Effect of Cd+2 on phosphate solubilizing abilities of soil-borne micromycetes isolated from Phragmites australis-rhizosphere

5^th International Conference on Environmental Toxicology and Ecological Risk Assessment

September 12-13, 2016 Phoenix, USA

Refugio Rodriguez Vazquez and Roberto Zuniga Silva

National Polytechnic Institute, Mexico

Posters & Accepted Abstracts: J Environ Anal Toxicol

Abstract :

The aims of this work were to evaluate the P-solubilization and Hydrogen Peroxide (H2O2) production by the soil-borne micromycetes, Aspergillus japonicus and Penicillium italicum isolated from Phragmites australis-rhizosphere and to study the effect of several concentrations of Cadmium (Cd2+) on both variables. Our results showed that P. italicum achieved a higher P-solubilization and H2O2 production than Aspergillus japonicus and Penicillium sp., only P. italicum showed a positive correlation (R2=0.71) between P-solubilization and H2O2 production. In dose�response assays, P. italicum were also more tolerant to Cd2+ (0.31mM) compared to A. japonicus (0.26 mM). Analysis of the 24 factorial experimental design showed that P-solubilization by P. italicum was negatively affected by increase in Cd2+ (p=0.04) and yeast extract (p=0.02) in the culture medium. However, H2O2 production was positively affected only by glucose (p=0.002). Fungal biomass production was reduced significantly (p=0.0009) by Cd2+ and increased (p=0.0003) by high glucose concentration in the culture medium. The tolerance and correlation between P-solubilization and H2O2 production in the presence of Cd2+, was strain and species dependent. P. italicum is promising for P-solubilization in soils contaminated with Cd2+, and may be an alternative for manufacture of bio-fertilizers to replace chemical fertilizers.

Biography :

Email: rrodrig@cinvestav.mx