Influence of saprophytic fungi and inorganic additives on enzyme activities and chemical properties of the biodegradation process of wheat straw for the production of organo-mineral amendments. (1st February 2020)

• Record Type: Journal Article
• Authors: Medina, Jorge; Monreal, Carlos M.; Orellana, Luis; Calabi-Floody, Marcela; González, María E.; Meier, Sebastián; Borie, Fernando; Cornejo, Pablo
• Is Part Of: Journal of environmental management. Volume 255(2020)
• Publication Date: 2020-02-01
• Subjects: Enzymatic activities -- Lignocellulosic materials -- Organic matter stabilization; Environmental policy -- Periodicals; Environmental management -- Periodicals; Environment -- Periodicals; Ecology -- Periodicals; 363.705
• DOI: 10.1016/j.jenvman.2019.109922
• Languages: English
• ISSNs: 0301-4797

Abstract

Abstract: Cellulose and lignin as main components of crop residues have a significant influence on composting operations and composition of the final products. Both are strongly associated, and lignin can be considered an important barrier during the biodegradation process of lignocellulosic materials. Saprophytic fungi are efficient lignin degraders due to their complex enzymatic system. Therefore, the influence of the inoculation of saprophytic fungi ( Coriolopsis rigida, Pleurotus ostreatus, Trichoderma harzianum and Trametes versicolor ) and the supply of inorganic additives (Al2 O3, Fe2 O3 and allophanic soil) that promote the stabilization of carbon (C), were analyzed in the biodegradation of wheat straw (WS). The activity of Laccase (LAC), manganese peroxidase (MnP) and β-glucosidase and changes in temperature, pH and E4 /E6 ratio were analyzed in a biodegradation process of 126 days. The activity of LAC, MnP and the E4 /E6 ratio were significantly influenced and increased (enzymes) by fungi species, inorganic additives, and time of inorganic material addition, as well as their interactions (p < 0.05). The WS inoculated with T. versicolor showed the highest average activities for LAC, MnP and β-glucosidase (2000, 220 UL −1 and 400 μmol pNP g −1 h −1 respectively). Furthermore, the addition of Al2 O3 and Fe2 O3 increased all the activities regarded to the decomposition of WS and influenced the changes associated with the stabilization of OM in composted WS. In conclusion, the inoculation of WS with T. versicolor in combination with metal oxides improved the enzyme related to the biodegradation process of WS favorizing its stabilization in the medium time, which is of importance in the composting of residues with high C/N ratio. Highlights: All the factors and their interactions influenced the enzyme activity and E4 /E6 ratio. T.versicolor showed the higher enzymatic activities related to decomposition of residues. Metallic oxides enhance the activity of LAC, MnP and β-glucosidase. High correlation between the activity of all the studied enzymes. The use of fungi and additives improved the composting of residues with high C/N.