National Academy of Agricultural Sciences (NAAS)
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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 |
Cold-tolerant PGPRs are known to improve plant growth and nutrient uptake by an array of mechanisms, under stress and nutrient imbalance conditions. On the basis of growth potential we selected 43 PGPRs from pool of 85 rhizobacterial isolates obtained from wheat rhizospheric soil collected from different wheat growing fields. Phosphate and zinc solubilization efficiency along with phytohormones and siderophore producing ability at 10 and 20°C was also assessed. Rhizobacterial isolates A-43, A-13, A-12, A-36, A-25, A-22 and A-34 was potent phosphate and zinc solubilizers. IAA production was estimated in the range from 2.12 to 43.24 μg/ml and 2.40 to 68.36 μg/ml in the presence of tryptophan at 10 and 20°C respectively. Maximum GA production was recorded with A-43, A-13, A-12 and A-25 at 10 and 20°C. Similarly highest siderophore production was shown by bacterial culture A-6 (250.4 µg/ml and 90.5 µg/ml) and A-43 (225.9 µg/ml and 80.6 µg/ml) at both temperatures. Also, isolates A-43, A-36, A-13 and A-12 were resistant to many antibiotics like ampicillin (25 ïg/disc), tetracycline (10 ïg/disc), streptomycin (10 ïg/disc) etc. These four potent rhizobacterial isolates improved germination, root and shoot length and fresh weight of wheat seedlings as compared to uninoculated control under axenic conditions.
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