A biological agent modulates the physiology of barley infected with Drechslera teres

Backes, Aurélie; Vaillant‐Gaveau, Nathalie; Esmaeel, Qassim; Barka, Essaïd Ait; Jacquard, Cédric

doi:10.1038/s41598-021-87853-0

Cited by 9 publications

(5 citation statements)

References 86 publications

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“…They were watered three times a week with either LN or HN solutions. Plants were grown in a growth chamber (Aralab) at 23 • C under white fluorescent light (130 µmol m −2 s −1 ), with a 14-and 10-h photoperiod and 80% relative humidity as previously described by Backes et al (2021b). A detached leave assay was carried out to evaluate the susceptibility of the three genotypes to the pathogen Pyrenophora teres.…”

Section: Inoculum Preparation and Pathogen Infectionmentioning

confidence: 99%

Genotypic Variation of Nitrogen Use Efficiency and Amino Acid Metabolism in Barley

et al. 2022

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Owing to the large genetic diversity of barley and its resilience under harsh environments, this crop is of great value for agroecological transition and the need for reduction of nitrogen (N) fertilizers inputs. In the present work, we investigated the diversity of a North African barley genotype collection in terms of growth under limiting N (LN) or ample N (HN) supply and in terms of physiological traits including amino acid content in young seedlings. We identified a Moroccan variety, Laanaceur, accumulating five times more lysine in its leaves than the others under both N nutritional regimes. Physiological characterization of the barley collection showed the genetic diversity of barley adaptation strategies to LN and highlighted a genotype x environment interaction. In all genotypes, N limitation resulted in global biomass reduction, an increase in C concentration, and a higher resource allocation to the roots, indicating that this organ undergoes important adaptive metabolic activity. The most important diversity concerned leaf nitrogen use efficiency (LNUE), root nitrogen use efficiency (RNUE), root nitrogen uptake efficiency (RNUpE), and leaf nitrogen uptake efficiency (LNUpE). Using LNUE as a target trait reflecting barley capacity to deal with N limitation, this trait was positively correlated with plant nitrogen uptake efficiency (PNUpE) and RNUpE. Based on the LNUE trait, we determined three classes showing high, moderate, or low tolerance to N limitation. The transcriptomic approach showed that signaling, ionic transport, immunity, and stress response were the major functions affected by N supply. A candidate gene encoding the HvNRT2.10 transporter was commonly up-regulated under LN in the three barley genotypes investigated. Genes encoding key enzymes required for lysine biosynthesis in plants, dihydrodipicolinate synthase (DHPS) and the catabolic enzyme, the bifunctional Lys-ketoglutarate reductase/saccharopine dehydrogenase are up-regulated in Laanaceur and likely account for a hyperaccumulation of lysine in this genotype. Our work provides key physiological markers of North African barley response to low N availability in the early developmental stages.

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Section: Inoculum Preparation and Pathogen Infectionmentioning

confidence: 99%

Genotypic Variation of Nitrogen Use Efficiency and Amino Acid Metabolism in Barley

et al. 2022

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“… Backes et al. (2021) also reported a similar effect in barley inoculated with a different strain belonging to the same genus: Burkholderia sp.…”

Section: Plant Ecophysiology As a Tool To Assess Plant’s Perception O...mentioning

confidence: 63%

“…Among the considered research articles, leaf gas exchange was measured only by Backes et al. (2021) , while fluorescence was taken into account in other studies evaluating the plant response to pathogens in the presence of PGPR.…”

Section: Plant Ecophysiology As a Tool To Assess Plant’s Perception O...mentioning

confidence: 99%

A plant’s perception of growth-promoting bacteria and their metabolites

Abou Jaoudé,

Luziatelli,

Ficca

et al. 2024

Front. Plant Sci.

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Many recent studies have highlighted the importance of plant growth-promoting (rhizo)bacteria (PGPR) in supporting plant’s development, particularly under biotic and abiotic stress. Most focus on the plant growth-promoting traits of selected strains and the latter’s effect on plant biomass, root architecture, leaf area, and specific metabolite accumulation. Regarding energy balance, plant growth is the outcome of an input (photosynthesis) and several outputs (i.e., respiration, exudation, shedding, and herbivory), frequently neglected in classical studies on PGPR-plant interaction. Here, we discuss the primary evidence underlying the modifications triggered by PGPR and their metabolites on the plant ecophysiology. We propose to detect PGPR-induced variations in the photosynthetic activity using leaf gas exchange and recommend setting up the correct timing for monitoring plant responses according to the specific objectives of the experiment. This research identifies the challenges and tries to provide future directions to scientists working on PGPR-plant interactions to exploit the potential of microorganisms’ application in improving plant value.

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“…Paenibacillus polymyxa KaI245 and Burkholderia sp. BE25 exhibited strong biocontrol activity against foliar diseases of barley both in vitro and in the greenhouse [ 17 , 18 ]. In addition, plant systemic immunity can also be influenced by microbial secondary metabolites, such as the quorum sensing molecules N -acyl homoserine lactones (AHL).…”

Section: Introductionmentioning

confidence: 99%

Hordeum vulgare differentiates its response to beneficial bacteria

Duan,

Han,

Grimm

et al. 2023

BMC Plant Biol

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Background In nature, beneficial bacteria triggering induced systemic resistance (ISR) may protect plants from potential diseases, reducing yield losses caused by diverse pathogens. However, little is known about how the host plant initially responds to different beneficial bacteria. To reveal the impact of different bacteria on barley (Hordeum vulgare), bacterial colonization patterns, gene expression, and composition of seed endophytes were explored. Results This study used the soil-borne Ensifer meliloti, as well as Pantoea sp. and Pseudomonas sp. isolated from barley seeds, individually. The results demonstrated that those bacteria persisted in the rhizosphere but with different colonization patterns. Although root-leaf translocation was not observed, all three bacteria induced systemic resistance (ISR) against foliar fungal pathogens. Transcriptome analysis revealed that ion- and stress-related genes were regulated in plants that first encountered bacteria. Iron homeostasis and heat stress responses were involved in the response to E. meliloti and Pantoea sp., even if the iron content was not altered. Heat shock protein-encoding genes responded to inoculation with Pantoea sp. and Pseudomonas sp. Furthermore, bacterial inoculation affected the composition of seed endophytes. Investigation of the following generation indicated that the enhanced resistance was not heritable. Conclusions Here, using barley as a model, we highlighted different responses to three different beneficial bacteria as well as the influence of soil-borne Ensifer meliloti on the seed microbiome. In total, these results can help to understand the interaction between ISR-triggering bacteria and a crop plant, which is essential for the application of biological agents in sustainable agriculture.

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A biological agent modulates the physiology of barley infected with Drechslera teres

Cited by 9 publications

References 86 publications

Genotypic Variation of Nitrogen Use Efficiency and Amino Acid Metabolism in Barley

Genotypic Variation of Nitrogen Use Efficiency and Amino Acid Metabolism in Barley

A plant’s perception of growth-promoting bacteria and their metabolites

Hordeum vulgare differentiates its response to beneficial bacteria

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