Don Comis
An Agricultural Research Service (ARS) scientist has developed a special
population of plants of the wild grass Brachypodium distachyon
(Brachypodium) that will help speed up scientists' search for genes that
could help wheat and other major crops resist diseases such as Ug99, a form
of stem rust that threatens 80 percent of the world's wheat.

The plants developed by ARS plant geneticist David Garvin are the first
recombinant inbred line (RILs) population of Brachypodium. This means
offspring of each line in the population will retain the same genetic
identity in perpetuity, according to Garvin, who works at the ARS Plant
Science Research Unit in St. Paul, Minn. This allows scientists to more
efficiently explore the genetic and molecular basis of a range of traits.

Previously, Garvin had developed earlier versions of populations segregating
for genes and traits, but those populations permitted only one look at the
genetics of a given trait. With the new RILs, all the offspring of each line
will always have the same genes, so scientists around the world can repeat
experiments as often as they desire.

The ability to work with large numbers of plants with the same genetic
makeup gives scientists the opportunity to obtain highly accurate
information on the number of genes that control a trait. This provides a
strong start toward identifying the location of these genes on Brachypodium
chromosomes.

It took Garvin more than three years to create the RILs. The research
involved crosses and growing the entire population to maturity repeatedly to
fix the genetic make-up of each plant. He has many additional RIL
populations nearing completion.

ARS is a scientific research agency within the U.S. Department of
Agriculture.

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