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Ethanol yields and cell wall properties in divergently bred switchgrass genotypes
- Abstract::
- Genetic modification of herbaceous plant cell walls to increase biofuels yields is a primary bioenergy research goal. Using two switchgrass populations developed by divergent breeding for ruminant digestibility, the contributions of several wall-related factors to ethanol yields was evaluated. Field grown low lignin plants significantly out yielded high lignin plants for conversion to ethanol by 39.1% and extraction of xylans by 12%. However, across all plants analyzed, greater than 50% of the variation in ethanol yields was attributable to changes in tissue and cell wall architecture, and responses of stem biomass to dilute-acid pretreatment. Although lignin levels were lower in the most efficiently converted genotypes, no apparent correlation were seen in the lignin monomer G/S ratios. Plants with higher ethanol yields were associated with an apparent decrease in the lignification of the cortical sclerenchyma, and a marked decrease in the granularity of the cell walls following dilute-acid pretreatment.
- Author(s):
-
Gautam Sarath , Bruce Dien , Aaron J. Saathoff , Kenneth P. Vogel , Robert B. Mitchell , Han Chen
- Subject(s):
-
Panicum virgatum , acid treatment , biofuels , biomass , cell walls , ethanol , ethanol production , genotype , lignification , lignin , plant breeding , pretreatment , sclerenchyma , stems , xylan
- Source:
- Bioresource technology 2011 October v.102 no.20
- Language:
- English
- Year:
- 2011
- Publisher:
- Elsevier Ltd
- Collection:
-
Journal Articles, USDA Authors, Peer-Reviewed
- File:
-
Download [PDF]
- Rights:
- Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.
