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VOL. 11, ISSUE 2 (2026)
Intrinsic antibiotic resistance profiles of root nodule endophytes isolated from Albizia lebbeck
Authors
Aanchal Mishra, Indu Singh Sankhla, Alkesh Tak
Abstract
Intrinsic antibiotic resistance (IAR) is a useful
phenotypic marker for the characterization, identification and ecological
monitoring of rhizobial and endophytic bacterial strains. In the present study,
the IAR patterns of 21 endophytic bacterial strains isolated from the root
nodules of the tropical legume Albizia lebbeck (L.) Benth was evaluated.
The isolates were tested against seven antibiotics using the disk diffusion
method. The results revealed distinct and diverse resistance profiles among the
isolates. All strains demonstrated high sensitivity to neomycin, streptomycin (except
for three strains) and tetracycline. A high frequency of resistance was
observed against erythromycin (57%), ciprofloxacin (29%), and gentamicin (29%).
The combined IAR patterns allowed for the clear differentiation of the 21
isolates into multiple phenotypic clusters. The observed resistance profiles
align with the typical IAR patterns reported for slow-growing Bradyrhizobia.
This study confirms that IAR profiling may be used as a rapid, reliable and
cost-effective method for phenotyping characterization.
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Pages:157-160
How to cite this article:
Aanchal Mishra, Indu Singh Sankhla, Alkesh Tak "Intrinsic antibiotic resistance profiles of root nodule endophytes isolated from <i>Albizia</i> <i>lebbeck</i>". International Journal of Botany Studies, Vol 11, Issue 2, 2026, Pages 157-160
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