…Joint BioEnergy Institute Researchers Engineer Plant Cell Walls to Boost Sugar Yields for Biofuels

[OKIsItJustMe]

http://newscenter.lbl.gov/feature-stories/2013/03/29/making-do-with-more-joint-bioenergy-institute-researchers-engineer-plant-cell-walls-to-boost-sugar-yields-for-biofuels/

[font face=Serif][font size=5]Making Do with More: Joint BioEnergy Institute Researchers Engineer Plant Cell Walls to Boost Sugar Yields for Biofuels[/font]

March 29, 2013
Lynn Yarris [phone] [e-mail]

[font size=3]When blessed with a resource in overwhelming abundance it’s generally a good idea to make valuable use of that resource. Lignocellulosic biomass is the most abundant organic material on Earth. For thousands of years it has been used as animal feed, and for the past two centuries has been a staple of the paper industry. This abundant resource, however, could also supply the sugars needed to produce advanced biofuels that can supplement or replace fossil fuels, providing several key technical challenges are met. One of these challenges is finding ways to more cost-effectively extract those sugars. Major steps towards achieving this breakthrough are being taken by researchers at the U.S. Department of Energy (DOE)’s Joint BioEnergy Institute (JBEI).

“Through the tools of synthetic biology, we have engineered healthy plants whose lignocellulosic biomass can more easily be broken down into simple sugars for biofuels,” says Dominique Loque, who directs the cell wall engineering program for JBEI’s Feedstocks Division. “Working with the model plant, Arabidopsis, as a demonstration tool, we have genetically manipulated secondary cell walls to reduce the production of lignin while increasing the yield of fuel sugars.”

JBEI is a scientific partnership led by Lawrence Berkeley National Laboratory (Berkeley Lab) whose mission is to advance the development of next generation biofuels that can provide the nation with clean, green and renewable transportation energy that will create jobs and boost the economy. Loque and his research group have focused on reducing the natural recalcitrance of plant cell walls to give up their sugars. Unlike the simple starch-based sugars in corn and other grains, the complex polysaccharide sugars in plant cell walls are locked within a robust aromatic polymer called lignin. Setting these sugars free from their lignin cage has required the use of expensive and environmentally harsh chemicals at high temperatures, a process that helps drive production costs of advance biofuels prohibitively high.

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“When we applied our APFL to Arabidopsis plants engineered so that lignin biosynthesis is disconnected from the fiber secondary cell wall regulatory network, we maintained the integrity of the vessels and were able to produce healthy plants with reduced lignin and enhanced polysaccharide deposition in the cell walls,” Loque says. “After various pretreatments, these engineered plants exhibited improved sugar releases from enzymatic hydrolysis as compared to wild type plants. In other words we accumulated the good stuff – polysaccharides – without spoiling it with lignin.”

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[Bill USA]

1. recommended.