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Gfeller V, Waelchli J, Pfister S, Deslandes-Hérold G, Mascher F, Glauser G, Aeby Y, Mestrot A, Robert CAM, Schlaeppi K, Erb M. Plant secondary metabolite-dependent plant-soil feedbacks can improve crop yield in the field. eLife 2023; 12:e84988. [PMID: 37526647 PMCID: PMC10393292 DOI: 10.7554/elife.84988] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2022] [Accepted: 07/04/2023] [Indexed: 08/02/2023] Open
Abstract
Plant secondary metabolites that are released into the rhizosphere alter biotic and abiotic soil properties, which in turn affect the performance of other plants. How this type of plant-soil feedback affects agricultural productivity and food quality in the field in the context of crop rotations is unknown. Here, we assessed the performance, yield and food quality of three winter wheat varieties growing in field plots whose soils had been conditioned by either wild type or benzoxazinoid-deficient bx1 maize mutant plants. Following maize cultivation, we detected benzoxazinoid-dependent chemical and microbial fingerprints in the soil. The benzoxazinoid fingerprint was still visible during wheat growth, but the microbial fingerprint was no longer detected. Wheat emergence, tillering, growth, and biomass increased in wild type conditioned soils compared to bx1 mutant conditioned soils. Weed cover was similar between soil conditioning treatments, but insect herbivore abundance decreased in benzoxazinoid-conditioned soils. Wheat yield was increased by over 4% without a reduction in grain quality in benzoxazinoid-conditioned soils. This improvement was directly associated with increased germination and tillering. Taken together, our experiments provide evidence that soil conditioning by plant secondary metabolite producing plants can increase yield via plant-soil feedbacks under agronomically realistic conditions. If this phenomenon holds true across different soils and environments, optimizing root exudation chemistry could be a powerful, genetically tractable strategy to enhance crop yields without additional inputs.
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Affiliation(s)
- Valentin Gfeller
- Institute of Plant Sciences, University of Bern, Bern, Switzerland
| | - Jan Waelchli
- Department of Environmental Sciences, University of Basel, Basel, Switzerland
| | | | | | - Fabio Mascher
- Department of Plant Breeding, Agroscope, Nyon, Switzerland
| | - Gaetan Glauser
- Platform of Analytical Chemistry, Université de Neuchâtel, Neuchâtel, Switzerland
| | - Yvo Aeby
- Research contracts animals group, Agroscope, Posieux, Switzerland
| | - Adrien Mestrot
- Institute of Geography, University of Bern, Bern, Switzerland
| | | | - Klaus Schlaeppi
- Institute of Plant Sciences, University of Bern, Bern, Switzerland
- Department of Environmental Sciences, University of Basel, Basel, Switzerland
| | - Matthias Erb
- Institute of Plant Sciences, University of Bern, Bern, Switzerland
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Wang P, Lopes LD, Lopez-Guerrero MG, van Dijk K, Alvarez S, Riethoven JJ, Schachtman DP. Natural variation in root exudation of GABA and DIMBOA impacts the maize root endosphere and rhizosphere microbiomes. JOURNAL OF EXPERIMENTAL BOTANY 2022; 73:5052-5066. [PMID: 35552399 DOI: 10.1093/jxb/erac202] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Accepted: 05/05/2022] [Indexed: 06/15/2023]
Abstract
Root exudates are important for shaping root-associated microbiomes. However, studies on a wider range of metabolites in exudates are required for a comprehensive understanding about their influence on microbial communities. We identified maize inbred lines that differ in exudate concentrations of 2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one (DIMBOA) and γ-aminobutyric acid (GABA) using a semi-hydroponic system. These lines were grown in the field to determine the changes in microbial diversity and gene expression due to varying concentrations of DIMBOA and GABA in exudates using 16S rRNA amplicon sequencing and metatranscriptomics. Results showed individual and interaction effects of DIMBOA and GABA on the rhizosphere and root endosphere β-diversity, most strongly at the V10 growth stage. The main bacterial families affected by both compounds were Ktedonobacteraceae and Xanthomonadaceae. Higher concentrations of DIMBOA in exudates affected the rhizosphere metatranscriptome, enriching for metabolic pathways associated with plant disease. This study validated the use of natural variation within plant species as a powerful approach for understanding the role of root exudates on microbiome selection. We also showed that a semi-hydroponic system can be used to identify maize genotypes that differ in GABA and DIMBOA exudate concentrations under field conditions. The impact of GABA exudation on root-associated microbiomes is shown for the first time.
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Affiliation(s)
- Peng Wang
- Center for Plant Science Innovation, University of Nebraska-Lincoln, Lincoln, NE, USA and Department of Agronomy and Horticulture, University of Nebraska-Lincoln, Lincoln, NE, USA
- Nebraska Center for Biotechnology, University of Nebraska-Lincoln, Lincoln, NE, USA
| | - Lucas Dantas Lopes
- Center for Plant Science Innovation, University of Nebraska-Lincoln, Lincoln, NE, USA and Department of Agronomy and Horticulture, University of Nebraska-Lincoln, Lincoln, NE, USA
- Nebraska Center for Biotechnology, University of Nebraska-Lincoln, Lincoln, NE, USA
| | | | - Karin van Dijk
- Department of Biochemistry, University of Nebraska-Lincoln, Lincoln, NE, USA
| | - Sophie Alvarez
- Nebraska Center for Biotechnology, University of Nebraska-Lincoln, Lincoln, NE, USA
- Proteomics and Metabolomics Facility, Nebraska Center for Biotechnology, University of Nebraska-Lincoln, Lincoln, NE, USA
| | - Jean-Jack Riethoven
- Nebraska Center for Biotechnology, University of Nebraska-Lincoln, Lincoln, NE, USA
- Bioinformatics Core Facility, Nebraska Center for Biotechnology, University of Nebraska-Lincoln, Lincoln, NE, USA
| | - Daniel P Schachtman
- Center for Plant Science Innovation, University of Nebraska-Lincoln, Lincoln, NE, USA and Department of Agronomy and Horticulture, University of Nebraska-Lincoln, Lincoln, NE, USA
- Nebraska Center for Biotechnology, University of Nebraska-Lincoln, Lincoln, NE, USA
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Hu L, Wu Z, Robert CAM, Ouyang X, Züst T, Mestrot A, Xu J, Erb M. Soil chemistry determines whether defensive plant secondary metabolites promote or suppress herbivore growth. Proc Natl Acad Sci U S A 2021; 118:e2109602118. [PMID: 34675080 PMCID: PMC8639379 DOI: 10.1073/pnas.2109602118] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/10/2021] [Indexed: 01/26/2023] Open
Abstract
Plant secondary (or specialized) metabolites mediate important interactions in both the rhizosphere and the phyllosphere. If and how such compartmentalized functions interact to determine plant-environment interactions is not well understood. Here, we investigated how the dual role of maize benzoxazinoids as leaf defenses and root siderophores shapes the interaction between maize and a major global insect pest, the fall armyworm. We find that benzoxazinoids suppress fall armyworm growth when plants are grown in soils with very low available iron but enhance growth in soils with higher available iron. Manipulation experiments confirm that benzoxazinoids suppress herbivore growth under iron-deficient conditions and in the presence of chelated iron but enhance herbivore growth in the presence of free iron in the growth medium. This reversal of the protective effect of benzoxazinoids is not associated with major changes in plant primary metabolism. Plant defense activation is modulated by the interplay between soil iron and benzoxazinoids but does not explain fall armyworm performance. Instead, increased iron supply to the fall armyworm by benzoxazinoids in the presence of free iron enhances larval performance. This work identifies soil chemistry as a decisive factor for the impact of plant secondary metabolites on herbivore growth. It also demonstrates how the multifunctionality of plant secondary metabolites drives interactions between abiotic and biotic factors, with potential consequences for plant resistance in variable environments.
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Affiliation(s)
- Lingfei Hu
- Institute of Soil and Water Resources and Environmental Science, College of Environmental and Resource Sciences, Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, Zhejiang University, Hangzhou 310058, China
- Institute of Plant Sciences, University of Bern, 3013 Bern, Switzerland
| | - Zhenwei Wu
- Institute of Soil and Water Resources and Environmental Science, College of Environmental and Resource Sciences, Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, Zhejiang University, Hangzhou 310058, China
| | | | - Xiao Ouyang
- Institute of Soil and Water Resources and Environmental Science, College of Environmental and Resource Sciences, Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, Zhejiang University, Hangzhou 310058, China
| | - Tobias Züst
- Institute of Plant Sciences, University of Bern, 3013 Bern, Switzerland
| | - Adrien Mestrot
- Institute of Geography, University of Bern, 3012 Bern, Switzerland
| | - Jianming Xu
- Institute of Soil and Water Resources and Environmental Science, College of Environmental and Resource Sciences, Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, Zhejiang University, Hangzhou 310058, China;
| | - Matthias Erb
- Institute of Plant Sciences, University of Bern, 3013 Bern, Switzerland;
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Hu L, Mateo P, Ye M, Zhang X, Berset JD, Handrick V, Radisch D, Grabe V, Köllner TG, Gershenzon J, Robert CAM, Erb M. Plant iron acquisition strategy exploited by an insect herbivore. Science 2018; 361:694-697. [PMID: 30115808 DOI: 10.1126/science.aat4082] [Citation(s) in RCA: 63] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2018] [Accepted: 06/19/2018] [Indexed: 12/24/2022]
Abstract
Insect herbivores depend on their host plants to acquire macro- and micronutrients. Here we asked how a specialist herbivore and damaging maize pest, the western corn rootworm, finds and accesses plant-derived micronutrients. We show that the root-feeding larvae use complexes between iron and benzoxazinoid secondary metabolites to identify maize as a host, to forage within the maize root system, and to increase their growth. Maize plants use these same benzoxazinoids for protection against generalist herbivores and, as shown here, for iron uptake. We identify an iron transporter that allows the corn rootworm to benefit from complexes between iron and benzoxazinoids. Thus, foraging for an essential plant-derived complex between a micronutrient and a secondary metabolite shapes the interaction between maize and a specialist herbivore.
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Affiliation(s)
- L Hu
- Institute of Plant Sciences, University of Bern, Switzerland
| | - P Mateo
- Institute of Plant Sciences, University of Bern, Switzerland.,Neuchâtel Platform of Analytical Chemistry, University of Neuchâtel, Switzerland
| | - M Ye
- Institute of Plant Sciences, University of Bern, Switzerland
| | - X Zhang
- Institute of Plant Sciences, University of Bern, Switzerland
| | - J D Berset
- Institute of Plant Sciences, University of Bern, Switzerland
| | - V Handrick
- Max Planck Institute for Chemical Ecology, Jena, Germany
| | - D Radisch
- Max Planck Institute for Chemical Ecology, Jena, Germany
| | - V Grabe
- Max Planck Institute for Chemical Ecology, Jena, Germany
| | - T G Köllner
- Max Planck Institute for Chemical Ecology, Jena, Germany
| | - J Gershenzon
- Max Planck Institute for Chemical Ecology, Jena, Germany
| | - C A M Robert
- Institute of Plant Sciences, University of Bern, Switzerland.
| | - M Erb
- Institute of Plant Sciences, University of Bern, Switzerland.
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Di Marco VB, Bombi GG. Electrospray mass spectrometry (ESI-MS) in the study of metal-ligand solution equilibria. MASS SPECTROMETRY REVIEWS 2006; 25:347-79. [PMID: 16369936 DOI: 10.1002/mas.20070] [Citation(s) in RCA: 215] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
In the 20 years, since the introduction of electrospray mass spectrometry (ESI-MS), the use of this technique in various fields of inorganic, organometallic, and analytical chemistry has been steadily increasing. In this study, the application of ESI-MS to the study of metal-ligand solution equilibria is reviewed (till 2004 included). In a first section, advantages and drawbacks of ESI-MS in this type of application are described. Subsequently, a list of ca. 300 studies is reported, in which ESI-MS was used to give number and stoichiometry of the species at equilibrium, or also to estimate their stability constants. All studies are classified according to the metal ions under examination. Other related applications, such as host-guest interactions and metal ion-protein binding studies, are briefly reviewed as well.
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Scherlitz-Hofmann I, Dubs M, Krieg R, Schönecker B, Kluge M, Sicker D. Hybridnaturstoffe: Synthese cyclischer Hydroxamsäuren der Estra-1,3,5(10)-trien-Reihe. Helv Chim Acta 2004. [DOI: 10.1002/hlca.19970800807] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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