| Title | Streptomyces sp. strain SK68, isolated from peanut rhizosphere, promotes growth and alleviates salt stress in tomato (Solanum lycopersicum cv. Micro-Tom) |
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| Author | Karthiyaini Damodharan1, Sasikumar Arunachalam Palaniyandi2, Bao Le3, Joo-Won Suh1*, and Seung Hwan Yang3* |
| Address | 1Center for Nutraceutical and Pharmaceutical Materials, College of Natural Science, Myongji University, Yongin 17058, Republic of Korea, 2Department of Biotechnology, Mepco Schlenk Engineering College, Mepco Nagar, Mepco Engineering College Post-626005, Sivakasi, Tamilnadu, India, 3Department of Biotechnology, Chonnam National University, Yeosu 59626, Republic of Korea |
| Bibliography | Journal of Microbiology, 56(10),753–759, 2018, |
| DOI | 10.1007/s12275-018-8120-5 |
| Key Words | plant growth promotion, Streptomyces, salt-stress, tomato |
| Abstract | A novel actinobacterium, strain SK68, was isolated from the rhizosphere of peanut plant and its salinity stress alleviation ability was studied using tomato (Solanum lycopersicum cv. Micro-Tom) plants. Based on 16S rDNA based phylogenetic analysis, strain SK68 has been identified as a Streptomyces sp. Strain SK68 had branched substrate mycelium bearing smooth surfaced spores and the spore colour is brownish grey on ISP4 medium. It exhibited enzyme activities such as xylanase, cellulase, amylase, and pectinase and degraded hypoxanthine, casein, and L-tyrosine. The strain SK68 differed in its banding pattern in BOX-PCR and RAPD fingerprinting compared to the closely matching type strains Streptomyces erythrochromogenes NBRC 3304T (AB184746), S. flavotricini NBRC 12770T (AB184132), S. racemochromogenes NBRC 12906T (AB184235), and S. polychromogenes NBRC 13072T (NR041109). Strain SK68 was evaluated for its salinity stress-alleviating activity in tomato plants with 180 mmol/L NaCl under gnotobiotic condition. A significant increase in plant biomass was observed in strain SK68-inoculated tomato plants under salt stress compared to control and salt-stressed non-inoculated plants. |