scholarly journals Identification of Plant Growth Promoting Bacteria Within Space Crop Production Systems

2021 ◽  
Vol 8 ◽  
Author(s):  
David Handy ◽  
Mary E. Hummerick ◽  
Anirudha R. Dixit ◽  
Anna Maria Ruby ◽  
Gioia Massa ◽  
...  
Keyword(s):  
Plant Growth ◽  
Crop Production ◽  
Plant Pathogens ◽  
Life Support ◽  
Production Systems ◽  
Space Station ◽  
Fungal Species ◽  
Plant Growth Promoting Bacteria ◽  
Plant Growth Promoting ◽  
Growth Promoting

As we establish colonies beyond Earth, resupply missions will become increasingly difficult, logistically speaking, and less frequent. As a result, the on-site production of plants will be mission critical for both food production as well as complementing life support systems. Previous research on space crop production aboard the International Space Station (ISS) has determined that the spaceflight environment, though capable of supporting plant growth, is inherently stressful to plants. The combined stressors of this environment limits yield by inhibiting growth, as well as increasing susceptibility to infection by plant pathogens such as Fusarium spp. We propose that a consortium of space-viable, plant growth-promoting bacteria (PGPB) could assist in mitigating challenges to plant growth in a sustainable fashion. Here, we utilize biochemical and phenotypic assessments to identify potential PGPB derived from previously acquired isolates from the VEGGIE crop production system aboard the ISS. These assays confirmed the presence of bacteria capable of producing and/or interfering with plant hormones, facilitating plant uptake of high-value target nutrients for plants such as iron and phosphorus, and able to inhibit the growth of problematic fungal species. We discuss our findings with regards to their potential to support plant growth aboard spaceflight platforms as well as the Moon and Mars.

scholarly journals Genomic Mining and Physiological Characterization of new Halophilic Plant Growth Promoting Bacilli

2021 ◽  
Author(s):  
Claudia Petrillo ◽  
Stefany Castaldi ◽  
Mariamichela Lanzilli ◽  
Matteo Selci ◽  
Angelina Cordone ◽  
...  
Keyword(s):  
Plant Growth ◽  
Crop Production ◽  
Growth Promotion ◽  
Biological Activities ◽  
Gene Clusters ◽  
Plant Growth Promoting Bacteria ◽  
Dual Culture ◽  
Whole Genome Analysis ◽  
Plant Growth Promoting ◽  
Growth Promoting

Massive application of chemical fertilizers and pesticides has been the main strategy used to cope with the rising crop demands in the last decades. The indiscriminate use of chemicals while providing a temporary solution has led to a decrease in crop productivity and an increase in the environmental impact of modern agriculture. A sustainable alternative to the use of chemicals for crop production is the use of microorganisms naturally capable of enhancing plant growth and protecting crops from pests, known as Plant-Growth-Promoting Bacteria (PGPB). The aim of the present study was to isolate and characterize PGPB from salt-pans sand samples able to ameliorate plant fitness. To survive high salinity, salt-tolerant microbes produce a broad range of compounds with heterogeneous biological activities that are potentially beneficial for plant growth. We have isolated and screened in vitro a total of 20 halophilic spore-forming bacteria for phyto-beneficial traits and compared the results with two rhizosphere Bacilli recently isolated from the rhizosphere of the same collection site and recently characterized as potential biocontrol agents. Whole-genome analysis on five selected halophilic strains confirmed the presence of numerous gene clusters with PGP and biocontrol functions and of novel secondary-metabolite biosynthetic genes potentially involved in plant growth promotion and protection. The predicted biocontrol potential was confirmed in dual culture assays against several phytopathogenic fungi and bacteria. Interestingly, the absence of predicted gene clusters with known biocontrol functions in some of the isolates was not predictive of the in vivo results, supporting the need of combining laboratory assays and genome mining in PGPB identification for future applications.

scholarly journals Synergistic and offset effects of fungal species combinations on plant performance

2021 ◽  
Author(s):  
Yoshie Hori ◽  
Hiroaki Fujita ◽  
Kei Hiruma ◽  
Kazuhiko Narisawa ◽  
Hirokazu Toju
Keyword(s):  
Plant Growth ◽  
Synergistic Effects ◽  
Dry Weight ◽  
Fungal Species ◽  
Plant Performance ◽  
Plant Growth Promoting Bacteria ◽  
Microbial Species ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Dual Inoculation

In natural and agricultural ecosystems, survival and growth of plants depend substantially on microbes in the endosphere and rhizosphere. Although numerous studies have reported the presence of plant-growth promoting bacteria and fungi in below-ground biomes, it remains a major challenge to understand how sets of microbial species positively or negatively affect plants' performance. By conducting a series of single- and dual-inoculation experiments of 13 endophytic and soil fungi targeting a Brassicaceae plant species, we here evaluated how microbial effects on plants depend on presence/absence of co-occurring microbes. The comparison of single- and dual-inoculation experiments showed that combinations of the fungal isolates with the highest plant-growth promoting effects in single inoculations did not yield highly positive impacts on plant performance traits (e.g., shoot dry weight). In contrast, pairs of fungi including small/moderate contributions to plants in single-inoculation contexts showed the greatest effects on plants among the 78 fungal pairs examined. These results on the offset and synergistic effects of pairs of microbes suggest that inoculation experiments of single microbial species/isolates can result in the overestimation or underestimation of microbial functions in multi-species contexts. Because keeping single-microbe systems in outdoor conditions is impractical, designing sets of microbes that can maximize performance of crop plants is an important step for the use of microbial functions in sustainable agriculture.

scholarly journals Importance of plant growth promoting rhizobacteria (PGPR) in agriculture: A Review

2020 ◽  
Vol 35 (1-2) ◽  
Author(s):  
Tabish Akhtar ◽  
Shubham Kumar ◽  
Sukhdeo Kumar ◽  
M. R. Meena
Keyword(s):  
Plant Growth ◽  
Crop Production ◽  
Plant Pathogens ◽  
Crop Yields ◽  
Plant Growth Promoting Rhizobacteria ◽  
Agricultural Industry ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Increasing Demand ◽  
Environmentally Sound

The growth of plants promoting rhizobacteria (PGPR) has gained widespread importance in agriculture. These are beneficial bacteria found in nature that live actively in plant roots and improve plant growth and increase agricultural productivity.. (PGPR) promoting plant growth shows an important role in the sustainable agricultural industry. The increasing demand for crop production is a major challenge nowadays, with a significant lack of use of synthetic chemical fertilizers and pesticides. The use of PGPR has proven to be an environmentally sound way of increasing crop yields by facilitating plant growth through direct or indirect mechanisms. The mechanisms of PGPR include regulating hormonal and nutritional balance, inducing resistance against plant pathogens, and dissolving nutrients for easy uptake by plants. Furthermore, PGPRs show synergistic and antagonistic interactions with microorganisms within the rhizosphere and in bulk soils, which indirectly increases plant growth rates. There are several bacteria species that act as PGPR. This review summarizes the methodology of PGPR as a bio-fertilizer in agriculture.

scholarly journals The role of Plant Growth Promoting Bacteria in improving nitrogen use efficiency for sustainable crop production: a focus on wheat

2017 ◽  
Vol 3 (3) ◽  
pp. 413-434 ◽  
Author(s):  
Nilde Antonella Di Benedetto ◽  
◽  
Maria Rosaria Corbo ◽  
Daniela Campaniello ◽  
Mariagrazia Pia Cataldi ◽  
...  
Keyword(s):  
Plant Growth ◽  
Nitrogen Use Efficiency ◽  
Crop Production ◽  
Plant Growth Promoting Bacteria ◽  
Nitrogen Use ◽  
Sustainable Crop Production ◽  
Plant Growth Promoting ◽  
Use Efficiency ◽  
Growth Promoting

scholarly journals Micro-remediation of chromium contaminated soils

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e6076 ◽  
Author(s):  
Hadia -e- Fatima ◽  
Ambreen Ahmed
Keyword(s):  
Plant Growth ◽  
Contaminated Soils ◽  
Crop Production ◽  
Lens Culinaris ◽  
Production Plant ◽  
Plant Growth Promoting Bacteria ◽  
Bacterial Strains ◽  
Soil Release ◽  
Plant Growth Promoting ◽  
Growth Promoting

Bacteria are tiny organisms which are ubiquitously found in the environment. These microscopic living bodies are responsible for the flow of nutrients in biogeochemical cycles and fertility imparted to the soil. Release of excessive chromium in agricultural soils due to rapid growth of industries may result in minimizing the fertility of soil in future, which will lead to reduction in crop production. Plant growth promoting bacteria (PGPB) are beneficial to the environment, some of which can tolerate chromium and protect plants against heavy metal stress. The current study aims to identify such chromium-tolerant auxin-producing rhizobacteria and to investigate their inoculation effects on the growth characteristics of Lens culinaris in chromium polluted soils by using two different chromium salts i.e., K2Cr2O7 and K2CrO4 in varying concentrations (0, 50, 100, 200, 400 and 500 µgml−1). The results revealed that Bacillus species are efficient in significantly reducing the deleterious effects of Cr. These effective bacterial strains were able to stimulate the growth of metal effected plants of Lens culinaris which were grown in chromium contaminated environment. Therefore, these plant growth promoting rhizobacteria PGPRs, having both auxin production potential and chromium-resistance ability, are considered as efficient micro-factories against chromium pollution.

Potential application of plant growth promoting bacteria in bioenergy crop production

2021 ◽  
pp. 109-123
Author(s):  
Chuansheng Mei ◽  
Sajeewa Amaradasa ◽  
Masoumeh Sikaroodi ◽  
Xunzhong Zhang ◽  
Patrick Gillevet ◽  
...  
Keyword(s):  
Plant Growth ◽  
Potential Application ◽  
Crop Production ◽  
Plant Growth Promoting Bacteria ◽  
Bioenergy Crop ◽  
Plant Growth Promoting ◽  
Growth Promoting

Azospirillum plant growth-promoting strains are nonpathogenic on tomato, pepper, cotton, and wheat

1998 ◽  
Vol 44 (2) ◽  
pp. 168-174 ◽  
Author(s):  
Yoav Bashan
Keyword(s):  
Plant Growth ◽  
Plant Species ◽  
Pseudomonas Syringae ◽  
Xanthomonas Campestris ◽  
Plant Pathogens ◽  
Dry Weight ◽  
Plant Growth Promoting Bacteria ◽  
Disease Symptoms ◽  
Plant Growth Promoting ◽  
Growth Promoting

Six strains of Azospirillum belonging to five species of plant growth-promoting bacteria (A. brasilense, A. lipoferum, A. amazonense, A. irakense, and A. halopraeference) did not cause visible disease symptoms on the roots or leaves of tomato, pepper, cotton, and wheat, failed to inhibit seed germination, and did not reduce plant dry weight when seven standard techniques for the inoculation of plant pathogens were used. Similar inoculation conditions with plant pathogens (Pseudomonas syringae pv. tomato, Xanthomonas campestris pv. vesicatoria, Xanthomonas campestris pv. translucens, and Xanthomonas campestris pv. malvacearum) induced typical disease symptoms. None of Azospirillum strains caused the hypersensitive reaction on eggplant, whereas all pathogens did. All Azospirillum strains increased phytoalexin production in all disease-resistant plant species to moderate levels, but the levels were significantly lower than those induced by the compatible pathogens. The various phytoalexins produced in plants had the capacity to inhibit growth of all Azospirillum strains. Azospirillum amazonense, A. irakense, and A. halopraeference had no apparent effect on plant growth, while A. brasilense and A. lipoferum increased the dry weight of all plant species. Under partial mist conditions, all Azospirillum strains were capable of colonizing leaf surfaces (103-107 cfu/g dry weight) regardless of the plant species. These results provide experimental evidence that Azospirillum sp. might be considered safe for the inoculation of several plant species.Key words: Azospirillum, beneficial bacteria, environmental protection, plant inoculation, plant growth-promoting bacteria.

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