Электронный архив

Iron-reducing bacteria decompose lignin by electron transfer from soil organic matter

Показать сокращенную информацию

dc.contributor.author Merino C.
dc.contributor.author Kuzyakov Y.
dc.contributor.author Godoy K.
dc.contributor.author Jofré I.
dc.contributor.author Nájera F.
dc.contributor.author Matus F.
dc.date.accessioned 2022-02-09T20:32:28Z
dc.date.available 2022-02-09T20:32:28Z
dc.date.issued 2021
dc.identifier.issn 0048-9697
dc.identifier.uri https://dspace.kpfu.ru/xmlui/handle/net/168867
dc.description.abstract Iron-reducing bacteria (IRB) are crucial for electron transfer in anaerobic soil microsites. The utilization of the energy gathered by this mechanism by decomposers of organic matter is a challenging and fascinating issue. We hypothesized that bacteria reducing Fe(III) (oxyhydr)oxides to soluble Fe(II) obtain electrons from reduced soil organic matter (SOMr) involving lignin oxidation. Iron-reducing bacteria were isolated from topsoils of various climates (humid temperate, cold temperate, subpolar), vegetation types (mostly grasslands and forests), and derived from various parent materials treatments assigned as Granitic, Volcanic-allophanic, Fluvio-glacial, Basaltic-Antarctic and Metamorphic. After the screening of IRB by phospholipid fatty acid (PLFA) analysis and PCR identification (full-length 16S rDNA), the IRB were inoculated to 20 samples (five soils and 4 replicates) and a broad range of parallel processes were traced. Geobacter metallireducens and Geobacter lovleyi were the main Geobacteraceae-strains present in all soils and strongly increased the activity of ligninolytic enzymes: lignin peroxidase and manganese peroxidase. Carbon dioxide (CO2) released from IRB-inoculated soils was 140% higher than that produced by Fenton reactions (induced by H2O2 and Fe(II) addition) but 40% lower than in non-sterile soils. CO2 release was closely correlated with the produced Fe (II) and H2O2 consumption. The highest CO2 was released from Basaltic-Antarctic soils with the highest Fe content and was closely correlated with lignin depolymerization (detection by fluorescence images). All IRB oxidized the lignin contained in the SOM within a wide pH range and in soils from all parent materials. We present a conceptual model showing electron shuttling from SOM containing lignin (as a C and energy source) to IRB to produce energy and promote Fe(III) (oxyhydr)oxides reduction was proposed and discussed.
dc.relation.ispartofseries Science of the Total Environment
dc.subject Anaerobic carbon cycling
dc.subject Fe reducing bacteria
dc.subject Fenton and Fenton-like reactions
dc.subject Lignin oxidation
dc.subject Peroxidase enzyme
dc.title Iron-reducing bacteria decompose lignin by electron transfer from soil organic matter
dc.type Article
dc.relation.ispartofseries-volume 761
dc.collection Публикации сотрудников КФУ
dc.source.id SCOPUS00489697-2021-761-SID85095807673


Файлы в этом документе

Данный элемент включен в следующие коллекции

  • Публикации сотрудников КФУ Scopus [24551]
    Коллекция содержит публикации сотрудников Казанского федерального (до 2010 года Казанского государственного) университета, проиндексированные в БД Scopus, начиная с 1970г.

Показать сокращенную информацию

Поиск в электронном архиве


Расширенный поиск

Просмотр

Моя учетная запись

Статистика