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Genomic spotlight on an underrated grass

Published: Tuesday, June 26, 2012
Last Updated: Tuesday, June 26, 2012
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Prairie cordgrass has received comparatively little attention because, unlike the others, it is not a good forage crop. However, as interest in energy crops and in feedstock production for cellulosic biofuels increases, prairie cordgrass is receiving more attention because it grows well on marginal land

Via Phys.Org™

Prairie cordgrass: Highly underrated

June 26, 2012

When D.K. Lee and Lane Rayburn, faculty members in the crop sciences department at the University of Illinois, talk about prairie cordgrass (Spartina pectinata) they have difficulty containing their enthusiasm. They are among the very few people doing research on this grass as a potential energy crop.

 According to Lee, switchgrass has been studied extensively as a forage crop and a dedicated energy crop. Recently this research has been extended to big bluestem, indiangrass, and other native grasses. Prairie cordgrass has received comparatively little attention because, unlike the others, it is not a good forage crop. "The cow has a preference; this grass is coarse and not good for grazing," Lee said.

However, as interest in energy crops and in feedstock production for cellulosic biofuels increases, prairie cordgrass is receiving more attention because it grows well on marginal land. "It likes environments that are too wet for row crop production." Lee explained.

He and his colleagues in the Energy Biosciences Institute, of which the U of I is a partner, are giving prairie cordgrass this increased attention as a biofuel source plant.

Many conservationists are also interested in the grass. "One of the characteristics of this grass is that it has a strong rhizome and root system," explained Lee. Thus, it is good for erosion control and conservation, particularly in riparian areas because it is a species that likes water.

Another important characteristic of Spartina pectinata is salt tolerance. Lee planted prairie cordgrass in west Texas in fields that could no longer be used for crop production because they had been irrigated with salty ground water. "It actually grew pretty well; the farmer was shocked," he said. Soil salinity is a problem in much of the marginal land throughout the world.

 It also has good cold tolerance. Although it is a warm-season grass, it starts growing in mid-March like a cool-season grass. Its growing season is longer than that of corn, allowing it to accumulate high biomass.

Rayburn said that what makes it perfect as a biomass grass is that it is a native species with no invasiveness issues associated with it. "If I'm going to work with an energy crop, I want to bring something in that, environmentally and ecologically, I don't have to worry about," he said.

"It's a great plant," added Rayburn. "We know how to control it, it gives good biomass, and it grows on marginal land."

Lee and Rayburn wanted to know where the grass grows and whether it was all the same. Lee traveled over 10,000 miles around the country collecting more than 130 natural populations. He and his group then looked at the DNA and the ploidy level, which is the number of sets of chromosomes.


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