Response of Cold-Tolerant Aspergillus spp. to Solubilization of Fe and Al Phosphate in Presence of Different Nutritional Sources

Abstract

Three species of Aspergillus, namely, A. niger, A. glaucus and A. sydowii, isolated from soil samples collected from the Indian Himalayan Region (IHR), have been investigated for solubilization of aluminium phosphate and iron phosphate in the presence of different carbon and nitrogen sources. Preference of each fungal species varied for nitrogen and carbon sources, in terms of phosphate-solubilization. Among three species, Aspergillus niger gave the best results; it solubilized 32% and 8% of the supplemented aluminium phosphate and iron phosphate, respectively. The results indicated that the effect of carbon and nitrogen sources can influence the phosphate solubilizing efficiency of all the three Aspergillus spp. tested. All the three species were found to be plant-growth promoters in bioassays conducted under greenhouse conditions. The Al and Fe phosphate solubilization efficiency, investigated in the present study, is at the lower end of their previously reported tricalcium phosphate solubilization efficiency. The cultures are likely to have better field applications in agrobiotechnology, due to their potential towards solubilization of Al and Fe phosphates, which are known to have lower solubility through microbial activity.

Endophytic Bacillus strains enhance pearl millet growth and nutrient uptake under low-P

“…Our results of soluble P released by Bacillus grown on a medium containing FePO 4 varied from 34.25 to 52.22 mg L −1 and were lower than the previously reported values for Ca-P solubilization by the same isolates, which ranged from 112 to 179 mg L −1 21 . Similar results, reported previously with different bacterial species, have shown that Fe-P and Al-P are less soluble than Ca-P 31, 32. The highest Fe-P solubilization has been documented in rhizobacteria and fungi4, 32, 33; however, our isolates showed higher solubilization than reported for endophytic bacteria isolated from peanuts, that ranged from 13.9 ± 0.3 to 37.4 ± 2.0 mg L −1 12 .…”

Phosphate solubilization by fungi with nematicidal potential

“…In general, the solubilization of iron phosphate (strengite) in this study was low in comparison with the calcium phosphate (hydroxyapatite). Previous studies have indicated that iron phosphate compounds are less susceptible to microbial solubilization than calcium phosphates (Rinu et al, 2013). pH of the medium during growth are efficient phosphate solubilizers (Nahas, 1996;Li et al, 2016).…”

Microbial Ecology from the Himalayan Cryosphere Perspective

“…In the recent two decades, several researchers have published the potential utilization of microbial strains from Indian Himalaya. Rhodococcus, Pseudomonas, Bacillus, Serratia, and Ascomycetous fungi (Trichoderma, Aspergillus, Penicillium) have been recognized as promising candidates in agriculture and forestry [100,[109][110][111][112], but they need further attention for obtaining a form of valuable product. Recently, a strain of Stenotrophomonas with multiple plant growth promoting activities and possibilities to utilize as biofertilizer has been reported [113].…”