The growth and absorption kinetics of different endophytic fungi in the presence Al3+were analyzed to identify strains with strong aluminum resistance.Five strains of endophytic fungi isolated from aluminum-resistant trees in southern acidic red soils were selected for the experiment,including Pestalotiopsis,Alternaria,Coniothyrium,Penicillium,and Thermomyces spp.These strains were subjected to five different Al3+concentration gradients(0,0.555,0.746,1.111,and 1.852 mmol·L-1).The growth characteristics of these fungi strains and their absorption and adsorption of Al3+,cation exchange capacity,and absorption kinetics were studied.The results showed that the overall biomass of the five endophytic fungal strains increased,but decreased at higher Al3+concentrations.All five strains had strong aluminum tolerance when the Al3+concentration was below 1.111 mmol·L-1.However,their tolerance significantly decreased as the concentration reached 1.852 mmol·L-1.The absorption and adsorption of Al3+by the various strains increased with increasing aluminum concentration.Compared with the other fungal species tested,Penicillium spp.had the greatest biomass(158 mg),a higher tolerance index,more favorable absorption kinetics indicators,and higher adsorptive Al3+and lower absorbent Al3+contents.Based on the above indicators,the cell walls of Penicillium spp.have greater adsorption of Al3+compared to the cell walls of the other four strains,which may help prevent Al3+entering the cell.
关键词
内生真菌/铝胁迫/吸收动力学/阳离子交换量/吸收和吸附
Key words
endophytic fungi/aluminum stress/absorption kinetics/cation exchange capacity/absorption and adsorption
维普
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