Effect of nitrogen on fungal growth efficiency. (3rd July 2020)

• Record Type: Journal Article
• Authors: Di Lonardo, D. P.; van der Wal, A.; Harkes, P.; de Boer, W.
• Is Part Of: Plant biosystems. Volume 154:Number 4(2020)
• Page Start: 433
• Page End: 437
• Publication Date: 2020-07-03
• Subjects: C:N ratios -- ergosterol -- growth efficiency -- respiration -- saprotrophic fungi; Botany -- Periodicals; Biological systems -- Periodicals; Plants -- Periodicals; 581
• DOI: 10.1080/11263504.2020.1779849
• Languages: English
• ISSNs: 1126-3504

Abstract

Abstract: The contribution of fungi to carbon (C) and nitrogen (N) cycling is related to their growth efficiency (amount of biomass produced per unit of substrate utilized). The concentration and availability of N influence the activity and growth efficiency of saprotrophic fungi. When N is scarce in soils, fungi have to invest more energy to obtain soil N, which could result in lower growth efficiencies. Yet, the effect of N on the growth efficiencies of individual species of fungi in soil has not been studied extensively. In this study, we investigated the influence of different concentrations of mineral N on the growth efficiency of two common soil fungi, Trichoderma harzianum and Mucor hiemalis in a soil-like environment. We hypothesized that a higher N availability will coincide with higher biomass production and growth efficiency. We measured fungal biomass production and respiration fluxes in sand microcosms amended with cellobiose and mineral N at different C:N ratios. For both fungal species lower C:N ratios resulted in the highest biomass production as well as the highest growth efficiency. This may imply that when N is applied concurrently with a degradable C source, a higher amount of N will be temporarily immobilized into fungal biomass.