Molecular evidence for lignin degradation in sulfate-reducing mangrove sediments (Amazônia, Brazil)

Dittmar, Thorsten; Lara, Rubén

doi:10.1016/s0016-7037(00)00619-0

Cited by 197 publications

(134 citation statements)

References 37 publications

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“…3d, 9). Although elevated 3,5-Bd : V is a general indicator of humified SOM sorbed on fine particles (Prahl et al 1994;Louchouarn et al 1999;Farella et al 2001), an increase in the P : (VϩS) ratio marks a specific lignin degradation pathway (brown-rot), leading to demethylation of methoxylated vanillyl and syringyl constituents (Dittmar and Lara 2001). A caveat to these interpretations, however, is that both 3,5-Bd and P compounds are not exclusive biomarkers of vascular plant tissues (Hedges et al 1988;Goni and Hedges 1995), thus potentially impacting the above-mentioned ratios in sediments receiving substantial inputs of kelps and brown macroalgae (3,5-Bd) and plankton-derived amino acids (P).…”

Section: Discussionmentioning

confidence: 99%

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Translocation of soil organic matter following reservoir impoundment in boreal systems: Implications for in situ productivity

et al. 2006

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To evaluate the effect of reservoir flooding on carbon cycling over time, we studied sedimentary environments in three natural lakes that existed prior to impoundment and that have been incorporated in the larger lentic system of a 70-yr-old boreal reservoir in Quebec. Elemental and biomarker analyses were determined in all core intervals and three soil profiles to characterize source inputs of organic matter to sediments. Following impoundment, a twoto threefold increase in lignin concentrations (5 to 10-25 mg [10 g dry wt]Ϫ1 ) associated with similar decreases in selected terrigenous biomarker ratios (cinnamyl phenols : vanillyl phenols, C : V, 1.0-2.0 to 0.2-0.5; 3,5-dihydroxybenzoic acid : vanillyl phenols, 3,5-Bd : V, 0.2-0.5 to 0.1-0.2; and p-hydroxyl phenols : sum of vanillyl and syringyl phenols, P : [VϩS], 0.3-0.7 to 0.1-0.4) illustrate the effect of soil erosion and subsequent translocation of surface soil organic matter (SOM) to sedimentary deposits. Using a mixing model based on mass-normalized biomarker yields in identified surface and mineral soil end-members, we show that although the proportion of mineral-derived SOM predominates in the receiving sedimentary systems during preflooding conditions (97-99% of allochthonous inputs), translocated surface SOM increased in postflooding sediments to comprise up to 5-30% of the total allochthonous organic matter inputs. Using a similar quantitative mixing model based on elemental C and N contents in the autochthonous and the mixed allochthonous end-members, we estimated that concomitant to the redistribution of eroded soil organic matter, reservoir flooding induces a 1.5-to 2-fold increase in the fraction of autochthonous organic matter transferred to sedimentary environments of the reservoir. Results presented here suggest that reservoir flooding induces a change of state in lake systems that may perdure over time scales of decades to centuries.

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Section: Discussionmentioning

confidence: 99%

“…9). Indeed, p-hydroxyacetophenone is derived exclusively from lignin constituents (Hedges et al 1988), and constant Pn : P ratios in sedimentary systems have been used to verify lignin sources for this phenol family (Dittmar and Lara 2001).…”

Section: Discussionmentioning

confidence: 99%

Translocation of soil organic matter following reservoir impoundment in boreal systems: Implications for in situ productivity

et al. 2006

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“…Hedges and Mann, 1979;Hedges et al, 1986;Louchoarn et al, 1997;Dittmar and Lara, 2001;Tareq et al, 2004). Hedges et al (1986) delineated areas corresponding to fresh plant material (leaves and wood) from the Amazonian basin.…”

Section: Terrigenous Origin Of Om In Recent Floodplain Lakesmentioning

confidence: 99%

Sedimentary evidence of soil organic matter input to the Curuai Amazonian floodplain

Zocatelli

Bernardes

Turcq

et al. 2013

Organic Geochemistry

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A multi-proxy study has been performed on a sediment core from the Curuai floodplain, Central Amazonia. The combination of elemental, isotopic and molecular analysis of a 110 cm core (a record of ca. the last 100 yr) allowed reconstruction of the hydrological conditions of organic matter (OM) deposition. Two units could be delineated. The first (UI) was composed of three sub-units: UIa (0-15 cm), composed of highly degraded organic particles originating from the surrounding soil and indicative of restricted transport; UIb (15-48 cm), during which the region was permanently flooded and the material stored came from soil runoff, mainly from alluvial forest; and UIc (48-88 cm) composed of material from Amazon River suspended sediment, itself originating from OM degradation in forest soil. In UII (88-111 cm), the OM originated mainly from the forest soil and other plant remains in the floodplain. The data reveal that, during the four distinct depositional periods, the sedimentary OM alternated between land derived soil and alluvial vegetation due to changes in hydrodynamics.

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“…Aromatic rings cleavage is the main mechanism to degrade the lignin in sulfatereducing sediments (Dittmar and Lara 2001). Lignin degradation by anaerobic fungi from rumen of herbivorous resulted in a breakdown of esterand eter-linkages from phenolic units forming phenolic acids with no degradation of the most abundant linkages between lignin and wood polysaccharides (McSweeney et al, 1994).…”

Section: Resultsmentioning

confidence: 99%

Degradation of lignosulfonic and tannic acids by ligninolytic soil fungi cultivated under icroaerobic conditions

Silva

Menezes

Franciscon

et al. 2010

Braz. arch. biol. technol.

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Soil fungi were evaluated regarding their ability to degrade lignin-related compounds by producing the ligninolytic enzymes. Lignosulfonic and tannic acids were used as sole carbon sources during 30 days under microaerobic and very-low-oxygen conditions. The fungi produced lignin-peroxidase, manganese-peroxidase and laccase. Expressive degradations was observed by C 18 reversed-phase HPLC, indicating the biodegradation potential of these fungi,showing more advantages than obligate anaerobes to decontaminate the environment when present naturally.

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Molecular evidence for lignin degradation in sulfate-reducing mangrove sediments (Amazônia, Brazil)

Cited by 197 publications

References 37 publications

Translocation of soil organic matter following reservoir impoundment in boreal systems: Implications for in situ productivity

Translocation of soil organic matter following reservoir impoundment in boreal systems: Implications for in situ productivity

Sedimentary evidence of soil organic matter input to the Curuai Amazonian floodplain

Degradation of lignosulfonic and tannic acids by ligninolytic soil fungi cultivated under icroaerobic conditions

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