Selective ligninolysis of wheat straw and wood chips by the white-rot fungus Lentinula edodes and its influence on in vitro rumen degradability.
BACKGROUND
The present work investigated the influence of lignin content and composition in the fungal treatment of lignocellulosic biomass in order to improve rumen degradability. Wheat straw and wood chips, differing in lignin composition, were treated with Lentinula edodes for 0, 2, 4, 8 and 12 wk and the changes occurring during fungal degradation were analyzed using pyrolysis-gas chromatography-mass spectrometry and detergent fiber analysis.


RESULTS
L. edodes preferentially degraded lignin, with only limited cellulose degradation, in wheat straw and wood chips, leaving a substrate enriched in cellulose. Syringyl (S)-lignin units were preferentially degraded than guaiacyl (G)-lignin units, resulting in a decreased S/G ratio. A decreasing S/G ratio (wheat straw: r = -0.72, wood chips: r = -0.75) and selective lignin degradation (wheat straw: r = -0.69, wood chips: r = -0.88) were correlated with in vitro gas production (IVGP), a good indicator for rumen degradability.


CONCLUSIONS
L. edodes treatment increased the IVGP of wheat straw and wood chips. Effects on IVGP were similar for wheat straw and wood chips indicating that lignin content and 3D-structure of cell walls influence in vitro rumen degradability more than lignin composition.
Animal Nutrition Group, Wageningen University, De Elst 1, 6708 WD Wageningen, The Netherlands.
Sandra J A
SJ
van Kuijk
Instituto de Recursos Naturales y Agrobiologica de Sevilla (IRNAS-CSIC), Avenida Reina Mercedes, 10, 42012 Seville, Spain.
José C
JC
Del Río
Instituto de Recursos Naturales y Agrobiologica de Sevilla (IRNAS-CSIC), Avenida Reina Mercedes, 10, 42012 Seville, Spain.
Jorge
J
Rencoret
Instituto de Recursos Naturales y Agrobiologica de Sevilla (IRNAS-CSIC), Avenida Reina Mercedes, 10, 42012 Seville, Spain.
Ana
A
Gutiérrez
Plant Breeding, Wageningen University, Droevendaalsesteeg 1, 6708 PB Wageningen, The Netherlands.
Anton S M
AS
Sonnenberg
Plant Breeding, Wageningen University, Droevendaalsesteeg 1, 6708 PB Wageningen, The Netherlands.
Johan J P
JJ
Baars
Animal Nutrition Group, Wageningen University, De Elst 1, 6708 WD Wageningen, The Netherlands.
Wouter H
WH
Hendriks
Animal Nutrition Group, Wageningen University, De Elst 1, 6708 WD Wageningen, The Netherlands.
John W
JW
Cone
Fungal treatment; In vitro rumen degradability; Lignocellulosic biomass; Py-GC/MS
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