Professor Simon McQueen-Mason.
Credit: Phil Roberts, University of York
Scientists discover variant plants with straw that is more easily digested for biofuel production
Critically the plants are not significantly smaller or weaker than normal plants
The discovery could make biofuels from plant residues easier and cheaper to make, reducing pressure on food crops used for biofuels
Manufacturing biofuels from food crop by-products such as straw could be made quicker and cheaper thanks to the work of scientists in the UK and France.
Researchers funded by the Biotechnology and Biological Sciences Research Council (BBSRC) have discovered variant straw plants whose cell walls are more easily broken down to make biofuels, but which are not significantly smaller or weaker than regular plants.
The discovery could help ease pressure on global food security as biofuels from non-food crops become easier and cheaper to make.
The impact of carbon emissions on global warming is driving the need for carbon neutral biofuels. Many existing biofuels are produced from crops which can be used for food, and therefore have a negative impact on global food security.
One answer is to make fuels from woody, non-food parts of plants such as straw. These are rich in polysaccharides (sugar chains) which can be broken down into simple sugars and then fermented into ethanol for fuel. However, such biofuels are currently too expensive because of the cost of digesting the woody tissues into simple sugars.
Researchers in the Centre for Novel Agricultural Products at the University of York led by Professor Simon McQueen-Mason, working with colleagues in France, screened a large collection of variants of the model grass species Brachypodiumfor digestibility. Screening variants in this way allows rapid assessment of the range of natural diversity that can be found in a species.
Using this approach, PhD student Poppy Marriott identified 12 independent plant lines with highly digestible straw, but which grew normally and showed no decrease in straw strength. Analysing these plants showed that increased digestibility can be achieved through a range of changes in the cell wall, where the majority of sugar is contained in woody biomass.
In addition the team at York also showed they can identify the gene alterations that give rise to the high digestibility. The new results are published in the latest edition of the Proceedings of the National Academy of Sciences USA.
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