Because of their peculiar life cycle, in which the production of secondary metabolites is synchronized with the development of aerial hyphae and sporulation, the commonly used methods to screen for bacterial antagonists need to be adapted.ResultsThe dual culture assay was standardized in terms of inoculation timing of Streptomyces antagonist and pathogen, and growth rate of different fungal pathogens. In case of fast-growing fungi, inoculation of the antagonist 2 or 3 days prior to the pathogen resulted in significantly stronger inhibition of mycelium growth. One hundred and thirty Streptomyces strains were evaluated against six destructive soil borne pathogens. The activity of strains varied from broad-spectrum to highly specific inhibition of individual pathogens. All strains inhibited at least one tested pathogen. Three strains, which combined the largest broad-spectrum with the highest inhibition activity, were selected for further characterization with four vegetable species. All of them were able to colonize seed surface of all tested vegetable crops. They mostly improved radicle and hypocotyl growth in vitro, although no statistically significant enhancement of biomass weight was observed in vivo. Occasionally, transient negative effects on germination and plant growth were observed.ConclusionsThe adapted dual culture assay allowed us to compare the inhibition of individual Streptomyces strains against six fungal soil borne pathogens. The best selected strains were able to colonize the four vegetable crops and have a potential to be developed into biocontrol products. Although they occasionally negatively influenced plant growth, these effects did not persist during the further development. Additional in vivo studies are needed to confirm their potential as biological control or plant growth promoting agents.Electronic supplementary materialThe online version of this article (doi:10.1186/s12866-016-0886-1) contains supplementary material, which is available to authorized users.

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Iron in Plant–Pathogen Interactions

Cited by 25 publications

References 111 publications

Effects of iron and boron combinations on the suppression of Fusarium wilt in banana

Effects of iron and boron combinations on the suppression of Fusarium wilt in banana

Using Ecology, Physiology, and Genomics to Understand Host Specificity inXanthomonas

Selection of Streptomyces against soil borne fungal pathogens by a standardized dual culture assay and evaluation of their effects on seed germination and plant growth

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