SPECTROSCOPIC INDEXES CAN REVEAL ABILITY OF MICROSCOPIC FILAMENTOUS FUNGI TO TRANSFORM HUMIC SUBSTANCES

Fedoseeva, E.; Khundzhua, D.; Patsaeva, S.; Stepanov, A.; Yakimenko, O.; Terekhova, V.A.

Авторы: Fedoseeva E., Khundzhua D., Patsaeva S., Stepanov A., Yakimenko O., Terekhova V.A.
Сборник: The Book of Abstracts of the International Conference “Natural Organic Matters geochemical flows and properties: from theory to practice” (HUMIC)
Тезисы
Год издания: 2019
Место издания: University of Latvia Riga
Первая страница: 58
Последняя страница: 58
Аннотация: Humic substances (HSs), both natural and industrially manufactured, provide various effects: as agents for remediation of degraded soils, as plant biostimulants and others (Yakimenko and Terekhova, 2011; Calvo et al., 2014). Potential benefits of HSs can be associated with direct nutrient values, plant physiological mechanisms, modifications in physical, chemical or biological components of soil health (Abbott et al., 2018). Soil filamentous fungi are involved in HS turnover (Gramss et al., 1999; Zavarzina et al., 2011). The study of interactions between HSs and soil filamentous fungi can help us to understand the sustainable soil functioning. The aim of the work was to perform multifaceted laboratory experiments on the transformation of various HS samples (industrial HSs and extracted humic acids) by soil filamentous fungi using a set of spectral indices. As a potential agent for HS decomposition, we used three strains: melanin containing phytopathogenic Alternaria alternatа, non-pigmented phytopathogenic Fusarium solani, and antagonistic Trichoderma harzianum. As spectral indices, we estimated absorbance ratio A250/A365, emission wavelength of the humic-type fluorescence, and fluorescence quantum yield measured with excitation at 355 nm (QY355) (Trubetskoy et al., 2018; Fedoseeva et al., 2018). The transformations of HSs under cultivation of A. alternatа led to increase of A250/A365 ratio, shortening of the emission wavelength, and growth in QY355 (Fedoseeva et al., 2018). Under cultivation of F. solani and T. harzianum, we did not find remarkable transformations of HSs. A positive correlation was observed between the accumulation of fungal biomass and the degree of HS decomposition. The obtained results show that fungi A. alternata, F. solani (phytopathogens) and T. harzianum (which is antagonistically active against alternaria and fusaria) have different patterns of interaction with HSs, and this fact should be considered when humic-based biostimulants are used.
Добавил в систему: Федосеева (Бандолина) Елена Васильевна

	ИСТИНА	Войти в систему Регистрация
	ИСТИНА ИНХС РАН
	Главная Поиск Статистика О проекте Помощь

ИСТИНА

ИСТИНА ИНХС РАН

SPECTROSCOPIC INDEXES CAN REVEAL ABILITY OF MICROSCOPIC FILAMENTOUS FUNGI TO TRANSFORM HUMIC SUBSTANCESтезисы доклада Тезисы

Прикрепленные файлы