Microbial delignification with white rot fungi improves forage digestibility.
Identifieur interne : 000E01 ( Main/Exploration ); précédent : 000E00; suivant : 000E02Microbial delignification with white rot fungi improves forage digestibility.
Auteurs : D E Akin [États-Unis] ; A. Sethuraman ; W H Morrison ; S A Martin ; K E ErikssonSource :
- Applied and environmental microbiology [ 0099-2240 ] ; 1993.
Abstract
Three wild-type white rot fungi and two cellulase-less mutants developed from Phanerochaete chrysosporium K-3 (formerly Sporotrichum pulverulentum) were tested for their ability to delignify grass cell walls and improve biodegradation by rumen microorganisms. Fungal-treated and control stems of Bermuda grass were analyzed for their content of ester- and ether-linked aromatics by using alkali extraction and gas chromatography, for in vitro dry weight digestion and production of volatile fatty acids in in vitro fermentations with mixed ruminal microorganisms, for loss of lignin and other aromatics from specific cell wall types by using microspectrophotometry, and for structural changes before and after in vitro degradation by rumen microorganisms by using transmission electron microscopy. P. chrysosporium K-3 and Ceriporiopsis subvermispora FP 90031-sp produced the greatest losses in lignin and improved the biodegradation of Bermuda grass over that of untreated control substrate. However, C. subvermispora removed the most lignin and significantly improved biodegradation over all other treatments. Phellinus pini RAB-83-19 and cellulase-less mutants 3113 and 85118 developed from P. chrysosporium K-3 did not improve the biodegradation of Bermuda grass lignocellulose. Results indicated that C. subvermispora extensively removed ester-linked p-coumaric and ferulic acids and also removed the greatest amount of non-ester-linked aromatics from plant cell walls. Microscopic observations further indicated that C. subvermispora removed esters from parenchyma cell walls as well as esters and lignin from the more recalcitrant cell walls (i.e., sclerenchyma and vascular tissues). C. subvermispora improved in vitro digestion and volatile fatty acid production by ruminal microorganisms by about 80%, while dry matter loss due to fungi was about 20% greater than loss in untreated control stems. The chemical and structural studies used identified sites of specific fungal attack and suggested mechanisms whereby improvement occurred.
DOI: 10.1128/AEM.59.12.4274-4282.1993
PubMed: 16349123
PubMed Central: PMC195896
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Box 5677, Athens, Georgia 30613, and Department of Biochemistry and Department of Animal and Dairy Science, University of Georgia, Athens</wicri:cityArea></affiliation></author><author><name sortKey="Sethuraman, A" sort="Sethuraman, A" uniqKey="Sethuraman A" first="A" last="Sethuraman">A. Sethuraman</name></author><author><name sortKey="Morrison, W H" sort="Morrison, W H" uniqKey="Morrison W" first="W H" last="Morrison">W H Morrison</name></author><author><name sortKey="Martin, S A" sort="Martin, S A" uniqKey="Martin S" first="S A" last="Martin">S A Martin</name></author><author><name sortKey="Eriksson, K E" sort="Eriksson, K E" uniqKey="Eriksson K" first="K E" last="Eriksson">K E Eriksson</name></author></titleStmt><publicationStmt><idno type="wicri:source">PubMed</idno><date when="1993">1993</date><idno type="RBID">pubmed:16349123</idno><idno type="pmid">16349123</idno><idno type="pmc">PMC195896</idno><idno type="doi">10.1128/AEM.59.12.4274-4282.1993</idno><idno type="wicri:Area/Main/Corpus">000D77</idno><idno type="wicri:explorRef" wicri:stream="Main" wicri:step="Corpus" wicri:corpus="PubMed">000D77</idno><idno type="wicri:Area/Main/Curation">000D77</idno><idno type="wicri:explorRef" wicri:stream="Main" wicri:step="Curation">000D77</idno><idno type="wicri:Area/Main/Exploration">000D77</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en">Microbial delignification with white rot fungi improves forage digestibility.</title><author><name sortKey="Akin, D E" sort="Akin, D E" uniqKey="Akin D" first="D E" last="Akin">D E Akin</name><affiliation wicri:level="2"><nlm:affiliation>Russell Research Center, Agricultural Research Service, U.S. Department of Agriculture, P.O. 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Sethuraman</name></author><author><name sortKey="Morrison, W H" sort="Morrison, W H" uniqKey="Morrison W" first="W H" last="Morrison">W H Morrison</name></author><author><name sortKey="Martin, S A" sort="Martin, S A" uniqKey="Martin S" first="S A" last="Martin">S A Martin</name></author><author><name sortKey="Eriksson, K E" sort="Eriksson, K E" uniqKey="Eriksson K" first="K E" last="Eriksson">K E Eriksson</name></author></analytic><series><title level="j">Applied and environmental microbiology</title><idno type="ISSN">0099-2240</idno><imprint><date when="1993" type="published">1993</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Three wild-type white rot fungi and two cellulase-less mutants developed from Phanerochaete chrysosporium K-3 (formerly Sporotrichum pulverulentum) were tested for their ability to delignify grass cell walls and improve biodegradation by rumen microorganisms. Fungal-treated and control stems of Bermuda grass were analyzed for their content of ester- and ether-linked aromatics by using alkali extraction and gas chromatography, for in vitro dry weight digestion and production of volatile fatty acids in in vitro fermentations with mixed ruminal microorganisms, for loss of lignin and other aromatics from specific cell wall types by using microspectrophotometry, and for structural changes before and after in vitro degradation by rumen microorganisms by using transmission electron microscopy. P. chrysosporium K-3 and Ceriporiopsis subvermispora FP 90031-sp produced the greatest losses in lignin and improved the biodegradation of Bermuda grass over that of untreated control substrate. However, C. subvermispora removed the most lignin and significantly improved biodegradation over all other treatments. Phellinus pini RAB-83-19 and cellulase-less mutants 3113 and 85118 developed from P. chrysosporium K-3 did not improve the biodegradation of Bermuda grass lignocellulose. Results indicated that C. subvermispora extensively removed ester-linked p-coumaric and ferulic acids and also removed the greatest amount of non-ester-linked aromatics from plant cell walls. Microscopic observations further indicated that C. subvermispora removed esters from parenchyma cell walls as well as esters and lignin from the more recalcitrant cell walls (i.e., sclerenchyma and vascular tissues). C. subvermispora improved in vitro digestion and volatile fatty acid production by ruminal microorganisms by about 80%, while dry matter loss due to fungi was about 20% greater than loss in untreated control stems. The chemical and structural studies used identified sites of specific fungal attack and suggested mechanisms whereby improvement occurred.</div></front></TEI><pubmed><MedlineCitation Status="PubMed-not-MEDLINE" Owner="NLM"><PMID Version="1">16349123</PMID><DateCompleted><Year>2010</Year><Month>06</Month><Day>25</Day></DateCompleted><DateRevised><Year>2020</Year><Month>07</Month><Day>27</Day></DateRevised><Article PubModel="Print"><Journal><ISSN IssnType="Print">0099-2240</ISSN><JournalIssue CitedMedium="Print"><Volume>59</Volume><Issue>12</Issue><PubDate><Year>1993</Year><Month>Dec</Month></PubDate></JournalIssue><Title>Applied and environmental microbiology</Title><ISOAbbreviation>Appl Environ Microbiol</ISOAbbreviation></Journal><ArticleTitle>Microbial delignification with white rot fungi improves forage digestibility.</ArticleTitle><Pagination><MedlinePgn>4274-82</MedlinePgn></Pagination><Abstract><AbstractText>Three wild-type white rot fungi and two cellulase-less mutants developed from Phanerochaete chrysosporium K-3 (formerly Sporotrichum pulverulentum) were tested for their ability to delignify grass cell walls and improve biodegradation by rumen microorganisms. Fungal-treated and control stems of Bermuda grass were analyzed for their content of ester- and ether-linked aromatics by using alkali extraction and gas chromatography, for in vitro dry weight digestion and production of volatile fatty acids in in vitro fermentations with mixed ruminal microorganisms, for loss of lignin and other aromatics from specific cell wall types by using microspectrophotometry, and for structural changes before and after in vitro degradation by rumen microorganisms by using transmission electron microscopy. P. chrysosporium K-3 and Ceriporiopsis subvermispora FP 90031-sp produced the greatest losses in lignin and improved the biodegradation of Bermuda grass over that of untreated control substrate. However, C. subvermispora removed the most lignin and significantly improved biodegradation over all other treatments. Phellinus pini RAB-83-19 and cellulase-less mutants 3113 and 85118 developed from P. chrysosporium K-3 did not improve the biodegradation of Bermuda grass lignocellulose. Results indicated that C. subvermispora extensively removed ester-linked p-coumaric and ferulic acids and also removed the greatest amount of non-ester-linked aromatics from plant cell walls. Microscopic observations further indicated that C. subvermispora removed esters from parenchyma cell walls as well as esters and lignin from the more recalcitrant cell walls (i.e., sclerenchyma and vascular tissues). C. subvermispora improved in vitro digestion and volatile fatty acid production by ruminal microorganisms by about 80%, while dry matter loss due to fungi was about 20% greater than loss in untreated control stems. 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Sethuraman</name></noCountry><country name="États-Unis"><region name="Géorgie (États-Unis)"><name sortKey="Akin, D E" sort="Akin, D E" uniqKey="Akin D" first="D E" last="Akin">D E Akin</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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