Induced resistance and plant growth promotion by endophytic bacteria Bacillus sp. AA2 against Meloidogyne sp. on pepper

Colonization of a biofertilizer Bacillus sp. OYK strain, which was isolated from a soil, was compared with three rhizospheric and endophytic Bacillus sp. strains to evaluate the colonization potential of the Bacillus sp. strains with a different origin. Surface-sterilized seeds of tomato (Solanum lycopersicum L. cv. Chika) were sown in the sterilized vermiculite, and four Bacillus sp. strains were each inoculated onto the seed zone. After cultivation in a phytotron, plant growth parameters and populations of the inoculants in the root, shoot, and rhizosphere were determined. In addition, effects of co-inoculation and time interval inoculation of Bacillus sp. F-33 with the other endophytes were examined. All Bacillus sp. strains promoted plant growth except for Bacillus sp. RF-37, and populations of the rhizospheric and endophytic Bacillus sp. strains were 1.4–2.8 orders higher in the tomato plant than that of Bacillus sp. OYK. The plant growth promotion by Bacillus sp. F-33 was reduced by co-inoculation with the other endophytic strains: Klebsiella sp. Sal 1, Enterobacter sp. Sal 3, and Herbaspirillum sp. Sal 6., though the population of Bacillus sp. F-33 maintained or slightly decreased. When Klebsiella sp. Sal 1 was inoculated after Bacillus sp. F-33, the plant growth-promoting effects by Bacillus sp. F-33 were reduced without a reduction of its population, while when Bacillus sp. F-33 was inoculated after Klebsiella sp. Sal 1, the effects were increased in spite of the reduction of its population. Klebsiella sp. Sal 1 colonized dominantly under both conditions. The higher population of rhizospheric and endophytic Bacillus sp. in the plant suggests the importance of the origin of the strains for their colonization. The plant growth promotion and colonization potentials were independently affected by the co-existing microorganisms.

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Isolation of phosphate solubilizing endophytic bacteria from Phyllanthus amarus Schum & Thonn: Evaluation of plant growth promotion and antioxidant activity under salt stress

Journal of Applied Research on Medicinal and Aromatic Plants ◽

10.1016/j.jarmap.2016.02.003 ◽

2016 ◽

Vol 3 (2) ◽

pp. 71-77 ◽

Cited By ~ 17

Author(s):

Manoharan Melvin Joe ◽

Shalini Devaraj ◽

Abitha Benson ◽

Tongmin Sa

Keyword(s):

Antioxidant Activity ◽

Salt Stress ◽

Plant Growth ◽

Plant Growth Promotion ◽

Endophytic Bacteria ◽

Growth Promotion ◽

Phyllanthus Amarus ◽

Phosphate Solubilizing

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Interactions between putatively endophytic bacteria and tall fescue (Festuca arundinacea): plant growth promotion and colonization in host and non-host cultivars

Plant and Soil ◽

10.1007/s11104-019-04359-5 ◽

2019 ◽

Vol 451 (1-2) ◽

pp. 207-220

Author(s):

Patricia Vaz Jauri ◽

Cecilia Taulé ◽

Maria Cecilia de los Santos ◽

Belén Fernandez ◽

Andrés Di Paolo ◽

...

Keyword(s):

Plant Growth ◽

Plant Growth Promotion ◽

Tall Fescue ◽

Festuca Arundinacea ◽

Endophytic Bacteria ◽

Growth Promotion

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Characterization of bacterial endophytes from the roots of native and cultivated Brazil nut trees (Bertholletia excelsa)

Acta Amazonica ◽

10.1590/1809-4392201804831 ◽

2019 ◽

Vol 49 (4) ◽

pp. 257-267

Author(s):

Patrícia Bombonati CHALITA ◽

Eliane do Nascimento Cunha FARIAS ◽

Ismaele Breckenfeld da COSTA ◽

Brenda Ferreira SOUSA ◽

Marco Antônio Oliveira dos SANTOS ◽

...

Keyword(s):

Plant Growth ◽

Plant Growth Promotion ◽

Endophytic Bacteria ◽

Growth Promotion ◽

Nifh Gene ◽

Aluminum Phosphate ◽

Brazil Nut ◽

Indole Compounds ◽

Plant Growth Promoting ◽

Growth Promoting

ABSTRACT Brazil nut is a very important nontimber forest product in the Amazon region. Propagation of this tree still represents a challenge due to slow and uneven seed germination. In this context, plant growth-promoting bacteria can facilitate the process of propagation. The aims of this study were to isolate and characterize endophytic bacteria from the roots of Brazil nut trees in native terra firme forest and cultivation areas in northern Brazil, and to identify mechanisms by which bacteria act in plant growth promotion. Overall, 90 bacterial isolates were obtained from the roots of Brazil nut trees in monoculture, agroforestry and native forest areas by using different semisolid media. The isolates were characterized by sequencing the 16S rRNA gene. Plant growth-promoting characteristics were evaluated by the presence of the nifH gene, aluminum phosphate solubilization and the production of indole compounds. The isolates were affiliated with 18 genera belonging to 5 different classes (α-Proteobacteria, β-Proteobacteria, γ-Proteobacteria, Bacilli and Actinobacteria). The genus Bacillus was predominant in the forest and monoculture areas. Fourteen isolates presented the nifH gene. Most of the bacteria were able to solubilize aluminum phosphate and synthetize indole compounds. The results indicated high diversity of endophytic bacteria present among the roots of Brazil nut trees, mainly in the agroforestry area, which could be related to soil attributes. Among the 90 isolates, the 22 that presented the best results regarding plant growth promotion traits were good candidates for testing in seedling production of Brazil nut trees.

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