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Metabolites
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Metabolomics in Plant–Microbe Interactions to Alleviate Abiotic Stresses
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Metabolomics in Plant–Microbe Interactions to Alleviate Abiotic Stresses

A special issue of Metabolites (ISSN 2218-1989). This special issue belongs to the section "Plant Metabolism".

Deadline for manuscript submissions: closed (15 October 2021) | Viewed by 17317

Special Issue Editor

Dr. Maximino Manzanera

E-Mail Website
Guest Editor
Institute for Water Research, Department of Microbiology, University of Granada, 18003 Granada, Spain
Interests: drought tolerance; plant–microbe interactions; xeroprotectants; actinobacteria

Special Issue Information

Dear Colleagues,

The interactions between beneficial microorganisms and plants can result in the protection of plants from abiotic stresses, such as drought, salinity, floods, frost, or pollutants. However, complete understanding of the mechanisms at the metabolome level has not yet been achieved. Metabolites produced during symbiotic processes need to be characterized to understand the importance of the communication between plants and microorganisms for the survival of both organisms in an otherwise deleterious environment. The understanding of the metabolome during such interactions between microorganisms and their plant hosts is of great interest for the farming industry in order to reduce losses and protect crops.

In this Special Issue, we intend to provide new insights into the mechanisms that determine the protection of plants against abiotic stresses during interactions between microorganisms and their plant hosts. This Special Issue will particularly focus on the positive effects of microbe–plant interactions for plant tolerance to abiotic stresses, including but not limited to, drought, salinity, floods, frost, high temperatures, pollutants, or extreme pH, for improved application of this knowledge to increase crop production under harsh environmental conditions.

This Special Issue calls for original research articles, reviews, or opinions that will increase our understanding of fundamental and applied research related to beneficial microorganism–plant symbiosis for the improvement of agriculture under the adverse conditions derived from climate change.

Dr. Maximino Manzanera
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Metabolites is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Microbe–plant Interaction
  • Biostimulants
  • Abiotic stress tolerance
  • Metabolomics
  • Symbiosis

Published Papers (3 papers)

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Research

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18 pages, 1627 KiB  
Article
Plant Transcriptome Reprograming and Bacterial Extracellular Metabolites Underlying Tomato Drought Resistance Triggered by a Beneficial Soil Bacteria
by Rafael J. L. Morcillo, Juan I. Vílchez, Song Zhang, Richa Kaushal, Danxia He, Hailing Zi, Renyi Liu, Karsten Niehaus, Avtar K. Handa and Huiming Zhang
Metabolites 2021, 11(6), 369; https://doi.org/10.3390/metabo11060369 - 09 Jun 2021
Cited by 21 | Viewed by 3778
Abstract
Water deficit is one of the major constraints to crop production and food security worldwide. Some plant growth-promoting rhizobacteria (PGPR) strains are capable of increasing plant drought resistance. Knowledge about the mechanisms underlying bacteria-induced plant drought resistance is important for PGPR applications in [...] Read more.
Water deficit is one of the major constraints to crop production and food security worldwide. Some plant growth-promoting rhizobacteria (PGPR) strains are capable of increasing plant drought resistance. Knowledge about the mechanisms underlying bacteria-induced plant drought resistance is important for PGPR applications in agriculture. In this study, we show the drought stress-mitigating effects on tomato plants by the Bacillus megaterium strain TG1-E1, followed by the profiling of plant transcriptomic responses to TG1-E1 and the profiling of bacterial extracellular metabolites. Comparison between the transcriptomes of drought-stressed plants with and without TG1-E1 inoculation revealed bacteria-induced transcriptome reprograming, with highlights on differentially expressed genes belonging to the functional categories including transcription factors, signal transduction, and cell wall biogenesis and organization. Mass spectrometry-based analysis identified over 40 bacterial extracellular metabolites, including several important regulators or osmoprotectant precursors for increasing plant drought resistance. These results demonstrate the importance of plant transcriptional regulation and bacterial metabolites in PGPR-induced plant drought resistance. Full article
(This article belongs to the Special Issue Metabolomics in Plant–Microbe Interactions to Alleviate Abiotic Stresses)
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24 pages, 2537 KiB  
Article
The Metabolic Response of Brachypodium Roots to the Interaction with Beneficial Bacteria Is Affected by the Plant Nutritional Status
by Martino Schillaci, Cheka Kehelpannala, Federico Martinez-Seidel, Penelope M. C. Smith, Borjana Arsova, Michelle Watt and Ute Roessner
Metabolites 2021, 11(6), 358; https://doi.org/10.3390/metabo11060358 - 03 Jun 2021
Cited by 8 | Viewed by 3335
Abstract
The potential of plant growth promoting (PGP) bacteria in improving the performance of plants in suboptimal environments is increasingly acknowledged, but little information is available on the mechanisms underlying this interaction, particularly when plants are subjected to a combination of stresses. In this [...] Read more.
The potential of plant growth promoting (PGP) bacteria in improving the performance of plants in suboptimal environments is increasingly acknowledged, but little information is available on the mechanisms underlying this interaction, particularly when plants are subjected to a combination of stresses. In this study, we investigated the effects of the inoculation with the PGP bacteria Azospirillum brasilense (Azospirillum) on the metabolism of the model cereal Brachypodium distachyon (Brachypodium) grown at low temperatures and supplied with insufficient phosphorus. Investigating polar metabolite and lipid fluctuations during early plant development, we found that the bacteria initially elicited a defense response in Brachypodium roots, while at later stages Azospirillum reduced the stress caused by phosphorus deficiency and improved root development of inoculated plants, particularly by stimulating the growth of branch roots. We propose that the interaction of the plant with Azospirillum was influenced by its nutritional status: bacteria were sensed as pathogens while plants were still phosphorus sufficient, but the interaction became increasingly beneficial for the plants as their phosphorus levels decreased. Our results provide new insights on the dynamics of the cereal-PGP bacteria interaction, and contribute to our understanding of the role of beneficial microorganisms in the growth of cereal crops in suboptimal environments. Full article
(This article belongs to the Special Issue Metabolomics in Plant–Microbe Interactions to Alleviate Abiotic Stresses)
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Review

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19 pages, 4979 KiB  
Review
The Effects of Plant-Associated Bacterial Exopolysaccharides on Plant Abiotic Stress Tolerance
by Rafael J. L. Morcillo and Maximino Manzanera
Metabolites 2021, 11(6), 337; https://doi.org/10.3390/metabo11060337 - 24 May 2021
Cited by 111 | Viewed by 9344
Abstract
Plant growth-promoting rhizobacteria (PGPR) are beneficial soil microorganisms that can stimulate plant growth and increase tolerance to biotic and abiotic stresses. Some PGPR are capable of secreting exopolysaccharides (EPS) to protect themselves and, consequently, their plant hosts against environmental fluctuations and other abiotic [...] Read more.
Plant growth-promoting rhizobacteria (PGPR) are beneficial soil microorganisms that can stimulate plant growth and increase tolerance to biotic and abiotic stresses. Some PGPR are capable of secreting exopolysaccharides (EPS) to protect themselves and, consequently, their plant hosts against environmental fluctuations and other abiotic stresses such as drought, salinity, or heavy metal pollution. This review focuses on the enhancement of plant abiotic stress tolerance by bacterial EPS. We provide a comprehensive summary of the mechanisms through EPS to alleviate plant abiotic stress tolerance, including salinity, drought, temperature, and heavy metal toxicity. Finally, we discuss how these abiotic stresses may affect bacterial EPS production and its role during plant-microbe interactions. Full article
(This article belongs to the Special Issue Metabolomics in Plant–Microbe Interactions to Alleviate Abiotic Stresses)
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