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  • Ordon, Frank  (4)
  • Schikora, Adam  (4)
  • 1
    Online-Ressource
    Online-Ressource
    Priming Is a Suitable Strategy to Enhance Resistance Towards Leaf Rust in Barley
    Scientific Societies ; 2019
    In:  Phytobiomes Journal Vol. 3, No. 1 ( 2019-01), p. 46-51
    Details
    In: Phytobiomes Journal, Scientific Societies, Vol. 3, No. 1 ( 2019-01), p. 46-51
    Kurzfassung: Priming allows plants to respond faster and stronger to abiotic or biotic stresses. Leaf rust (Puccinia hordei) is an important pathogen of barley (Hordeum vulgare), for which resistance genes are known, but mostly overcome. Therefore, the aims of this study were (i) to establish a priming system in barley, based on bacterial N-acyl homoserine lactone (AHL), and (ii) to get information on the effect of priming on the reaction to leaf rust. Plants were inoculated with bacteria, i.e., Ensifer meliloti with repaired expR copy, producing the oxo-C14-homoserine lactone (AHL) and an E. meliloti strain carrying the attM lactonase gene from Agrobacterium tumefaciens, which cleaves the AHL and acts here as negative control. After three bacterial inoculations, plants were challenged with P. hordei strain I-80 at the three leaves stage. Twelve days after infection, scoring of the leaf area diseased and the infection type was conducted followed by the calculation of the relative susceptibility. First results indicate a significantly (P 〈 0.001) higher resistance level to P. hordei after inoculation with E. meliloti. Furthermore, significant (P 〈 0.001) differences were detected between the accessions tested for priming efficiency, which can be the basis to screen a larger set of barley accessions to detect quantitative trait loci or candidate genes involved in priming. [Formula: see text] Copyright © 2019 The Author(s). This is an open access article distributed under the CC BY 4.0 International license .
    Materialart: Online-Ressource
    ISSN: 2471-2906 , 2471-2906
    URL: Article
    DOI: 10.1094/PBIOMES-09-18-0041-R
    Sprache: Englisch
    Verlag: Scientific Societies
    Publikationsdatum: 2019
    ZDB Id: 2897163-2
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 2
    Online-Ressource
    Online-Ressource
    Genetic Differences in Barley Govern the Responsiveness to N -Acyl Homoserine Lactone
    Scientific Societies ; 2019
    In:  Phytobiomes Journal Vol. 3, No. 3 ( 2019-01), p. 191-202
    Details
    In: Phytobiomes Journal, Scientific Societies, Vol. 3, No. 3 ( 2019-01), p. 191-202
    Kurzfassung: Enhanced resistance in barley (Hordeum vulgare) against pathogens, such as the powdery mildew-causing fungus Blumeria graminis f. sp. hordei, is of high importance. The beneficial effects of bacterial quorum sensing molecules on resistance and plant growth have been shown in different plant species. Here, we present the effects of the N-3-oxotetradecanoyl-l-homoserine lactone (oxo-C14-HSL) on the resistance of different barley genotypes. Genetically diverse accessions of barley were identified and exposed to the beneficial, oxo-C14-HSL-producing bacterium Ensifer meliloti or the pure N-acyl homoserine lactone (AHL) molecule. Metabolic profiling along with expression analysis of selected genes and physiological assays revealed that the capacity to react varies among different barley genotypes. We demonstrate that upon pretreatment with AHL molecule, AHL-primable barley genotype expresses enhanced resistance against B. graminis f. sp. hordei. We further show that pretreatment with AHL correlates with stronger activation of barley MAP kinases and regulation of defense-related PR1 and PR17b genes after a subsequent treatment with chitin. Noticeable was the stronger accumulation of lignin. Our results suggest that appropriate genetic background is required for AHL-induced priming. At the same time, they bear potential to use these genetic features for new breeding and plant protection approaches.
    Materialart: Online-Ressource
    ISSN: 2471-2906 , 2471-2906
    URL: Article
    DOI: 10.1094/PBIOMES-03-19-0015-R
    Sprache: Englisch
    Verlag: Scientific Societies
    Publikationsdatum: 2019
    ZDB Id: 2897163-2
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 3
    Online-Ressource
    Online-Ressource
    Table_3.xlsx
    Frontiers Media SA ; 2023
    In:  Frontiers in Plant Science Vol. 13 ( 2023-1-12)
    Details
    In: Frontiers in Plant Science, Frontiers Media SA, Vol. 13 ( 2023-1-12)
    Kurzfassung: Leaf rust caused by Puccinia hordei is one of the major diseases of barley ( Hordeum vulgare L.) leading to yield losses up to 60%. Even though, resistance genes Rph 1 to Rph 28 are known, most of these are already overcome. In this context, priming may promote enhanced resistance to P. hordei . Several bacterial communities such as the soil bacterium Ensifer (syn. Sinorhizobium ) meliloti are reported to induce resistance by priming. During quorum sensing in populations of gram negative bacteria, they produce N -acyl homoserine-lactones (AHL), which induce resistance in plants in a species- and genotype-specific manner. Therefore, the present study aims to detect genotypic differences in the response of barley to AHL, followed by the identification of genomic regions involved in priming efficiency of barley. A diverse set of 198 spring barley accessions was treated with a repaired E. meliloti natural mutant strain expR + ch producing a substantial amount of AHL and a transformed E. meliloti strain carrying the lactonase gene attM from Agrobacterium tumefaciens . For P. hordei resistance the diseased leaf area and the infection type were scored 12 dpi (days post-inoculation), and the corresponding relative infection and priming efficiency were calculated. Results revealed significant effects (p & lt;0.001) of the bacterial treatment indicating a positive effect of priming on resistance to P. hordei . In a genome‐wide association study (GWAS), based on the observed phenotypic differences and 493,846 filtered SNPs derived from the Illumina 9k iSelect chip, genotyping by sequencing (GBS), and exome capture data, 11 quantitative trait loci (QTL) were identified with a hot spot on the short arm of the barley chromosome 6H, associated to improved resistance to P. hordei after priming with E. meliloti expR + ch . Genes in these QTL regions represent promising candidates for future research on the mechanisms of plant-microbe interactions.
    Materialart: Online-Ressource
    ISSN: 1664-462X
    URL: Article
    URL: Article
    URL: Article
    URL: Article
    URL: Article
    URL: Article
    URL: Article
    DOI: 10.3389/fpls.2022.1069087
    DOI: 10.3389/fpls.2022.1069087.s001
    DOI: 10.3389/fpls.2022.1069087.s002
    DOI: 10.3389/fpls.2022.1069087.s003
    DOI: 10.3389/fpls.2022.1069087.s004
    DOI: 10.3389/fpls.2022.1069087.s005
    DOI: 10.3389/fpls.2022.1069087.s006
    Sprache: Unbekannt
    Verlag: Frontiers Media SA
    Publikationsdatum: 2023
    ZDB Id: 2687947-5
    ZDB Id: 2613694-6
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 4
    Online-Ressource
    Online-Ressource
    Priming negatively affects feeding behaviour and aphid biomass of Rhopalosiphum padi on barley
    Springer Science and Business Media LLC ; 2021
    In:  Journal of Pest Science Vol. 94, No. 4 ( 2021-09), p. 1237-1247
    Details
    In: Journal of Pest Science, Springer Science and Business Media LLC, Vol. 94, No. 4 ( 2021-09), p. 1237-1247
    Kurzfassung: Plants have developed numerous strategies for responding to abiotic and biotic stresses. In particular, the microbiota surrounding plants may have a positive effect on plant stress responses. One is the reaction to rhizobacteria, which can lead to induced systemic resistance. Gram-negative soil bacteria that produce N -acyl homoserine lactones (AHL), for example, Ensifer meliloti , induce a primed state in plants that is part of the inducible resistance phenomenon. Observing Rhopalosiphum padi feeding behaviour on a priming sensitive barley genotype, treated with the AHL-producing E. meliloti strain expR  +  ch , using electrical penetration graph technique showed decreased ingestion of food. Aphids appear to overcome this effect within the eight-hour observation period, possibly explaining the absence of differences of reproduction. Reproduction was observed for a period of 14 days on primed and control-treated plants. Long-term observations over a period of 40 days after aphid infestation showed a lower aphid biomass in contrast to a control group, interpreted as delayed population growth, and an increase in the biomass of barley plants. Priming-related genotypic effects of the defence response to aphids were observed, with no beneficial effects on the plant genotype when its sensitivity to priming was low. Previously, an AHL-priming sensitive barley genotype showed enhanced resistance against fungi when primed with the expR  +  ch strain of E. meliloti . The present study reports the same effect against R. padi . These findings suggest that sensitivity to AHL-priming may represent a new approach for plant breeding, targeting multiple pests in parallel by induced plant resistance.
    Materialart: Online-Ressource
    ISSN: 1612-4758 , 1612-4766
    URL: Article
    DOI: 10.1007/s10340-021-01329-8
    Sprache: Englisch
    Verlag: Springer Science and Business Media LLC
    Publikationsdatum: 2021
    ZDB Id: 2141932-2
    SSG: 12
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
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