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Eucalyptus growth promotion by endophytic Bacillus spp.

I C P Paz¹, R C M Santin, A M Guimarães

¹Laboratório de Microbiologia Fitopatógica, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brasil. isapaz@gmail.com

Genetics and Molecular Research : GMR

|August 30, 2012

Summary

Endophytic bacteria were isolated from eucalyptus to improve plant growth. Bacillus sp strain EUCB 10 significantly enhanced root and aerial development in E. urograndis plantlets.

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Area of Science:

Microbiology
Plant Science
Forestry

Background:

Clonal eucalyptus propagation faces challenges due to poor root and shoot development in some high-yield clones.
Endophytic microorganisms reside within plants and can promote growth without causing harm.
Identifying beneficial endophytes offers a sustainable approach to enhance eucalyptus cultivation.

Purpose of the Study:

To isolate and identify endophytic bacteria from Eucalyptus.
To evaluate the plant growth-promoting potential of these isolates on E. urograndis clone 4622.
To assess the indole acetic acid production, nitrogen fixation, and phosphate solubilization capabilities of the isolates.

Main Methods:

Isolation of endophytic bacteria from healthy eucalyptus plants.
Greenhouse testing of 18 bacterial isolates for plant growth promotion on E. urograndis.
Biochemical assays for indole acetic acid production, nitrogen fixation, and phosphate solubilization.
Identification of isolates using partial 16S rRNA gene sequencing.

Main Results:

Bacillus subtilis was the most frequently identified species among the isolates.
Several Bacillus species, including B. licheniformis and B. subtilis, were identified as novel eucalyptus endophytes.
Bacillus sp strain EUCB 10 demonstrated a significant increase in both root and aerial part growth of eucalyptus plantlets under greenhouse conditions across different seasons.

Conclusions:

Endophytic bacteria, particularly Bacillus species, hold significant potential for promoting the growth of E. urograndis.
Bacillus sp strain EUCB 10 is a promising candidate for improving vegetative propagation and overall growth in clonal eucalyptus.
This study highlights the importance of exploring endophytic microbial communities for sustainable agricultural and forestry practices.