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Original Research Articles                      Volume : 15, Issue:3, March, 2026

PRINT ISSN : 2319-7692
Online ISSN : 2319-7706
Issues : 12 per year
Publisher : Excellent Publishers
Email : editorijcmas@gmail.com /
submit@ijcmas.com
Editor-in-chief: Dr.M.Prakash
Index Copernicus ICV 2018: 95.39
NAAS RATING 2020: 5.38

Int.J.Curr.Microbiol.App.Sci.2026.15(3): 163-182
DOI: https://doi.org/10.20546/ijcmas.2026.1503.016


Identification and Characterization of Actinobacteria from Rice-Rhizosphere for Salt Stress Tolerance and Plant Growth Promotion
T. Kavya1, Venkadasamy Govindasamy1*, Gerard Abraham2, T. Vinutha3, Aundy Kumar4 and Archna Suman1
1Division of Microbiology, ICAR-Indian Agricultural Research Institute, New Delhi -110 012, India 2Centre for Conservation and Utilization of Blue Green Algae (CCUBGA), ICAR-Indian Agricultural Research Institute, New Delhi -110 012, India 3Division of Biochemistry, ICAR-Indian Agricultural Research Institute, New Delhi -110 012, India 4Division of Pathology, ICAR-Indian Agricultural Research Institute, New Delhi -110 012, India
*Corresponding author
Abstract:

In this present study, 27 rice-rhizosphere actinobacterial isolates were screened for salt (NaCl) stress tolerance and plant growth-promoting (PGP) traits. Significant growth was observed in 24, 12, and three isolates at 7.5%, 10%, and 12.5% NaCl, respectively. Quantitative screening revealed nitrogen fixation in 13 isolates (0.65±0.04 to 28.68±0.58 µmoles ethylene/hr), phosphorus solubilization in six isolates, and siderophore, HCN, and exopolysaccharide production in 20, 25, and 16 isolates, respectively. The phytohormone, auxins (IAA) production was varied from 96.05±0.03 to 4.72±0.05 µg/ml and 90.58±0.02 to 7.52±0.01 µg/ml in the presence (19 isolates) and absence (20 isolates) of precursor L-tryptophan, respectively. Among the 18 actinobacterial isolates identified, ACC deaminase enzyme activity was reported in terms of ACC consumption in the range of 2.41±1.56 to 3.07±0.97 mmol. Among the 27-actinobactreial isolates, molecular identification of 8 isolates revealed them they are belonging to different species of actinobacterial genus Streptomyces. Based on the results of NaCl tolerance and PGP traits screening, three rice-rhizosphere actinobacterial isolates were selected as promising salt stress tolerant and possessing multiple-PGP traits, which were phylogenetically identified as Kitasatospora sp. strain Met24, Streptomyces tritolerans strain V04a and Streptomyces sp. strain Humic 11a. The halotolerant rice-rhizosphere actinobacteria identified and characterized in this study could be a promising candidate for utilization as growth stimulating bioinoculants subject to their further evaluation/investigations in the rice crop under salt stress conditions.


Keywords: Actinobacteria; Streptomyces spp.; PGPRs; Rice (Oryza sativa L.); Salt stress tolerance


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Kavya T., Venkadasamy Govindasamy, Gerard Abraham, Vinutha T., Aundy Kumar and Archna Suman. 2026. Identification and Characterization of Actinobacteria from Rice-Rhizosphere for Salt Stress Tolerance and Plant Growth Promotion.Int.J.Curr.Microbiol.App.Sci. 15(3): 163-182. doi: https://doi.org/10.20546/ijcmas.2026.1503.016
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