Solid-state fermentation, lignin degradation and resulting digestibility of wheat straw fermented by selected white-rot fungi

Agosín, Eduardo; Odier, Étienne

doi:10.1007/bf00249988

Cited by 78 publications

(23 citation statements)

References 24 publications

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“…After a 30-day incubation, the pH dropped from 6.7 (control) to 3.8-4.6 (decayed wheat straw). The pH may be influenced, at least in part, by lignin degradation products in the white-rotted straw as reported by Agosin and Odier (1985).…”

Section: Alteration Of Chemical Compositionmentioning

confidence: 78%

Effect of six species of white-rot basidiomycetes on the chemical composition and rumen degradability of wheat straw.

Jalč

Siroka

Čerešňáková

1997

J. Gen. Appl. Microbiol.

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This study was conducted to investigate changes in in vitro dry matter digestibility (IVDMD), volatile fatty acids (VFA) production and cell-wall constituent degradation in wheat straw treated with six white-rot fungi: Daedalea quercina, Hericium clathroides, Phelinus laevigatus, lnonotus andersonii, lnonotus obliquus, and lnonotus dryophilus. The incubation of wheat straw for 30 days at 28°C improved IVDMD from 41.4 (control) to 59.2% for D. quercina, 56.3% for H. clathroides, 50.2% for P. laevigatus, 51.4% for 1L andersonii, 52% for 1L obliquus, and 55.9% for 1L dryophilus. In contrast, the growth of fungi was accompanied by the dry matter loss of wheat straw: 43% for D. quercina, 12% for H. clathroides, and 22-25% for the other fungi. It is evident that the increase in digestibility by D. quercina was not offset by a loss of dry matter. The total VFA production during the rumen fermentation of fungus-treated straw was slightly increased by H. clathroides and 1L dryophilus only. Neutral detergent fiber (NDF) and acid detergent fiber (ADF) were reduced in fungus-treated straw. Out of the three fractions (hemicellulose, cellulose, and lignin), hemicellulose and lignin showed the largest proportionate loss after inoculation with the fungi D. quercina, H. clathroides, P. laevigatus, and 1L obliquus. The other two fungi showed the largest proportionate loss in cellulose and hemicellulose contents. The results of this study suggest that the digestion enhancement of wheat straw colonized by white-rot fungi is regulated by complex factors including the degradation of structural carbohydrates and lignin.

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Section: Alteration Of Chemical Compositionmentioning

confidence: 78%

Effect of six species of white-rot basidiomycetes on the chemical composition and rumen degradability of wheat straw.

Jalč

Siroka

Čerešňáková

1997

J. Gen. Appl. Microbiol.

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“…The concept of preferential delignification of lignocellulose materials by white-rot fungi has been applied to increase the nutritional value of forages (Agosin et al 1985;Akin et al 1995;Chen et al 1995;Zadrazil & Isikhuemhen 1997). This increased digestibility provides organic carbon that can be fermented to organic acids in an anaerobic environment, such as the rumen.…”

Section: Animal Feedmentioning

confidence: 99%

“…The pulp and paper industry discovered lignocellulose biotechnology could improve process efficiency through savings in money and energy (Breen & Singleton 1999;Scott et al 1998). Others aimed at improving digestibility of nutritionally poor forages by exposing these lignocellulosics to white-rot fungi (Agosin & Odier 1985;Karunanandaa et al 1992).…”

Section: Introductionmentioning

confidence: 99%

Lignocellulose biodegradation: Fundamentals and applications

Malherbe

Cloete

2002

Rev Environ Sci Biotechnol

400

163

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“…The sustained effort of an increasing number of research groups has yielded much physiological, biochemical and molecular genetical information on the system. If such laboratory knowledge is to be applied to this and other fungi to optimize biotechnological processes that include solid substrate fermentation (Agosin & Odier, 1985 ;Coughlan, 1989;Coughlan & Amaral Collaco, 1990;Kerem e t al., 1992) and bleaching of pulp (Addleman & Archibald, 1993;Kondo e t al., 1994;Michel et al, 1991 ;Paice et a!., 1993), methods must be available to study which genes are expressed in the synergistic process of lignocellulose degradation under scale-up conditions (Broda e t al., 1995). Strategies for genetic improvement of the organisms to be used are also desirable, and these are likely to be fundamentally different from those used, for example, in antibiotic production, which historically have involved cycles of mutagenesis and screening within one lineage, to produce strains that are high producers but otherwise crippled.…”

Section: Introductionmentioning

confidence: 99%

Informed strain improvement for lignin degradation by Phanerochaete chrysosporium

Wyatt

Broda²

1995

Microbiology

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The effect of breeding from the white rot fungus Phanemchaete chrysosporium ME446 on performance for lignin mineralization was examined. This model for informed strain improvement without mutagenesis is based on abundant restriction fragment length polymorphisms (RFLPs). Under optimized conditions for lignin mineralization, extracellular manganese peroxidase (MnP) but not lignin peroxidase (Lip) could be detected, so measurement of Lip activity is not a valid assay for lignin degradation. Mineralization of 14C-labelled synthetic lignin (14C-DHP) was used to compare the performance of the wild-type strain ME446 with those of sets of progeny strains. Meiotic progeny from strain ME446, heterokaryotic progeny of crosses between such strains, and meiotic progeny of one heterokaryotic strain were examined. In each case, a minority of strains performed more efficiently than the parental strain ME446. The greatest range of lignin-mineralization performance (70-fold) was found within the set of initial progeny of ME446 and the narrowest was within the set of secondary homokaryotic strains. This is consistent with the view that a moderate number of determinants contribute to lignin mineralization performance. However, performance did not correlate with the possession of any single allele of those for 38 previously defined RFLP markers. The results show that lignin mineralization performance can be improved by cycles of crosses and fruiting, without mutagenesis.

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Solid-state fermentation, lignin degradation and resulting digestibility of wheat straw fermented by selected white-rot fungi

Cited by 78 publications

References 24 publications

Effect of six species of white-rot basidiomycetes on the chemical composition and rumen degradability of wheat straw.

Effect of six species of white-rot basidiomycetes on the chemical composition and rumen degradability of wheat straw.

Lignocellulose biodegradation: Fundamentals and applications

Informed strain improvement for lignin degradation by Phanerochaete chrysosporium

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