Plant Growth-Promoting Rhizobacteria: Key Mechanisms of Action

Figueiredo, Márcia do Vale Barreto; Bonifácio, Aurenívia; Rodrigues, Artenisa Cerqueira; Araújo, Fábio Fernando de

doi:10.1007/978-981-10-0388-2_3

Cited by 35 publications

(18 citation statements)

References 101 publications

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“…Some bacteria belonging to the genera Azotobacter, Bacillus, Klebsiella, Pseudomonas, Azospirillum, and Serratia are beneficial microorganisms recognized as plant growth-promoting rhizobacteria (PGPR) (Figueiredo et al 2016;Parray et al 2016). PGPR are microbes that promote beneficial effects on plant development through direct or indirect mechanisms (Ngumbi and Kloepper 2016;Enebe and Babalola 2018).…”

Section: Introductionmentioning

confidence: 99%

Bacillus subtilis ameliorates water stress tolerance in maize and common bean

Lima

Moro

Pacheco

et al. 2019

Journal of Plant Interactions

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Water stress is one important abiotic stress with negative impacts on plant productivity. In order to ameliorate abiotic stress, plant growth-promoting rhizobacteria (PGPR), such as Bacillus subtilis, can be used due to their positive effects on plant physiology. The present study aimed to evaluate the effects of B. subtilis on the performance of maize and common bean under water deficit conditions. The study was performed in a plant growth chamber and the growth, gas exchange parameters and antioxidant activity were evaluated. B. subtilis promoted the growth of common bean and maize, and also increased the water use efficiency. The inoculation with B. subtilis increased leaf water content and the regulation of stomata, without damaging photosynthetic rates. Overall, B. subtilis decreased antioxidant activities in both plants. The results suggest that B. subtilis could be used as inoculants for common bean and maize to protect against water stress. ARTICLE HISTORY

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Section: Introductionmentioning

confidence: 99%

Bacillus subtilis ameliorates water stress tolerance in maize and common bean

Lima

Moro

Pacheco

et al. 2019

Journal of Plant Interactions

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“…6 BNF is an important process by which nitrogen is supplied to plants via nitrogen-fixing bacteria (also called rhizobia). 7 Cowpea plants establish symbiotic relationships with rhizobia, which form root nodules where BNF occurs. The root nodules can provide approximately 200 kg ha −1 of nitrogen to cowpea plants under optimal conditions and cause a positive soil nitrogen balance up to 92 kg ha −1 .…”

Section: Introductionmentioning

confidence: 99%

“…Salinity-induced ROS formation causes oxidative damage to lipids, proteins and other cellular components. 7 , 8 , 11 To cope with this situation, plants have developed mechanisms to survive under high-salinity conditions with an emphasis on ionic compartmentalization, synthesis of compatible solutes, and recruitment of antioxidative enzymes and compounds that neutralize and detoxify ROS. 4 , 6 , 11 Superoxide dismutase (SOD), catalase (CAT) and phenol peroxidase (POX) are antioxidative enzymes that are directly involved in defense mechanisms against ROS.…”

Section: Introductionmentioning

confidence: 99%

Antioxidant response of cowpea co-inoculated with plant growth-promoting bacteria under salt stress

Santos

Silveira

Bonifácio

et al. 2018

Brazilian Journal of Microbiology

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Soil salinity is an important abiotic stress worldwide, and salt-induced oxidative stress can have detrimental effects on the biological nitrogen fixation. We hypothesized that co-inoculation of cowpea plants with Bradyrhizobium and plant growth-promoting bacteria would minimize the deleterious effects of salt stress via the induction of enzymatic and non-enzymatic antioxidative protection. To test our hypothesis, cowpea seeds were inoculated with Bradyrhizobium or co-inoculated with Bradyrhizobium and plant growth-promoting bacteria and then submitted to salt stress. Afterward, the cowpea nodules were collected, and the levels of hydrogen peroxide; lipid peroxidation; total, reduced and oxidized forms of ascorbate and glutathione; and superoxide dismutase, catalase and phenol peroxidase activities were evaluated. The sodium and potassium ion concentrations were measured in shoot samples. Cowpea plants did not present significant differences in sodium and potassium levels when grown under non-saline conditions, but sodium content was strongly increased under salt stress conditions. Under non-saline and salt stress conditions, plants co-inoculated with Bradyrhizobium and Actinomadura or co-inoculated with Bradyrhizobium and Paenibacillus graminis showed lower hydrogen peroxide content in their nodules, whereas lipid peroxidation was increased by 31% in plants that were subjected to salt stress. Furthermore, cowpea nodules co-inoculated with Bradyrhizobium and plant growth-promoting bacteria and exposed to salt stress displayed significant alterations in the total, reduced and oxidized forms of ascorbate and glutathione. Inoculation with Bradyrhizobium and plant growth-promoting bacteria induced increased superoxide dismutase, catalase and phenol peroxidase activities in the nodules of cowpea plants exposed to salt stress. The catalase activity in plants co-inoculated with Bradyrhizobium and Streptomyces was 55% greater than in plants inoculated with Bradyrhizobium alone, and this value was remarkably greater than that in the other treatments. These results reinforce the beneficial effects of plant growth-promoting bacteria on the antioxidant system that detoxifies reactive oxygen species. We concluded that the combination of Bradyrhizobium and plant growth-promoting bacteria induces positive responses for coping with salt-induced oxidative stress in cowpea nodules, mainly in plants co-inoculated with Bradyrhizobium and P. graminis or co-inoculated with Bradyrhizobium and Bacillus.

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“…Plant growth-promoting rhizobacteria (PGPR) include a small bacterial community that colonizes the rhizosphere, from which they exert positive effects on plant growth and health ( Barriuso et al, 2008 ). PGPR may promote growth directly through indole-3-acetic acid (IAA) secretion, phosphorus dissolution, and siderophore production ( Olanrewaju et al, 2017 ) and indirectly through increased tolerance to environmental stress, plague and phytopathogen control, and induced systemic resistance ( Abbey et al, 2019 , Figuereido et al, 2016 , Enebe and Babalola, 2019 ).…”

Section: Introductionmentioning

confidence: 99%

Bacillus strain selection with plant growth-promoting mechanisms as potential elicitors of systemic resistance to gray mold in pepper plants

Gutiérrez

Blanco

Aranguren

2020

Saudi Journal of Biological Sciences

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Highlights Bacillus licheniformis induced resistance against gray mold in pepper plants. Bacillus licheniformis and Bacillus pumilus inhibited the growth of Botrytis cinerea and Fusarium solani. Plant growth promoting mechanisms were confirmed by isolated Bacillus strains.

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Plant Growth-Promoting Rhizobacteria: Key Mechanisms of Action

Cited by 35 publications

References 101 publications

Bacillus subtilis ameliorates water stress tolerance in maize and common bean

Bacillus subtilis ameliorates water stress tolerance in maize and common bean

Antioxidant response of cowpea co-inoculated with plant growth-promoting bacteria under salt stress

Bacillus strain selection with plant growth-promoting mechanisms as potential elicitors of systemic resistance to gray mold in pepper plants

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