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Impacts of Timber Harvesting on Cellulolytic Community of Forest Soils

ABSTRACT: 13C-cellulose stable isotope probing was applied to Californian forest soil from both organic and mineral soils. The data identifies cellulolytic taxa and impacts of three different timber harvesting strategies contrasted to unharvested pristine forest.

PROVIDER: PRJEB9761 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	FJVR01.dat.gz	Other
	FJVR01.fasta.gz	Fasta.gz
	FJVR01.master.dat	Other
	FJVS01.dat.gz	Other
	FJVS01.fasta.gz	Fasta.gz

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Project description:Evidence shows that bacteria contribute actively to the decomposition of cellulose and hemicellulose in forest soil; however, their role in this process is still unclear. Here we performed the screening and identification of bacteria showing potential cellulolytic activity from litter and organic soil of a temperate oak forest. The genomes of three cellulolytic isolates previously described as abundant in this ecosystem were sequenced and their proteomes were characterized during the growth on plant biomass and on microcrystalline cellulose. Pedobacter and Mucilaginibacter showed complex enzymatic systems containing highly diverse carbohydrate-active enzymes for the degradation of cellulose and hemicellulose, which were functionally redundant for endoglucanases, -glucosidases, endoxylanases, -xylosidases, mannosidases and carbohydrate-binding modules. Luteibacter did not express any glycosyl hydrolases traditionally recognized as cellulases. Instead, cellulose decomposition was likely performed by an expressed GH23 family protein containing a cellulose-binding domain. Interestingly, the presence of plant lignocellulose as well as crystalline cellulose both trigger the production of a wide set of hydrolytic proteins including cellulases, hemicellulases and other glycosyl hydrolases. Our findings highlight the extensive and unexplored structural diversity of enzymatic systems in cellulolytic soil bacteria and indicate the roles of multiple abundant bacterial taxa in the decomposition of cellulose and other plant polysaccharides.

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