Interaction of different pigmented micromycetes with humic substances and stability of soil biomes: spectral characterization

Humic substances (HSs) support the sustainable functioning of soils. Filamentous fungi are involved in HSs turnover, demonstrating ability to degrade and simultaneously synthesize HSs. The aim work was study transformation HS samples by soil filamentous using a set spectral indices connect those findings stability biomes. We used three fungal strains: melanin containing Alternaria alternatа, non-pigmented Fusarium solani Trichoderma harzianum. Absorption fluorescence spectra were measured after cultivating various concentrations (200 mg/L for HPs 100 HAs) sucrose (3 0.3 g/L). transformations under cultivation A alternatа led increase absorbance ratio A250/A365, shortening emission wavelength, growth quantum yield QY355. Under F. T. harzianum we did not observe these changes. This indicates that among strains studied, A. alternata degrades most actively. data obtained principal component analysis showed phytopathogenic alternata, antagonistically active against alternaria fusaria have different patterns interaction with HSs; this should be considered when humic-based biostimulants used.