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Agronomy
Special Issues
Potential of Bacterial Endophytes as Crop Growth Promoting Factors
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Potential of Bacterial Endophytes as Crop Growth Promoting Factors

A special issue of Agronomy (ISSN 2073-4395). This special issue belongs to the section "Farming Sustainability".

Deadline for manuscript submissions: closed (30 June 2021) | Viewed by 29776

Special Issue Editors

Prof. Dr. Encarna Velazquez

E-Mail Website
Guest Editor
Microbiología y Genética, University of Salamanca, Salamanca, Spain
Interests: endophytic bacteria; bacterial diversity; plant–microbe interactions; bacterial plant probiotics; rhizobia
Special Issues, Collections and Topics in MDPI journals
Prof. Fernando González-Andrés

E-Mail Website
Guest Editor
Institute of Environment, Natural Resources and Biodiversity, Universidad de León, León, Spain
Interests: agronomy of microbial plant biostimulants; formulation of microbial plant biostimulants
Dr. José David Flores-Félix

E-Mail Website
Guest Editor
Lab 237, Edif Departamental de Biología, Universidad de Salamanca, 37007 Salamanca, Spain
Interests: microbiology; rhizobium; PGPB
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Microbial endophytes comprise a wide range of bacteria inhabiting the inner tissues of plants which can enhance the plant growth. Within these bacteria, those living inside the nodules of legumes and the roots of every plant are of particular interest, as they are promising crop-growth-promoting factors. Nevertheless, most works to date have focused on basic scientific aspects of plant-growth-promoting microorganisms, and those dealing with their agronomic performance are still scarce. Moreover, in most cases these works only reach the microcosm level and those based on field trials have used non-formulated endophytic strains. Therefore, an adequate formulation of bacterial endophytes which allows an advantageous competitive situation is very important to achieve the expected function in field conditions.

On the other hand, the advances in genomics have allowed the genome analysis of cultured and uncultured bacterial endophytes which are presented as a useful tool for the selection of agronomically efficient strains, but at the present moment more works are needed to approach genomic and agronomic results, to make them coherently related.

This Special Issue will focus on the agronomic aspects of endophytes as crop-growth-promoting factors, and gather all the available technologies to improve the knowledge necessary to develop agronomically effective bacterial plant biostimulants (BPBs).

Prof. Encarna Velazquez
Prof. Fernando González-Andrés
Dr. José David Flores-Félix
Guest Editors

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. Agronomy 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 2600 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

bacterial plant；

biostimulants;

BPB;

bacterial endophytes;

extensive crops;

horticultural crops;

forest crops;

genomics;

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Published Papers (3 papers)

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Research

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12 pages, 588 KiB  
Article
Identification of Canola Roots Endophytic Bacteria and Analysis of Their Potential as Biofertilizers for Canola Crops with Special Emphasis on Sporulating Bacteria
by Pilar Martínez-Hidalgo, José David Flores-Félix, Fernando Sánchez-Juanes, Raúl Rivas, Pedro F. Mateos, Ignacio Santa Regina, Álvaro Peix, Eustoquio Martínez-Molina, José M. Igual and Encarna Velázquez
Agronomy 2021, 11(9), 1796; https://doi.org/10.3390/agronomy11091796 - 8 Sep 2021
Cited by 19 | Viewed by 3671
Abstract
Canola (Brassica napus L. var. oleracea) is the third most common oil-producing crop worldwide after palm and soybean. Canola cultivation requires the use of chemical fertilizers, but the amount required can be reduced by applying plant growth-promoting bacteria (PGPB). Among PGPB, endophytic [...] Read more.
Canola (Brassica napus L. var. oleracea) is the third most common oil-producing crop worldwide after palm and soybean. Canola cultivation requires the use of chemical fertilizers, but the amount required can be reduced by applying plant growth-promoting bacteria (PGPB). Among PGPB, endophytic bacteria have certain advantages as biofertilizers, but canola endophytic bacteria have rarely been studied. In this work, we identified a collection of bacterial endophytes isolated from canola roots using MALDI-TOF MS, a technique that is still rarely used for the identification of such bacteria, and rrs gene sequencing, a methodology that is commonly used to identify canola endophytes. The results demonstrated that some bacterial isolates from canola roots belonged to the genera Bacillus, Neobacillus, Peribacillus (Pe.), and Terribacillus, but most isolates belonged to the genera Paenibacillus (P.) and Pseudomonas (Ps.). Inoculation of these isolates indicated that several of them could efficiently promote canola seedling growth in hydroponic conditions. These results were then confirmed in a microcosm experiment using agricultural soil, which demonstrated that several isolates of Pseudomonas thivervalensis, Paenibacillus amylolyticus, Paenibacillus polymyxa, Paenibacillus sp. (Paenibacillus glucanolyticus/Paenibacillus lautus group), and Peribacillus simplex (previously Bacillus simplex) could efficiently promote canola shoot growth under greenhouse conditions. Among them, the isolates of Paenibacillus and Peribacillus were the most promising biofertilizers for canola crops as they are sporulated rods, which is an advantageous trait when formulating biofertilizers. Full article
(This article belongs to the Special Issue Potential of Bacterial Endophytes as Crop Growth Promoting Factors)
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12 pages, 866 KiB  
Article
Connecting the Lab and the Field: Genome Analysis of Phyllobacterium and Rhizobium Strains and Field Performance on Two Vegetable Crops
by José David Flores-Félix, Encarna Velázquez, Eustoquio Martínez-Molina, Fernando González-Andrés, Andrea Squartini and Raúl Rivas
Agronomy 2021, 11(6), 1124; https://doi.org/10.3390/agronomy11061124 - 31 May 2021
Cited by 10 | Viewed by 3313
Abstract
The legume nodules are a rich source not only of rhizobia but also of endophytic bacteria exhibiting plant growth-promoting mechanisms with potential as plant biostimulants. In this work we analyzed the genomes of Phyllobacterium endophyticum PEPV15 and Rhizobium laguerreae PEPV16 strains, both isolated [...] Read more.
The legume nodules are a rich source not only of rhizobia but also of endophytic bacteria exhibiting plant growth-promoting mechanisms with potential as plant biostimulants. In this work we analyzed the genomes of Phyllobacterium endophyticum PEPV15 and Rhizobium laguerreae PEPV16 strains, both isolated from Phaseolus vulgaris nodules. In silico analysis showed that the genomes of these two strains contain genes related to N-acyl-homoserine lactone (AHL) and cellulose biosynthesis, involved in quorum sensing and biofilm formation, which are essential for plant colonization. Several genes involved in plant growth promotion such as those related to phosphate solubilization, indole acetic acid production, siderophore biosynthesis and nitrogen fixation were also located in both genomes. When strains PEPV15 and PEPV16 were inoculated in lettuce and carrot in field assays, we found that both significantly increased the yield of lettuce shoots and carrot roots by more than 20% and 10%, respectively. The results of this work confirmed that the genome mining of genes involved in plant colonization and growth promotion is a good strategy for predicting the potential of bacterial strains as crops inoculants, opening new horizons for the selection of bacterial strains with which to design new, effective bacteria-based plant biostimulants. Full article
(This article belongs to the Special Issue Potential of Bacterial Endophytes as Crop Growth Promoting Factors)
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Review

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24 pages, 1646 KiB  
Review
Plant Growth Stimulation by Microbial Consortia
by Gustavo Santoyo, Paulina Guzmán-Guzmán, Fannie Isela Parra-Cota, Sergio de los Santos-Villalobos, Ma. del Carmen Orozco-Mosqueda and Bernard R. Glick
Agronomy 2021, 11(2), 219; https://doi.org/10.3390/agronomy11020219 - 24 Jan 2021
Cited by 181 | Viewed by 21611
Abstract
Plant-associated microorganisms play an important role in agricultural production. Although various studies have shown that single microorganisms can exert beneficial effects on plants, it is increasingly evident that when a microbial consortium—two or more interacting microorganisms—is involved, additive or synergistic results can be [...] Read more.
Plant-associated microorganisms play an important role in agricultural production. Although various studies have shown that single microorganisms can exert beneficial effects on plants, it is increasingly evident that when a microbial consortium—two or more interacting microorganisms—is involved, additive or synergistic results can be expected. This occurs, in part, due to the fact that multiple species can perform a variety of tasks in an ecosystem like the rhizosphere. Therefore, the beneficial mechanisms of plant growth stimulation (i.e., enhanced nutrient availability, phytohormone modulation, biocontrol, biotic and abiotic stress tolerance) exerted by different microbial players within the rhizosphere, such as plant-growth-promoting bacteria (PGPB) and fungi (such as Trichoderma and Mycorrhizae), are reviewed. In addition, their interaction and beneficial activity are highlighted when they act as part of a consortium, mainly as mixtures of different species of PGPB, PGPB–Mycorrhizae, and PGPB–Trichoderma, under normal and diverse stress conditions. Finally, we propose the expansion of the use of different microbial consortia, as well as an increase in research on different mixtures of microorganisms that facilitate the best and most consistent results in the field. Full article
(This article belongs to the Special Issue Potential of Bacterial Endophytes as Crop Growth Promoting Factors)
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