Hydrolytic Enzyme Producing Plant Growth-Promoting Rhizobacteria (PGPR) in Plant Growth Promotion and Biocontrol

Reddy, Eddula Chengal; Reddy, Gari Surendranatha; Goudar, Vedavati; Sriramula, Arava; Swarnalatha, G.; Tawaha, Abdel Rahman Mohammad Al; Sayyed, R. Z.

doi:10.1007/978-3-031-07559-9_15

Cited by 13 publications

(5 citation statements)

References 25 publications

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“…Hydrolytic enzymes play a pivotal role in the decomposition of dead organic matter present in the soil and provide nutrients to plants ( Reetha et al, 2014 ). Recently, Reddy et al (2022) reported PGPB have the ability to produce hydrolytic enzymes. Bhutani et al (2021) also isolated cellulase and pectinase producing bacteria from the mungbean endosphere, which showed plant growth-promoting (PGP) potential.…”

Section: Resultsmentioning

confidence: 99%

Probing the potential of salinity-tolerant endophytic bacteria to improve the growth of mungbean [Vigna radiata (L.) Wilczek]

Zahra,

Tariq,

Abdullah

et al. 2023

Front. Microbiol.

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Soil salinity is one of the major limiting factors in plant growth regulation. Salinity-tolerant endophytic bacteria (STEB) can be used to alleviate the negative effects of salinity and promote plant growth. In this study, thirteen endophytic bacteria were isolated from mungbean roots and tested for NaCl salt-tolerance up to 4%. Six bacterial isolates, TMB2, TMB3, TMB5, TMB6, TMB7 and TMB9, demonstrated the ability to tolerate salt. Plant growth-promoting properties such as phosphate solubilization, indole-3-acetic acid (IAA) production, nitrogen fixation, zinc solubilization, biofilm formation and hydrolytic enzyme production were tested in vitro under saline conditions. Eight bacterial isolates indicated phosphate solubilization potential ranging from 5.8–17.7 μg mL−1, wherein TMB6 was found most efficient. Ten bacterial isolates exhibited IAA production ranging from 0.3–2.1 μg mL−1, where TMB7 indicated the highest potential. All the bacterial isolates except TMB13 exhibited nitrogenase activity. Three isolates, TMB6, TMB7 and TMB9, were able to solubilize zinc on tris-minimal media. All isolates were capable of forming biofilm except TMB12 and TMB13. Only TMB2, TMB6 and TMB7 exhibited cellulase activity, while TMB2 and TMB7 exhibited pectinase production. Based on in vitro testing, six efficient STEB were selected and subjected to the further studies. 16S rRNA gene sequencing of efficient STEB revealed the maximum similarity between TMB2 and Rhizobium pusense, TMB3 and Agrobacterium leguminum, TMB5 and Achromobacter denitrificans, TMB6 and Pseudomonas extremorientalis, TMB7 and Bradyrhizobium japonicum and TMB9 and Serratia quinivorans. This is the first international report on the existence of A. leguminum, A. denitrificans, P. extremorientalis and S. quinivorans inside the roots of mungbean. Under controlled-conditions, inoculation of P. extremorientalis TMB6, B. japonicum TMB7 and S. quinivorans TMB9 exhibited maximum potential to increase plant growth parameters; specifically plant dry weight was increased by up to 52%, 61% and 45%, respectively. Inoculation of B. japonicum TMB7 displayed the highest potential to increase plant proline, glycine betaine and total soluble proteins contents by 77%, 78% and 64%, respectively, compared to control under saline conditions. It is suggested that the efficient STEB could be used as biofertilizers for mungbean crop productivity under saline conditions after field-testing.

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Section: Resultsmentioning

confidence: 99%

Probing the potential of salinity-tolerant endophytic bacteria to improve the growth of mungbean [Vigna radiata (L.) Wilczek]

Zahra,

Tariq,

Abdullah

et al. 2023

Front. Microbiol.

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“…Reports of rhizobacterially produced enzymes controlling phytopathogens include F. oxysporum, Pyricularia oryzae, R. solani, Aspergillus niger, F. solani, Schizophyllum commune, Macrophomina phaseolina and F. graminearum [80,83,99,141,201,232]. Several recent reviews also cover this subject well [233][234][235].…”

Section: Antibiotic Enzyme Productionmentioning

confidence: 99%

“…Examples where PGPR control fungal pathogens by secretion of glucanases include R. solani [239] and S. sclerotiorum [239][240][241]. There are also examples of sugarcane derived PGPR Bacillus secreting glucanases into the rhizosphere to control R. solani, F. oxysporum and Fusarium moniliforme [242,243]. The involvement of microbe derived hydrolytic enzymes in plant pathogen control has been reviewed recently [229].…”

Section: Antibiotic Enzyme Productionmentioning

confidence: 99%

Rhizobacterial Control of Root Diseases and Stimulation of Plant Growth

Gutierrez-Urrego,

Johnston-Monje

2024

Preprint

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Plant growth promoting rhizobacteria (PGPR) are a diverse group of microorganisms including genera such as Pseudomonas, Bacillus, Serratia, Enterobacter and Klebsiella. These bacteria have the ability to colonize roots externally and internally, and to directly enhance plant growth employing various mechanisms like phytohormone production and nutrient mineralization. These microbes can also promote plant growth indirectly by secreting antimicrobial compounds (e.g., siderophores, hydrogen cyanide) to antagonize root pathogens or by inducing defensive responses in the plant. Interestingly, there are also cases where production of antibiotic compounds such as 2,4-Diacetylphloroglucinol have the direct effect of enhancing plant growth and yield, irrespective of their biocontrol effects. The objective of this paper is to review publications showcasing PGPRs that have the capacity to both control root pathogens and stimulate plant growth, and to discuss what mechanisms might be involved.

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“…The transition to organic farming, particularly the use of bio-fertilizers, has provided an environmentally friendly alternative to chemical-based farming, as well as improving crop yields and soil quality (Elnahal et al 2022 ). Both the rhizosphere and the inner regions of plant tissues serve as a special hub for their respective microbial communities, the rhizomicrobiome, and endophytomicrobiome are a rich source of plant probiotics due to the many traits they possess, such as the production of the plant hormones IAA (Nazli et al 2020 ), and lytic enzymes (Reddy et al 2022 ). Plant probiotics enhance nutrient absorption and provide protection to plants from environmental stresses, such as biotic and abiotic stresses, as well as improve plant health (Pandey et al 2022 ).…”

Section: Introductionmentioning

confidence: 99%

In vivo application of potent probiotics for enhancing potato growth and controlling Ralstonia solanacearum and Fusarium oxysporum infections

Abdel-Moghies,

El-Sehrawy,

Zakaria

et al. 2024

Antonie van Leeuwenhoek

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Plant probiotics are live microbial cells or cultures that support plant growth and control plant pathogens through different mechanisms. They have various effects on plants, including plant growth promotion through the production of indole acetic acid (IAA), biological control activity (BCA), and production of cellulase enzymes, thus inducing systemic resistance and increasing the availability of mineral elements. The present work aimed to study the potential of Achromobacter marplatensis and Bacillus velezensis as plant probiotics for the field cultivation of potatoes. In vitro studies have demonstrated the ability of selected probiotics to produce IAA and cellulase, as well as antimicrobial activity against two plant pathogens that infect Solanum tuberosum as Fusarium oxysporum and Ralstonia solanacearum under different conditions at a broad range of different temperatures and pH values. In vivo study of the effects of the probiotics A. marplatensis and B. velezensis on S. tuberosum plants grown in sandy clay loamy soil was detected after cultivation for 90 days. Probiotic isolates A. marplatensis and B. velezensis were able to tolerate ultraviolet radiation (UV) exposure for up to two hours, the dose response curve exhibited that the D10 values of A. marplatensis and B. velezensis were 28 and 16 respectively. In the case of loading both probiotics with broth, the shoot dry weight was increased significantly from 28 in the control to 50 g, shoot length increased from 24 to 45.7 cm, branches numbers increased from 40 to 70 branch, leaves number increased from 99 to 130 leaf, root dry weight increased from 9.3 to 12.9 g, root length increased from 24 to 35.7 cm, tuber weight increased from 15 to 37.0 g and tubers number increased from 9 to 24.4 tuber, the rot percentage was reduced to 0%. The addition of both probiotic isolates, either broth or wheat grains load separately has enhanced all the growth parameters; however, better results and increased production were in favor of adding probiotics with broth more than wheat. On the other hand, both probiotics showed a remarkable protective effect against potato pathogens separately and reduced the negative impact of the infection using them together.

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Hydrolytic Enzyme Producing Plant Growth-Promoting Rhizobacteria (PGPR) in Plant Growth Promotion and Biocontrol

Cited by 13 publications

References 25 publications

Probing the potential of salinity-tolerant endophytic bacteria to improve the growth of mungbean [Vigna radiata (L.) Wilczek]

Probing the potential of salinity-tolerant endophytic bacteria to improve the growth of mungbean [Vigna radiata (L.) Wilczek]

Rhizobacterial Control of Root Diseases and Stimulation of Plant Growth

In vivo application of potent probiotics for enhancing potato growth and controlling Ralstonia solanacearum and Fusarium oxysporum infections

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