Dual role of lignin in plant litter decomposition in terrestrial ecosystems

Autores
Austin, Amy Theresa; Ballaré, Carlos Luis
Año de publicación
2010
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Fil: Austin, Amy Theresa. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.
Fil: Austin, Amy Theresa. CONICET – Universidad de Buenos Aires. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.
Fil: Austin, Amy Theresa. Universidad de Buenos Aires. Facultad de Agronomía. Buenos Aires, Argentina.
Fil: Ballaré, Carlos Luis. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.
Fil: Ballaré, Carlos Luis. CONICET – Universidad de Buenos Aires. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.
Fil: Ballaré, Carlos Luis. Universidad de Buenos Aires. Facultad de Agronomía. Buenos Aires, Argentina.
Plant litter decomposition is a critical step in the formation of soil organicmatter, themineralizationoforganic nutrients, andthe carbon balance in terrestrial ecosystems. Biotic decomposition in mesic ecosystems is generally negatively correlated with the concentration of lignin, a group of complex aromatic polymers present in plant cell walls that is recalcitrant to enzymatic degradation and serves as a structural barrier impeding microbial access to labile carbon compounds. Although photochemical mineralization of carbon has recently been shown to be important in semiarid ecosystems, litter chemistry controls on photodegradative losses are not understood. We evaluated the importance of litter chemistry on photodegradation of grass litter and cellulose substrates with varying levels of lignin (cellulose-lignin (CL) substrates) under field conditions. Using wavelength-specific light attenuation filters, we found that light-driven mass loss was promoted by both UV and visible radiation. The spectral dependence of photodegradation correlated with the absorption spectrumof ligninbut not of cellulose. Fieldincubationsdemonstrated that increasing lignin concentration reduced biotic decomposition, as expected, but linearly increased photodegradation. In addition, lignin content in CL substrates consistently decreased in photodegradative incubations. We conclude that lignin has a dual role affecting litter decomposition, depending on the dominant driver (biotic or abiotic) controlling carbon turnover. Under photodegradative conditions, lignin is preferentially degraded because it acts as an effective light-absorbing compound over a wide range of wavelengths. This mechanistic understanding of the role of lignin in plant litter decomposition will allow formoreaccurate predictions of carbon dynamics in terrestrial ecosystems.
Fuente
Proceedings of the National Academy of Sciences of the United States of America
Vol.107, no.10
4618-4622
http://www.nasonline.org/
Materia
CARBON CYCLE
PHOTODEGRADATION
SEMIARID GRASSLANDS
ULTRAVIOLET RADIATION
CARBON
CELLULOSE
LIGNIN
POLYMER
ABSORPTION SPECTROSCOPY
CARBON DYNAMICS
ECOSYSTEM
GRASS
GRASSLAND
LAND BIOME
LIGHT
NONHUMAN
PLANT LITTER
ARGENTINA
BIODEGRADATION, ENVIRONMENTAL
PLANT LEAVES
PLANTS
POACEAE
SOIL
SPECTROPHOTOMETRY
Nivel de accesibilidad
acceso abierto
Condiciones de uso
acceso abierto
Repositorio
FAUBA Digital (UBA-FAUBA)
Institución
Universidad de Buenos Aires. Facultad de Agronomía
OAI Identificador
snrd:2010Austin

id FAUBA_b9cb6d3f4b48c2be00d8691c210730c4
oai_identifier_str snrd:2010Austin
network_acronym_str FAUBA
repository_id_str 2729
network_name_str FAUBA Digital (UBA-FAUBA)
spelling Dual role of lignin in plant litter decomposition in terrestrial ecosystemsAustin, Amy TheresaBallaré, Carlos LuisCARBON CYCLEPHOTODEGRADATIONSEMIARID GRASSLANDSULTRAVIOLET RADIATIONCARBONCELLULOSELIGNINPOLYMERABSORPTION SPECTROSCOPYCARBON DYNAMICSECOSYSTEMGRASSGRASSLANDLAND BIOMELIGHTNONHUMANPLANT LITTERARGENTINABIODEGRADATION, ENVIRONMENTALPLANT LEAVESPLANTSPOACEAESOILSPECTROPHOTOMETRYFil: Austin, Amy Theresa. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.Fil: Austin, Amy Theresa. CONICET – Universidad de Buenos Aires. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.Fil: Austin, Amy Theresa. Universidad de Buenos Aires. Facultad de Agronomía. Buenos Aires, Argentina.Fil: Ballaré, Carlos Luis. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.Fil: Ballaré, Carlos Luis. CONICET – Universidad de Buenos Aires. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.Fil: Ballaré, Carlos Luis. Universidad de Buenos Aires. Facultad de Agronomía. Buenos Aires, Argentina.Plant litter decomposition is a critical step in the formation of soil organicmatter, themineralizationoforganic nutrients, andthe carbon balance in terrestrial ecosystems. Biotic decomposition in mesic ecosystems is generally negatively correlated with the concentration of lignin, a group of complex aromatic polymers present in plant cell walls that is recalcitrant to enzymatic degradation and serves as a structural barrier impeding microbial access to labile carbon compounds. Although photochemical mineralization of carbon has recently been shown to be important in semiarid ecosystems, litter chemistry controls on photodegradative losses are not understood. We evaluated the importance of litter chemistry on photodegradation of grass litter and cellulose substrates with varying levels of lignin (cellulose-lignin (CL) substrates) under field conditions. Using wavelength-specific light attenuation filters, we found that light-driven mass loss was promoted by both UV and visible radiation. The spectral dependence of photodegradation correlated with the absorption spectrumof ligninbut not of cellulose. Fieldincubationsdemonstrated that increasing lignin concentration reduced biotic decomposition, as expected, but linearly increased photodegradation. In addition, lignin content in CL substrates consistently decreased in photodegradative incubations. We conclude that lignin has a dual role affecting litter decomposition, depending on the dominant driver (biotic or abiotic) controlling carbon turnover. Under photodegradative conditions, lignin is preferentially degraded because it acts as an effective light-absorbing compound over a wide range of wavelengths. This mechanistic understanding of the role of lignin in plant litter decomposition will allow formoreaccurate predictions of carbon dynamics in terrestrial ecosystems.2010articleinfo:eu-repo/semantics/articlepublishedVersioninfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfdoi:10.1073/pnas.0909396107issn:0027-8424http://ri.agro.uba.ar/greenstone3/library/collection/arti/document/2010AustinProceedings of the National Academy of Sciences of the United States of AmericaVol.107, no.104618-4622http://www.nasonline.org/reponame:FAUBA Digital (UBA-FAUBA)instname:Universidad de Buenos Aires. Facultad de AgronomíaengARGinfo:eu-repo/semantics/openAccessopenAccesshttp://ri.agro.uba.ar/greenstone3/library/page/biblioteca#section42025-09-29T13:41:49Zsnrd:2010Austininstacron:UBA-FAUBAInstitucionalhttp://ri.agro.uba.ar/Universidad públicaNo correspondehttp://ri.agro.uba.ar/greenstone3/oaiserver?verb=ListSetsmartino@agro.uba.ar;berasa@agro.uba.ar ArgentinaNo correspondeNo correspondeNo correspondeopendoar:27292025-09-29 13:41:50.727FAUBA Digital (UBA-FAUBA) - Universidad de Buenos Aires. Facultad de Agronomíafalse
dc.title.none.fl_str_mv Dual role of lignin in plant litter decomposition in terrestrial ecosystems
title Dual role of lignin in plant litter decomposition in terrestrial ecosystems
spellingShingle Dual role of lignin in plant litter decomposition in terrestrial ecosystems
Austin, Amy Theresa
CARBON CYCLE
PHOTODEGRADATION
SEMIARID GRASSLANDS
ULTRAVIOLET RADIATION
CARBON
CELLULOSE
LIGNIN
POLYMER
ABSORPTION SPECTROSCOPY
CARBON DYNAMICS
ECOSYSTEM
GRASS
GRASSLAND
LAND BIOME
LIGHT
NONHUMAN
PLANT LITTER
ARGENTINA
BIODEGRADATION, ENVIRONMENTAL
PLANT LEAVES
PLANTS
POACEAE
SOIL
SPECTROPHOTOMETRY
title_short Dual role of lignin in plant litter decomposition in terrestrial ecosystems
title_full Dual role of lignin in plant litter decomposition in terrestrial ecosystems
title_fullStr Dual role of lignin in plant litter decomposition in terrestrial ecosystems
title_full_unstemmed Dual role of lignin in plant litter decomposition in terrestrial ecosystems
title_sort Dual role of lignin in plant litter decomposition in terrestrial ecosystems
dc.creator.none.fl_str_mv Austin, Amy Theresa
Ballaré, Carlos Luis
author Austin, Amy Theresa
author_facet Austin, Amy Theresa
Ballaré, Carlos Luis
author_role author
author2 Ballaré, Carlos Luis
author2_role author
dc.subject.none.fl_str_mv CARBON CYCLE
PHOTODEGRADATION
SEMIARID GRASSLANDS
ULTRAVIOLET RADIATION
CARBON
CELLULOSE
LIGNIN
POLYMER
ABSORPTION SPECTROSCOPY
CARBON DYNAMICS
ECOSYSTEM
GRASS
GRASSLAND
LAND BIOME
LIGHT
NONHUMAN
PLANT LITTER
ARGENTINA
BIODEGRADATION, ENVIRONMENTAL
PLANT LEAVES
PLANTS
POACEAE
SOIL
SPECTROPHOTOMETRY
topic CARBON CYCLE
PHOTODEGRADATION
SEMIARID GRASSLANDS
ULTRAVIOLET RADIATION
CARBON
CELLULOSE
LIGNIN
POLYMER
ABSORPTION SPECTROSCOPY
CARBON DYNAMICS
ECOSYSTEM
GRASS
GRASSLAND
LAND BIOME
LIGHT
NONHUMAN
PLANT LITTER
ARGENTINA
BIODEGRADATION, ENVIRONMENTAL
PLANT LEAVES
PLANTS
POACEAE
SOIL
SPECTROPHOTOMETRY
dc.description.none.fl_txt_mv Fil: Austin, Amy Theresa. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.
Fil: Austin, Amy Theresa. CONICET – Universidad de Buenos Aires. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.
Fil: Austin, Amy Theresa. Universidad de Buenos Aires. Facultad de Agronomía. Buenos Aires, Argentina.
Fil: Ballaré, Carlos Luis. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.
Fil: Ballaré, Carlos Luis. CONICET – Universidad de Buenos Aires. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.
Fil: Ballaré, Carlos Luis. Universidad de Buenos Aires. Facultad de Agronomía. Buenos Aires, Argentina.
Plant litter decomposition is a critical step in the formation of soil organicmatter, themineralizationoforganic nutrients, andthe carbon balance in terrestrial ecosystems. Biotic decomposition in mesic ecosystems is generally negatively correlated with the concentration of lignin, a group of complex aromatic polymers present in plant cell walls that is recalcitrant to enzymatic degradation and serves as a structural barrier impeding microbial access to labile carbon compounds. Although photochemical mineralization of carbon has recently been shown to be important in semiarid ecosystems, litter chemistry controls on photodegradative losses are not understood. We evaluated the importance of litter chemistry on photodegradation of grass litter and cellulose substrates with varying levels of lignin (cellulose-lignin (CL) substrates) under field conditions. Using wavelength-specific light attenuation filters, we found that light-driven mass loss was promoted by both UV and visible radiation. The spectral dependence of photodegradation correlated with the absorption spectrumof ligninbut not of cellulose. Fieldincubationsdemonstrated that increasing lignin concentration reduced biotic decomposition, as expected, but linearly increased photodegradation. In addition, lignin content in CL substrates consistently decreased in photodegradative incubations. We conclude that lignin has a dual role affecting litter decomposition, depending on the dominant driver (biotic or abiotic) controlling carbon turnover. Under photodegradative conditions, lignin is preferentially degraded because it acts as an effective light-absorbing compound over a wide range of wavelengths. This mechanistic understanding of the role of lignin in plant litter decomposition will allow formoreaccurate predictions of carbon dynamics in terrestrial ecosystems.
description Fil: Austin, Amy Theresa. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.
publishDate 2010
dc.date.none.fl_str_mv 2010
dc.type.none.fl_str_mv article
info:eu-repo/semantics/article
publishedVersion
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv doi:10.1073/pnas.0909396107
issn:0027-8424
http://ri.agro.uba.ar/greenstone3/library/collection/arti/document/2010Austin
identifier_str_mv doi:10.1073/pnas.0909396107
issn:0027-8424
url http://ri.agro.uba.ar/greenstone3/library/collection/arti/document/2010Austin
dc.language.none.fl_str_mv eng
language eng
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
openAccess
http://ri.agro.uba.ar/greenstone3/library/page/biblioteca#section4
eu_rights_str_mv openAccess
rights_invalid_str_mv openAccess
http://ri.agro.uba.ar/greenstone3/library/page/biblioteca#section4
dc.format.none.fl_str_mv application/pdf
dc.coverage.none.fl_str_mv ARG
dc.source.none.fl_str_mv Proceedings of the National Academy of Sciences of the United States of America
Vol.107, no.10
4618-4622
http://www.nasonline.org/
reponame:FAUBA Digital (UBA-FAUBA)
instname:Universidad de Buenos Aires. Facultad de Agronomía
reponame_str FAUBA Digital (UBA-FAUBA)
collection FAUBA Digital (UBA-FAUBA)
instname_str Universidad de Buenos Aires. Facultad de Agronomía
repository.name.fl_str_mv FAUBA Digital (UBA-FAUBA) - Universidad de Buenos Aires. Facultad de Agronomía
repository.mail.fl_str_mv martino@agro.uba.ar;berasa@agro.uba.ar
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score 13.070432