Phosphorus Solubilizing Characteristics of Penicillium sp.18 and Its Antifungal Effect
Penicillium sp.18 was selected as the research object,and its phosphorus solubilizing and accumulating characteristics were preliminarily studied under the condition of pure culture.The re-sults show that Penicillium sp.18 could grow using insoluble Ca3(PO4)2,AlPO4 and FePO4 as the only phosphorus source,and showed the characteristic of releasing available phosphorus from insoluble phosphate.On the 5th day of culture,the available phosphorus content in the solution reached 392.27,53.37 and 62.84 mg/L,respectively.Penicillium sp.18 is distinguished from the reported p-soluble strains in that it also has p-accumulating properties.Under aerobic conditions,the biomass and phosphorus uptake showed an increasing trend with the prolongation of the culture time.On the 5th day of the culture,the dry weight and phosphorus uptake of the bacteria were 1.65 g and,16.89 mg/L,respectively.84％of the available phosphorus in the solution was absorbed into the my-celium,forming a large number of polyphosphate-heterophytic particles.Different carbon sources,ni-trogen sources and environmental factors had different effects on the growth and phosphorus uptake of Penicillium sp.18.As for growth and reproduction,glucose and ammonium salt had promoting ef-fect.In terms of phosphorus uptake,small organic acids(acetate and propionate)and oxygen were beneficial to phosphorus uptake.In addition,we analysed and discussed the phosphorus accumula-tion characteristics and driving factors of Penicillium sp.18,and put forward an application techno-log route based on the"aerobic phosphorus absorption and anaerobic phosphorus release"character-istics of the phosphorus accumulating bacteria,and in production practice,by taking the agricultural measures such as farming,irrigation,orsevere rotation to adjust the content of dissolved oxygen in soil,to regulate the transformation process of this type of bacterial strains in soil inorganic phospho-rus,and improving the phosphorus nutritional status of crops and increasing phosphorus fertilizer uti-lization efficiency.
万方数据
维普
