Plant-associated Bacillus modulates the expression of auxin-responsive genes of rice and modifies the root architecture

Ambreetha, Sakthivel; Chinnadurai, Chinnappan; Marimuthu, Ponnusamy; Balachandar, D.

doi:10.1016/j.rhisph.2017.12.001

Cited by 90 publications

(35 citation statements)

References 77 publications

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“…Recent studies demonstrated that Bacillus spp. play a major role in controlling endogenous IAA levels in plant roots by regulating the auxin-responsive genes, thereby causing changes in root architecture [ 117 ].…”

Section: Mechanisms Of Plant Growth Promotionmentioning

confidence: 99%

The Significance of Bacillus spp. in Disease Suppression and Growth Promotion of Field and Vegetable Crops

2020

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Bacillus spp. produce a variety of compounds involved in the biocontrol of plant pathogens and promotion of plant growth, which makes them potential candidates for most agricultural and biotechnological applications. Bacilli exhibit antagonistic activity by excreting extracellular metabolites such as antibiotics, cell wall hydrolases, and siderophores. Additionally, Bacillus spp. improve plant response to pathogen attack by triggering induced systemic resistance (ISR). Besides being the most promising biocontrol agents, Bacillus spp. promote plant growth via nitrogen fixation, phosphate solubilization, and phytohormone production. Antagonistic and plant growth-promoting strains of Bacillus spp. might be useful in formulating new preparations. Numerous studies of a wide range of plant species revealed a steady increase in the number of Bacillus spp. identified as potential biocontrol agents and plant growth promoters. Among different mechanisms of action, it remains unclear which individual or combined traits could be used as predictors in the selection of the best strains for crop productivity improvement. Due to numerous factors that influence the successful application of Bacillus spp., it is necessary to understand how different strains function in biological control and plant growth promotion, and distinctly define the factors that contribute to their more efficient use in the field.

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Section: Mechanisms Of Plant Growth Promotionmentioning

confidence: 99%

The Significance of Bacillus spp. in Disease Suppression and Growth Promotion of Field and Vegetable Crops

2020

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“…and B. cereus with ability to solubilize P, K and Zn and activities against Pyricularia oryzae and Fusarium oryzae have shown increased yield and zinc translocation towards grains in basmati rice varieties (Shakeel et al ). An IAA‐producing PGPR strain, B. altitudinis FD48, when inoculated to rice was shown to modify root architecture by regulating auxin‐responsive genes (Ambreetha et al ). Bacillus megaterium and B. safensis were reported to enhance plant growth parameters like root and shoot dry weight and seed weight under field condition in wheat (Mukhtar et al ).…”

Section: Bacillus and Plant Growth Promotion In Crop Plantsmentioning

confidence: 99%

Bacillusspecies in soil as a natural resource for plant health and nutrition

et al. 2019

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The genus Bacillus is one of the predominant bacterial genera found in soil, and several species of this genus have been reported from diverse ecological niches. Endowed with tremendous genetic and metabolic diversity, Bacillus spp. serve multiple ecological functions in soil ecosystem from nutrient cycling to conferring stress tolerance to plants. Members of the genus Bacillus are known to have multiple beneficial traits which help the plants directly or indirectly through acquisition of nutrients, overall improvement in growth by production of phytohormones, protection from pathogens and other abiotic stressors. This functionally versatile genus is one of the most commercially exploited bacteria in the agro-biotechnology industry. Still its potential has not been realized sufficiently and requires an emphasis towards translating the relevant technologies from laboratory to land for the benefit of mankind.

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“…Nevertheless, significant correlations between in vitro bacterial traits and the respective inoculation response are commonly reported in the literature, including those used to suggest which mechanism of growth-promoting is predominant in plant-bacterium associations [82][83][84]. From the set of direct mechanisms that PGPB can use to enhance plant growth, the biosynthesis of phytohormones such as IAA has been reported to play a major role due to its effects on root architecture and, consequently, on the acquisition of water and nutrients by plants [82,[85][86][87]. The ability to solubilize P forms has recently been raised as a target trait for bacterial inoculants because, in most soils, the soluble P amount is low and because phosphates are a nonrenewable mineral resource needed for plant nutrition [88,89].…”

Section: In Vitro Assays In Vivo Assays: Tomatomentioning

confidence: 99%

Diversity and plant growth-promoting functions of diazotrophic/N-scavenging bacteria isolated from the soils and rhizospheres of two species of Solanum

et al. 2020

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Studies of the interactions between plants and their microbiome have been conducted worldwide in the search for growth-promoting representative strains for use as biological inputs for agriculture, aiming to achieve more sustainable agriculture practices. With a focus on the isolation of plant growth-promoting (PGP) bacteria with ability to alleviate N stress, representative strains that were found at population densities greater than 10 4 cells g -1 and that could grow in N-free semisolid media were isolated from soils under different management conditions and from the roots of tomato (Solanum lycopersicum) and lulo (Solanum quitoense) plants that were grown in those soils. A total of 101 bacterial strains were obtained, after which they were phylogenetically categorized and characterized for their basic PGP mechanisms. All strains belonged to the Proteobacteria phylum in the classes Alphaproteobacteria (61% of isolates), Betaproteobacteria (19% of isolates) and Gammaproteobacteria (20% of isolates), with distribution encompassing nine genera, with the predominant genus being Rhizobium (58.4% of isolates). Strains isolated from conventional horticulture (CH) soil composed three bacterial genera, suggesting a lower diversity for the diazotrophs/N scavenger bacterial community than that observed for soils under organic management (ORG) or secondary forest coverture (SF). Conversely, diazotrophs/N scavenger strains from tomato plants grown in CH soil comprised a higher number of bacterial genera than did strains isolated from tomato plants grown in ORG or SF soils. Furthermore, strains isolated from tomato were phylogenetically more diverse than those from lulo. BOX-PCR fingerprinting of all strains revealed a high genetic diversity for several clonal representatives (four Rhizobium species and one Pseudomonas species). Considering the potential PGP mechanisms, 49 strains (48.5% of the total) produced IAA (2.96-193.97 μg IAA mg protein -1 ), 72 strains (71.3%) solubilized FePO 4 (0.40-56.00 mg l -1 ), 44 strains (43.5%) solubilized AlPO 4 (0.62-17.05 mg l -1 ), and 44 strains produced siderophores (1.06-3.23). Further, 91 isolates (90.1% of total) showed at least one PGP trait, and 68 isolates (67.3%) showed multiple PGP traits. Greenhouse trials using the bacterial collection to inoculate tomato or lulo plants revealed increases in plant biomass (roots, shoots or both plant PLOS ONE | https://doi.org/10.

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Plant-associated Bacillus modulates the expression of auxin-responsive genes of rice and modifies the root architecture

Cited by 90 publications

References 77 publications

The Significance of Bacillus spp. in Disease Suppression and Growth Promotion of Field and Vegetable Crops

The Significance of Bacillus spp. in Disease Suppression and Growth Promotion of Field and Vegetable Crops

Bacillusspecies in soil as a natural resource for plant health and nutrition

Diversity and plant growth-promoting functions of diazotrophic/N-scavenging bacteria isolated from the soils and rhizospheres of two species of Solanum

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