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Brian Westenhaus

Brian Westenhaus

Brian is the editor of the popular energy technology site New Energy and Fuel. The site’s mission is to inform, stimulate, amuse and abuse the…

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Will Bioenergy Ever Be Competitive?

  • New research found that miscanthus and sorghum – both C4 plant species – occupy a distinct niche of the leaf economics spectrum (LES), with greater photosynthetic rates and nitrogen use efficiency than more common C3 plants.
  • The CABBI researchers showed that C4 bioenergy crops have higher photosynthetic rates and greater nitrogen use efficiency.
  • This is the kind of research that can get more renewable raw materials competitive in the fuels marketplace.

A study led by researchers at the Center for Advanced Bioenergy and Bioproducts Innovation (CABBI) improves understanding of leaf functional relationships and provides valuable new information for scientists modeling the productivity of C4 bioenergy crops. The research team found that miscanthus and sorghum – both C4 plant species – occupy a distinct niche of the leaf economics spectrum (LES), with greater photosynthetic rates and nitrogen use efficiency than more common C3 plants.

The study, published in Plant, Cell & Environment, was led by Postdoctoral Researcher Shuai Li of CABBI, a U.S. Department of Energy-funded Bioenergy Research Center. Li works with Lisa Ainsworth, a Plant Physiologist with the U.S. Department of Agriculture’s Agricultural Research Service (USDA-ARS) Global Change and Photosynthesis Research Unit and Adjunct Professor of Plant Biology and the Carl R. Woese Institute of Genomic Biology (IGB) at the University of Illinois Urbana-Champaign.

LES describes relationships among leaf traits reflecting fundamental trade-offs underpinning key ecological strategies for resource acquisition and use in plants. It is largely based on information from C3 species in natural environments and has been studied rarely in C4 crops, which use a different carbon-fixation process: C4 plants convert sunlight energy into 4-carbon molecules, whereas the first photosynthesis product of C3 plants is a 3-carbon molecule. C4 plants make up about 3% of land plant species but include major sources of food and biofuels worldwide, such as maize, sorghum, and miscanthus.

The CABBI researchers showed that C4 bioenergy crops occupy a distinct range of the LES, with higher photosynthetic rates and greater nitrogen use efficiency. Additionally, Miscanthus × giganteus genotypes with different ploidy levels (or number of chromosome pairs) exhibit leaf trait divergence and distinct leaf functional relationships compared to C3 plants.

By expanding the trait relationships described in the LES to include C4 crops in agricultural conditions, the study enhances understanding of overall worldwide patterns in leaf functional relationships and offers insight into the potential for ploidy to improve resource use efficiency, Ainsworth said.

Related: Will Azerbaijan’s New Gas Pipeline Be Enough To Ease Europe’s Energy Crisis?

“This study took advantage of diverse plantings of miscanthus in Illinois and Mississippi to test how leaf properties vary in different lines and in different environments,” Ainsworth said. “We studied the investment that different miscanthus lines make in leaf structure and nutrient content – information that is crucial for modeling productivity of bioenergy crops and where they can be grown.”

***

This is the kind of research that can get more renewable raw materials competitive in the fuels marketplace. The reality that petroleum is still a leading fuel is do to its 150+ year head start and its versatility. Biofuels have a long way to go the get past the simple things like sugar cane and corn becoming ethanol. An advantage is there are immense advantages to liquid biofuels compared to gasses like pure hydrogen.

It's been quite some time since we’ve seen biofuel news, which makes this post especially welcome. Not to be remiss, this research was a fairly large effort, so the names of the participants follow.

By Brian Westenhaus via New Energy And Fuel

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