Streptomyces sp. strain SK68, isolated from peanut rhizosphere, promotes growth and alleviates salt stress in tomato (Solanum lycopersicum cv. Micro-Tom).
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.
['Damodharan|Karthiyaini|K|', 'Palaniyandi|Sasikumar Arunachalam|SA|', 'Le|Bao|B|', 'Suh|Joo-Won|JW|', 'Yang|Seung Hwan|SH|']
D010367:Arachis D018533:Biomass D004269:DNA, Bacterial D018551:Lycopersicon esculentum D010802:Phylogeny D012336:RNA, Ribosomal, 16S D058441:Rhizosphere D054712:Salinity D012988:Soil Microbiology D013302:Streptomyces D013312:Stress, Physiological
Streptomyces tomato salt-stress growth promotion