Effect of ligninolytic axenic and coculture white-rot fungi on rice straw chemical composition and in vitro fermentation characteristics

Abstract

The study sought to investigate the potentials of axenic cultures of Pleurotus ostreatus, Phanerochaete chrysosporium and their coculture (P. chrysosporium and P. ostreatus) to break down lignin and to enhance the rumen fermentability of rice straw. Rice straw was fermented by two lignin-degrading fungi, namely, P. ostreatus, P. chrysosporium and its coculture (P. ostreatus and P. chrysosporium) with uninoculated straw as control under solid-state fermentation employing a completely randomized research design. The coculture exhibited a mutual intermingling plus inhibition interaction. The fungi treatment increased the crude protein from (5.1%) in the control to (6.5%, 6.6%, and 6.7%) in the P. ostreatus, P. chrysosporium and coculture respectively. The coculture treated straw had a lower lignin content (5.3%) compared to the P. chrysosporium (6.2%) with the P. ostreatus recording the least (3.3%) lignin fraction. Treatment of rice straw with coculture improved the in vitro dry matter digestibility (68.1%), total volatile fatty acids (35.3 mM), and total gas (57.4 ml/200 mg) compared to P. chrysosporium (45.1%, 32.2 mM, 44.4 ml/200 mg) but was second to P. ostreatus (75.3%, 38.3 mM, 65.6 ml/200 mg). Instead of an anticipated synergistic effect from the coculture, a competitive antagonistic effect was rather observed at the end of the study, a condition that can be attributed to the coculture behavior.

Biological depolymerization of lignin using laccase harvested from the autochthonous fungus Schizophyllum commune employing various production methods and its efficacy in augmenting in vitro digestibility in ruminants

“…Many researchers have reported similar observations for straw treatment under SSF conditions. Results obtained in the present study are in agreement with the experiments conducted by Datsomor et al 70 where pretreatment of rice straw using P. ostreatus showed a marked decrease in acid detergent lignin when compared to control. The IVDMD and the total VFA concerning P .…”

Feeding Values of Non-Biodegraded and Biodegraded Cassava Root Sievate for Goats Using in vitro Gas Production Technique

“…In this present study, it was observed that the CF, NDF, ADF and ADL were significantly (p<0.05) higher in NBCRS than the biodegraded groups. Similar observations were made by Akinfemi et al 24 , Akinfemi et al 4 , Datsomor et al 5 , Barde et al 20 . The lower values reported for the CF and the fibre fractions may be due to the hydrolytic nature of the fungi species, which could have delignified the lignocelluloses complex and utilised them by microbes during fermentation thus converting them to more useful components like protein or NFE.…”

“…The possibility for turning agricultural waste into valueadded feedstuffs for ruminants with some species of white-rot fungi (Pleurotus ostreatus, Pleurotus tuber-regium, Pleurotus pulmonarius, Pleurotus sajor caju and Lentinus subnudus) have been investigated by various researchers Akinfemi et al 4 , Datsomor et al 5 . Their experiments revealed that biodegradation of agro-wastes produced significantly higher crude protein content and a significant decrease in cellulose contents.…”

Carbon sequestration efficiency in red paddy soil originating from different parent materials in Jiangxi, China

“…In the present study, the organic C input was mainly rice straw at all three sites, and the respective quantities of organic C input were 4.02 (argillaceous rock), 2.96 (quaternary red clay), and 2.13 t ha −1 yr −1 (granite). The lignin content of rice straw is about 10−22% (Datsomor et al., 2022; Rodríguez et al., 2008). Therefore, the more imported rice straw, the more imported lignin, the higher the exogenous C input, the higher is the recalcitrant SOC content.…”