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Phosphate solubilising microorganisms (PSM) (bacteria and fungi) associated with Salix alba Linn. from Lahaul and Spiti valleys of Himachal Pradesh were isolated on Pikovskaya (PVK), modified Pikovskaya (MPVK) and National Botanical Research Institute agar (NBRIP) media by spread plating. The viable colony count of P-solubilising bacteria (PSB) and fungi (PSF) was higher in rhizosphere than that of non-rhizosphere. The frequency of PSM was highest on MPVK followed by NBRIP and PVK agar. The maximum proportion of PSM out of total bacterial and fungal count was found in upper Keylong while the least in Rong Tong. The PSB frequently were Gram-positive, endosporeforming, motile rods and belonged to Bacillus sp. The PSF mainly belonged to Penicillium sp., Aspergillus fumigatus, A. niger, A. spp. and non-sporulating sterile. Amongst the isolates with high efficiency for tricalcium phosphate (TCP) solubilisation, seven bacterial and seven fungal isolates dissolved higher amount of P from North Carolina rock phosphate (NCRP) than Mussoorie rock phosphate (MRP) and Udaipur rock phosphate (URP). However, the organisms solubilised higher-P in NBRIP broth than PVK broth. SBC5 (Bacillus sp.) and SBC7 (Bacillus sp.) bacterial isolates exhibited maximun P solubilisation (40 and 33 μg ml(-1) respectively) whereas FC28 (Penicillium sp.) isolate (52.3 μg ml(-1)) amongst fungi while solubilising URP. The amount of P solubilised was positively correlated with the decrease in pH of medium. SBC5 (Bacillus sp.), SBC7 (Bacillus sp.) and SBC4 (Micrococcus) decreased the pH of medium from 6.8 to 6.08 while FC28 (Penicillium sp.) and FC39 (Penicillium sp.) isolates of fungi recorded maximum decrease in pH of medium from 6.8 to 5.96 in NBRIP broth.

indian journal of microbiology/indian journal of microbiology (print)

Isolation and characterisation of phosphate solubilising microorganisms from the cold desert habitat of Salix alba Linn. in trans Himalayan region of Himachal Pradesh