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http://dx.doi.org/10.1007/s11816-010-0159-7

Biotechnological improvement of lignocellulosic feedstock for enhanced biofuel productivity and processing  

Ko, Jae-Heung (Department of Plant and Environmental New Resources, Kyung Hee University)
Kim, Hyun-Tae (Department of Horticulture, Michigan State University)
Han, Kyung-Hwan (Department of Horticulture, Michigan State University)
Publication Information
Plant Biotechnology Reports / v.5, no.1, 2011 , pp. 1-7 More about this Journal
Abstract
Secondary walls have recently drawn research interest as a primary source of sugars for liquid biofuel production. Secondary walls are composed of a complex mixture of the structural polymers cellulose, hemicellulose, and lignin. A matrix of hemicellulose and lignin surrounds the cellulose component of the plant's cell wall in order to protect the cell from enzymatic attacks. Such resistance, along with the variability seen in the proportions of the major components of the mixture, presents process design and operating challenges to the bioconversion of lignocellulosic biomass to fuel. Expanding bioenergy production to the commercial scale will require a significant improvement in the growth of feedstock as well as in its quality. Plant biotechnology offers an efficient means to create "targeted" changes in the chemical and physical properties of the resulting biomass through pathway-specific manipulation of metabolisms. The successful use of the genetic engineering approach largely depends on the development of two enabling tools: (1) the discovery of regulatory genes involved in key pathways that determine the quantity and quality of the biomass, and (2) utility promoters that can drive the expression of the introduced genes in a highly controlled manner spatially and/or temporally. In this review, we summarize the current understanding of the transcriptional regulatory network that controls secondary wall biosynthesis and discuss experimental approaches to developing-xylem-specific utility promoters.
Keywords
Secondary wall; Biomass feedstock; Biofuel; Transcriptional regulator; Utility promoter;
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