Factors contributing to the recalcitrance of herbaceous dicotyledons (forbs) to enzymatic deconstruction

Biotechnology for Biofuels

Dina Jabbour²  Evan R Angelos²  Achira Mukhopadhyay²  Alec Womboldt²  Melissa S Borrusch²  Jonathan D Walton¹ 

[1] Department of Energy, Plant Research Laboratory, 612 Wilson Road, Michigan State University, East Lansing, MI 48824, USA

[2] Department of Energy, Great Lakes Bioenergy Research Center, 1129 Farm Lane, Michigan State University, East Lansing, MI 48824, USA

关键词: AFEX;    Alkaline hydrogen peroxide;    Pretreatment;    Biofuels;    Cellulase;    Lamb’s quarters;    Queen Anne’s lace;    Goldenrod;    Milkweed;   

Others  :  792812
DOI  :  10.1186/1754-6834-7-52

 received in 2013-10-25, accepted in 2014-03-27,  发布年份 2014

【 摘 要 】

Background

Many different feedstocks are under consideration for the practical production of biofuels from lignocellulosic materials. The best choice under any particular combination of economic, agronomic, and environmental conditions depends on multiple factors. The use of old fields, restored prairie, or marginal lands to grow biofuel feedstocks offers several potential benefits including minimal agronomic inputs, reduced competition with food production, and high biodiversity. However, a major component of such landscapes is often herbaceous dicotyledonous plants, also known as forbs. The potential and obstacles of using forbs as biofuel feedstocks compared to the more frequently considered grasses and woody plants are poorly understood.

Results

The factors that contribute to the yield of fermentable sugars from four representative forbs were studied in comparison with corn stover. The forbs chosen for the study were lamb’s quarters (Chenopodium album), goldenrod (Solidago canadensis), milkweed (Asclepias syriaca), and Queen Anne’s lace (Daucus carota). These plants are taxonomically diverse, widely distributed in northern temperate regions including the continental United States, and are weedy but not invasive. All of the forbs had lower total glucose (Glc) content from all sources (cell walls, sucrose, starch, glucosides, and free Glc) compared to corn stover (range 16.2 to 23.0% on a dry weight basis compared to 39.2% for corn stover). When digested with commercial enzyme mixtures after alkaline pretreatment, yields of Glc as a percentage of total Glc were lower for the forbs compared to corn stover. Enzyme inhibition by water-extractable compounds was not a significant contributor to the lower yields. Based on experiments with optimized cocktails of pure glycosyl hydrolases, enzyme imbalance probably accounted for much of the lower yields. Addition of xyloglucanase and α-xylosidase, two enzymes targeting Glc-containing polysaccharides that are more abundant in dicotyledonous plants compared to grasses, enhanced Glc yields from lamb’s quarters, but Glc yields were still lower than from corn stover.

Conclusion

The potential utilization of forb-rich plant communities as biofuel feedstocks must take into account their lower Glc content compared to grasses such as corn stover. Furthermore, new enzyme mixtures tailored to the different cell wall composition of forbs will have to be developed.

【 授权许可】

   
2014 Jabbour et al.; licensee BioMed Central Ltd.

【 图 表 】

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