Process Management

News last update:6 Aug 2012

New sorghum ideal for both fuel and feed

New, low-lignin sorghum germplasm lines developed by Agricultural Research Service (ARS) and collaborating university scientists are now available for bolstering the grain crop's value as both a livestock feed and ethanol resource.

Lignin is a "cellular glue" of sorts that imparts rigidity and strength to plant tissues. It also helps plants fend off attacking insects and pathogens.

However, studies by ARS scientists Deanna Funnell, Jeff Pedersen and John Toy in Lincoln, Nebraska, show that reducing sorghum's lignin content can also be beneficial.

Take, for example, Atlas bmr-12, one of 20 low-lignin lines the ARS team developed and tested in collaboration with University of Nebraska-Lincoln scientists Richard Grant and Amanda Oliver.

High fibre digestibility
In the laboratory, the line scored higher on fibre digestibility than standard sorghum, which should result in higher milk production and higher beef gains when Atlas bmr-12 is fed to cattle.

On the fuel front, the line's high fibre digestibility could also mean improved sorghum-to-ethanol conversion at processing plants, notes Funnell.

Interestingly, reducing the sorghum line's lignin didn't leave it more vulnerable to fungal attack in laboratory trials.

Funnell determined this by inoculating Atlas bmr-12 and another line, bmr-6, with Fusarium moniliforme fungi and examining the length of red-pigmented lesions that formed as the pathogen spread.

Fungus resistence
Both lines showed greater resistance to the fungus than a control group of standard sorghum that was used. Inside the stems of Atlas bmr-12, for example, fungal lesions were 78 millimeters (mm) long, versus 117 mm in other plants used for comparison in the trials.

Atlas bmr-12 and bmr-6 owe their unique balance of fibre digestibility and disease resistance to two genes for the brown midrib trait, which Pedersen incorporated into the sorghum lines during breeding stages.

Read more about the research in the September 2007 issue of Agricultural Research magazine.

ARS is the US Department of Agriculture's chief scientific research agency.

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