Plant growth-promoting root-colonizing bacterial endophytes

Adeleke, Bartholomew Saanu; Babalola, Olubukola Oluranti; Glick, Bernard R.

doi:10.1016/j.rhisph.2021.100433

Cited by 70 publications

(42 citation statements)

References 141 publications

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“…ACC deaminase-related genes were transferred into salt-tolerant PGPB strains to regulate ethylene levels in halophytes and non-halophytes and improve salt tolerance [101]. Many bacterial endophytes can be cultured and can be directly applied to crops either by spraying, seed, or root inoculation [187]. A method for applying salt tolerant bacteria to agricultural production is to use bacterial capsules [188].…”

Section: Methods To Improve Symbiont Bacteria Utilizationmentioning

confidence: 99%

Progress and Applications of Plant Growth-Promoting Bacteria in Salt Tolerance of Crops

Gao

Zou

Wang

et al. 2022

IJMS

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Saline soils are a major challenge in agriculture, and salinization is increasing worldwide due to climate change and destructive agricultural practices. Excessive amounts of salt in soils cause imbalances in ion distribution, physiological dehydration, and oxidative stress in plants. Breeding and genetic engineering methods to improve plant salt tolerance and the better use of saline soils are being explored; however, these approaches can take decades to accomplish. A shorter-term approach to improve plant salt tolerance is to be inoculated with bacteria with high salt tolerance or adjusting the balance of bacteria in the rhizosphere, including endosymbiotic bacteria (living in roots or forming a symbiont) and exosymbiotic bacteria (living on roots). Rhizosphere bacteria promote plant growth and alleviate salt stress by providing minerals (such as nitrogen, phosphate, and potassium) and hormones (including auxin, cytokinin, and abscisic acid) or by reducing ethylene production. Plant growth-promoting rhizosphere bacteria are a promising tool to restore agricultural lands and improve plant growth in saline soils. In this review, we summarize the mechanisms of plant growth-promoting bacteria under salt stress and their applications for improving plant salt tolerance to provide a theoretical basis for further use in agricultural systems.

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Section: Methods To Improve Symbiont Bacteria Utilizationmentioning

confidence: 99%

Progress and Applications of Plant Growth-Promoting Bacteria in Salt Tolerance of Crops

Gao

Zou

Wang

et al. 2022

IJMS

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“…The habitat of Bradyrhizobium is typically the rhizosphere but also forest soils [ 43 , 44 ]. Members of the genus Pseudomonas occur, e.g., in soils and the rhizosphere [ 39 , 45 ] or as endophytes [ 45 ]. Variovorax is common in the rhizosphere among several other environments [ 46 ].…”

Section: Taxonomic and Ecological Distributionmentioning

confidence: 99%

“…In the Firmicutes, most of the Oxds were found in Bacillus , Brevibacillus and the related genus Siminovitchia , while some other genera contain a single Oxd. Bacilli have a number of different habitats including the rhizosphere and also include endophytic bacteria [ 45 ].…”

Section: Taxonomic and Ecological Distributionmentioning

confidence: 99%

Metabolism of Aldoximes and Nitriles in Plant-Associated Bacteria and Its Potential in Plant-Bacteria Interactions

et al. 2022

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In plants, aldoximes per se act as defense compounds and are precursors of complex defense compounds such as cyanogenic glucosides and glucosinolates. Bacteria rarely produce aldoximes, but some are able to transform them by aldoxime dehydratase (Oxd), followed by nitrilase (NLase) or nitrile hydratase (NHase) catalyzed transformations. Oxds are often encoded together with NLases or NHases in a single operon, forming the aldoxime–nitrile pathway. Previous reviews have largely focused on the use of Oxds and NLases or NHases in organic synthesis. In contrast, the focus of this review is on the contribution of these enzymes to plant-bacteria interactions. Therefore, we summarize the substrate specificities of the enzymes for plant compounds. We also analyze the taxonomic and ecological distribution of the enzymes. In addition, we discuss their importance in selected plant symbionts. The data show that Oxds, NLases, and NHases are abundant in Actinobacteria and Proteobacteria. The enzymes seem to be important for breaking through plant defenses and utilizing oximes or nitriles as nutrients. They may also contribute, e.g., to the synthesis of the phytohormone indole-3-acetic acid. We conclude that the bacterial and plant metabolism of aldoximes and nitriles may interfere in several ways. However, further in vitro and in vivo studies are needed to better understand this underexplored aspect of plant–bacteria interactions.

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“…Many species of microorganisms dwelling in the rhizosphere of plants form symbioses with plants whom they supply with mobilized nutrients, as well as organic exometabolites with hormone-like properties [93,94]. Thus, the K-solubilizing microbes, including the bacteria (Bacillus mucilaginosus, B. edaphicus, B. circulans, Acidithiobacillus ferrooxidans, and Paenibacillus spp.)…”

Section: The Application Of Microbial Cultures For Soil K Mobilizationmentioning

confidence: 99%

Essential Role of Potassium in Apple and Its Implications for Management of Orchard Fertilization

Кузин

Solovchenko

2021

Plants

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K (K) is of paramount importance for apple (Malus × domestica Borkh.), not only for tree growth and development but also for the size and quality of fruit yield. The apple plant’s demand for K varies, along with the progression of phenological phases, during the growing season. The K demand peaks during ripening of fruits featuring relatively high concentration of K comparable to that of the leaves. The mainstream method of apple tree K fertilization is through application of the fertilizer to the soils to improve K uptake by the roots. The bioavailability of K depends on assorted various factors, including pH, interaction with other nutrients in soil solution, temperature, and humidity. An important role in making the K from soil available for uptake by plants is played by plant growth-promoting microorganisms (PGPM), and the specific role of the PGPM is discussed. Advantages of fertigation (the combination of irrigation and fertilization) as an approach include allowing to balance application rate of K fertilizer against its variable demand by plants during the growing season. Excess K in the soil leads to competitive inhibition of calcium uptake by plants. The K-dependent deficiency of Ca leads to its predominant channeling to the leaves and hence to its decline in fruits. Consequently, the apple fruits affected by the K/Ca imbalance frequently develop physiological disorders in storage. This emphasizes the importance of the balanced K application, especially during the last months of the growing season, depending on the crop load and the actual K demand. The potential use of modern approaches to automated crop load estimation through machine vision for adjustment of K fertilization is underlined.

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Plant growth-promoting root-colonizing bacterial endophytes

Cited by 70 publications

References 141 publications

Progress and Applications of Plant Growth-Promoting Bacteria in Salt Tolerance of Crops

Progress and Applications of Plant Growth-Promoting Bacteria in Salt Tolerance of Crops

Metabolism of Aldoximes and Nitriles in Plant-Associated Bacteria and Its Potential in Plant-Bacteria Interactions

Essential Role of Potassium in Apple and Its Implications for Management of Orchard Fertilization

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